Nellcor NPB-290 - Service Manual

Caution: Federal law (U.S.A.) restricts this device to sale by or on the order of a physician. To contact Mallinckrodt's representative: In the United States, call 1.800.635.5267 or 314.654.2000; outside of the United States, call your local Mallinckrodt representative.

SERVICE MANUAL NPB-290 Pulse Oximeter

© 2002 Mallinckrodt Inc. All rights reserved. 061096D-1102

Nellcor Puritan Bennett Inc. 4280 Hacienda Drive Pleasanton, CA 94588 USA Telephone Toll Free 1.800.NELLCOR Mallinckrodt Europe BV Hambakenwetering 1 5231 DD”s-Hertogenbosch The Netherlands Telephone +31.73.648.5200

Nellcor Puritan Bennett is a wholly owned subsidiary of Mallinckrodt Inc. Nellcor, Nellcor Puritan Bennett, Oxinet II, Oxisensor II, and Durasensor are trademarks of Mallinckrodt Inc.

To obtain information about a warranty, if any, for this product, contact Mallinckrodt Technical Services Department, or your local Mallinckrodt representative.

Notice: Purchase of this instrument confers no express or implied license under any Mallinckrodt patent to use the instrument with any sensor that is not manufactured or licensed by Mallinckrodt.

Covered by one or more of the following U.S. Patents and foreign equivalents: 4,621,643; 4,653,498; 4,700,708; 4,770,179; 4,869,254; 5,078,136; 5,351,685; 5,368,026; 5,533,507; and 5,662,106.

TABLE OF CONTENTS List of Figures List of Tables

Table of Contents......................................................................................... iii List of Figures .......................................................................................... v List of Tables ........................................................................................... vi

Section 1: Introduction............................................................................... 2-1 1.1 Manual Overview........................................................................... 2-1 1.2 NPB-290 Pulse Oximeter Description ........................................... 2-1 1.3 Related Documents ....................................................................... 2-2

Section 2: Routine Maintenance ............................................................... 2-1 2.1 Cleaning......................................................................................... 2-1 2.2 Periodic Safety and Functional Checks......................................... 2-1 2.3 Battery............................................................................................ 2-1

Section 3: Performance Verification ......................................................... 3-1 3.1 Introduction .................................................................................... 3-1 3.2 Equipment Needed........................................................................ 3-1 3.3 Performance Tests ........................................................................ 3-1 3.4 Safety Tests................................................................................... 3-10

Section 4: Audible Alarm Settings and Service Menu ............................ 4-1 4.1 Introduction .................................................................................... 4-1 4.2 Audible Alarm Settings .................................................................. 4-1 4.3 Operator's Menu Options............................................................... 4-2 4.4 Service Menu Options ................................................................... 4-4

Section 5: Troubleshooting ....................................................................... 5-1 5.1 Introduction .................................................................................... 5-1 5.2 How to Use this Section ................................................................ 5-1 5.3 Who Should Perform Repairs........................................................ 5-1 5.4 Replacement Level Supported ...................................................... 5-1 5.5 Obtaining Replacement Parts........................................................ 5-1 5.6 Troubleshooting Guide .................................................................. 5-2 5.7 Error Codes ................................................................................... 5-8

Section 6: Disassembly Guide................................................................... 6-1 6.1 Introduction .................................................................................... 6-1 6.2 Prior to Disassembly...................................................................... 6-1 6.3 Fuse Replacement ........................................................................ 6-2 6.4 Monitor Disassembly ..................................................................... 6-3 6.5 Monitor Reassembly...................................................................... 6-4 6.6 Battery Replacement ..................................................................... 6-5 6.7 Power Entry Module (PEM) Removal/Replacement ..................... 6-6 6.8 Power Supply Removal/Replacement........................................... 6-7 6.9 Cooling Fan Removal/Replacement.............................................. 6-9 6.10 Display PCB Removal/Replacement............................................. 6-10 6.11 User Interface PCB Removal/Replacement .................................. 6-11 6.12 Alarm Speaker Removal/Replacement ......................................... 6-12

Section 7: Spare Parts................................................................................ 7-1 7.1 Introduction .................................................................................... 7-1

iii

Table of Contents

Section 8: Packing for Shipment............................................................... 8-1 8.1 General Instructions ...................................................................... 8-1 8.2 Repacking in Original Carton......................................................... 8-1 8.3 Repacking in a Different Carton .................................................... 8-3

Section 9: Specifications ........................................................................... 9-1 9.1 General .......................................................................................... 9-1 9.2 Electrical ........................................................................................ 9-1 9.3 Physical Characteristics ................................................................ 9-1 9.4 Environmental................................................................................ 9-1 9.5 Alarms............................................................................................ 9-2 9.6 Factory Default Settings ................................................................ 9-2 9.7 Performance .................................................................................. 9-2

Section 10: Data Port Interface Protocol.................................................. 10-1 10.1 Introduction .................................................................................... 10-1 10.2 Enabling the Data Port .................................................................. 10-1 10.3 Connecting to the Data Port .......................................................... 10-2 10.4 Real-Time Printout......................................................................... 10-3 10.5 Nurse Call ...................................................................................... 10-6 10.6 Analog Output................................................................................ 10-7 10.7 Interactive Mode ............................................................................ 10-7

Section 11: Technical Supplement ........................................................... 11-1 11.1 Introduction .................................................................................... 11-1 11.2 Oximetry Overview ........................................................................ 11-1 11.3 Circuit Analysis .............................................................................. 11-2 11.4 Functional Overview ...................................................................... 11-2 11.5 AC Input......................................................................................... 11-3 11.6 Power Supply PCB Theory Of Operation ...................................... 11-3 11.7 Battery............................................................................................ 11-4 11.8 User Interface PCB........................................................................ 11-5 11.9 Front Panel Display PCB and Controls ......................................... 11-8 11.10 Schematic Diagrams ..................................................................... 11-9

Section 12: Index ........................................................................................ 12-1

iv

Table of Contents

LIST OF FIGURES Figure 1-1: NPB-290 Front Panel ................................................................. 2-1 Figure 1-2: NPB-290 Rear Panel.................................................................. 2-2 Figure 3-1: NPB-290 Controls ...................................................................... 3-2 Figure 3-2: Power-On Self-Test Display....................................................... 3-3 Figure 3-3: Adjusting High %SpO2 Alarm Limit............................................ 3-4 Figure 3-4: Adjusting Low %SpO2 Alarm Limit ............................................ 3-4 Figure 3-5: Adjusting High Pulse Rate Alarm Limit ...................................... 3-4 Figure 3-6: Adjusting Low Pulse Rate Alarm Limit ....................................... 3-4 Figure 3-7: Alarm Silence Duration............................................................... 3-6 Figure 3-8: Alarm Volume Display ................................................................ 3-7 Figure 4-1: NPB-290 Controls ...................................................................... 4-1 Figure 6-1: Fuse Removal ............................................................................ 6-2 Figure 6-2: NPB-290 Corner Screws............................................................ 6-3 Figure 6-3: Separating Case Halves............................................................. 6-4 Figure 6-4: Battery Removal ......................................................................... 6-5 Figure 6-5: Power Entry Module ................................................................... 6-6 Figure 6-6: Power Supply ............................................................................. 6-7 Figure 6-7: Cooling Fan ................................................................................ 6-9 Figure 6-8: Display PCB ............................................................................... 6-10 Figure 6-9: User Interface PCB .................................................................... 6-11 Figure 6-10: Alarm Speaker.......................................................................... 6-13 Figure 7-1: NPB-290 Exploded View ............................................................ 7-2 Figure 8-1: Repacking the NPB-290............................................................. 8-2 Figure 10-1: Data Port Pin Layout ................................................................ 10-2 Figure 10-2: Real-Time Printout ................................................................... 10-3 Figure 10-3: Instrument Info Printout ............................................................ 10-9 Figure 10-4: Trend Printout........................................................................... 10-10 Figure 10-5: Error Log Printout ..................................................................... 10-10 Figure 11-1: Oxyhemoglobin Dissociation Curve ......................................... 11-2 Figure 11-2: NPB-290 Functional Block Diagram......................................... 11-3 Figure 11-3: User Interface PCB Front End Red/IR Schematic Diagram .... 11-9 Figure 11-4: Front End LED Drive Schematic Diagram................................ 11-9 Figure 11-5: Front End Power Supply Schematic Diagram.......................... 11-9 Figure 11-6: SIP/SOP Isolation Barrier Schematic Diagram ........................ 11-9 Figure 11-7: Data Port Drivers and Analog Output Schematic Diagram...... 11-9 Figure 11-8: User Interface PCB MC331 Core Schematic Diagram ............ 11-9 Figure 11-9: User Interface PCB MC331 Memory Schematic Diagram B ... 11-9 Figure 11-10: Speaker Driver Schematic Diagram A ................................... 11-9 Figure 11-11: User Interface PCB Power Supply Schematic Diagram B..... 11-9 Figure 11-12: Display Interface Schematic Diagram.................................... 11-9 Figure 11-13: Parts Locator Diagram for USER INTERFACE PCB............. 11-9 Figure 11-14: Power Supply Schematic Diagram......................................... 11-9 Figure 11-15: Power Supply Parts Locator Diagram.................................... 11-9 Figure 11-16: Display PCB Schematic Diagram........................................... 11-9 Figure 11-17: Display PCB Parts Locator Diagram...................................... 11-9

v

Table of Contents

LIST OF TABLES Table 3-1: Dynamic Operating Range .......................................................... 3-8 Table 3-2: Earth Leakage Current Limits...................................................... 3-11 Table 3-3: Enclosure Leakage Current Limits .............................................. 3-11 Table 3-4: Patient Leakage Current Limits ................................................... 3-12 Table 3-5: Patient Leakage Current Test Configurations -

Mains Voltage on the Applied Part ............................................. 3-13 Table 4-1: Language Selection..................................................................... 4-3 Table 4-2: Factory Default Settings .............................................................. 4-5 Table 5-1: Problem Categories..................................................................... 5-2 Table 5-2: Power Problems .......................................................................... 5-3 Table 5-3: Button Problems .......................................................................... 5-4 Table 5-4: Display/Alarms Problems ............................................................ 5-5 Table 5-5: Operational Performance Problems ............................................ 5-6 Table 5-6: Data Port Problems ..................................................................... 5-7 Table 5-7: Error Codes ................................................................................. 5-8 Table 6-1: Power Supply Leads Connections .............................................. 6-8 Table 7-1: Parts List...................................................................................... 7-1 Table 9-1: Default Settings ........................................................................... 9-2 Table 10-1 Data Port Pin Outs...................................................................... 10-2 Table 10-2: Status Codes ............................................................................. 10-6 Table 10-3: Nurse Call Relay Pin States ...................................................... 10-7 Table 10-4: Rating of Nurse Call Relay ........................................................ 10-7

vi

SECTION 1: INTRODUCTION 1.1 Manual Overview 1.2 NPB-290 Pulse Oximeter Description 1.3 Related Documents

1.1 MANUAL OVERVIEW

This manual contains information for servicing the NPB-290 pulse oximeter. Only qualified service personnel should service this product. Before servicing the NPB-290, read the operator's manual carefully for a thorough understanding of how to operate the NPB-290.

Warning: Explosion hazard. Do not use the NPB-290 pulse oximeter in the presence of flammable anesthetics.

1.2 NPB-290 PULSE OXIMETER DESCRIPTION

The Nellcor NPB-290 pulse oximeter is intended for continuous, noninvasive monitoring of functional oxygen saturation of arterial hemoglobin (SpO2), and pulse rate (measured by SpO2 sensor).

The monitor is intended for use on adult, pediatric, and neonatal patients in all hospital areas, hospital-type facilities, and in the home environment. It may be used during intra-hospital transport when powered by its internal battery.

Digital displays are provided for oxygen saturation and pulse rate, and a 10- segment light-emitting diode (LED) bar indicates pulse amplitude. The NPB-290 can operate on AC or rechargeable internal battery power. The controls and indicators for the NPB-290 are illustrated in Figure 1-1 and Figure 1-2.

NPB-290

1. SpO2 Sensor Port 9. Alarm Silence Button 2. Power On/Off Button 10. Adjust Up Button 3. Low Battery Indicator 11. Adjust Down Button 4. AC Power Indicator 12. Pulse Search Indicator 5. %SpO2 Display 13. Motion Indicator 6. Pulse Amplitude Indicator 14. Lower Alarm Limit Button 7. Pulse Rate Display 15. Upper Alarm Limit Button 8. Alarm Silence Indicator 16. Speaker

Figure 1-1: NPB-290 Front Panel

1-1

Section 1: Introduction

U.S. PATENTS: 4,621,643; 4,653,498; 4,700,708; 4,770,179; 4,869,254; 4,911,167; 4,928,692; 4,934,372; 5,078,136 0123

IPX1R

NRTL/C

NPB-290

T 0.50A 250V

2X

NELLCOR PURITAN BENNETT EUROPE BV,'s-HERTOGENBOSCH, THE NETHERLANDS

035285X-1296

NELLCOR PURITAN BENNETT, INC.PLEASANTON, CA 94588, U.S.A.

MADE IN U.S.A.

SN

100-120 V 200-240 V50/60 Hz 20VA

1. Equipotential Terminal 4. Fuse Drawer 2. AC Connector 5. Supply Voltage Selector Switch 3. Data Port

Figure 1-2: NPB-290 Rear Panel

1.3 RELATED DOCUMENTS

To perform test and troubleshooting procedures and to understand the principles of operation and circuit analysis sections of this manual, you must know how to operate the monitor. Refer to the NPB-290 operator's manual. To understand the various Nellcor sensors that work with the monitor, refer to directions for use for individual sensors.

1-2

SECTION 2: ROUTINE MAINTENANCE 2.1 Cleaning 2.2 Periodic Safety and Functional Checks 2.3 Battery

2.1 CLEANING

Caution: Do not immerse the NPB-290 or its accessories in liquid or clean with caustic or abrasive cleaners. Do not spray or pour any liquid on the monitor or its accessories.

To clean the NPB-290, dampen a cloth with a commercial, nonabrasive cleaner and wipe the exterior surfaces lightly. Do not allow any liquids to come in contact with the power connector, fuse holder, or switches. Do not allow any liquids to penetrate connectors or openings in the instrument cover. Wipe sensor cables with a damp cloth. For sensors, follow the individual directions for use.

2.2 PERIODIC SAFETY AND FUNCTIONAL CHECKS

The NBP-290 requires no calibration.

The battery should be replaced at least every 24 months (paragraph 6.6).

The following checks should be performed at least every 24 months by a qualified service technician.

2.2.1 Periodic Safety Checks

1. Inspect the equipment for mechanical and functional damage.

2. Inspect safety labels for legibility. If the labels are not legible, contact Mallinckrodt Technical Services Department or your local Mallinckrodt representative.

2.2.2 Functional Checks

If the monitor has been visibly damaged or subjected to mechanical shock (for example, if dropped), perform the performance tests, refer to paragraph 3.3.

The following checks should be performed at least every 2 years by a qualified service technician.

1. Perform the electrical safety tests detailed in paragraph 3.4. If the unit fails these electrical safety tests, refer to Section 6, Troubleshooting.

2. Inspect the fuses for proper value and rating (F1 & F2 = 0.5 amp, 250 volts).

2.3 BATTERY

Mallinckrodt recommends replacing the instrument battery every 2 years. When the NPB-290 is going to be stored for 2 months or more, remove the battery. To replace or remove the battery, refer to Section 6, Disassembly Guide.

2-1

Section 2: Routine Maintenance

If the NPB-290 has been stored for more than 30 days, charge the battery as described in paragraph 3.3.1. A fully discharged battery requires 14 hours to receive a full charge when the NPB-290 is in the standby mode and 18 hours if the NPB-290 is in use. The battery is being charged anytime that the instrument is plugged into AC power.

2-2

SECTION 3: PERFORMANCE VERIFICATION 3.1 Introduction 3.2 Equipment Needed 3.3 Performance Tests 3.4 Safety Tests

3.1 INTRODUCTION

This section discusses the tests used to verify NPB-290 performance following repairs or during routine maintenance. All tests can be performed without removing the NPB-290 cover.

If the NPB-290 fails to perform as specified in any test, repairs must be made to correct the problem before the monitor is returned to the user.

3.2 EQUIPMENT NEEDED

Equipment Description

Digital multimeter (DMM) Fluke Model 87 or equivalent

Durasensor® oxygen transducer DS-100A

Oxisensor® II oxygen transducer D-25

Pulse oximeter tester SRC-2 Safety analyzer Must meet current AAMI ES1/1993 &

IEC 601-1/1998 specifications Sensor extension cable SCP-10 or MC-10 Serial interface cable Refer to paragraph 10.3 Stopwatch Manual or electronic

3.3 PERFORMANCE TESTS

The battery should be charged before the monitor is repaired whenever possible.

Note: This section is written using Mallinckrodt factory-set defaults. If your institution has pre-configured custom defaults, those values will be displayed. Factory defaults can be reset using the configuration procedure described in paragraph 4.4.5.

3.3.1 Battery Charge

Perform the following procedure to fully charge the battery.

1. Connect the monitor to an AC power source.

2. Verify that the monitor is off and that the AC Power/Battery Charging indicator is lit.

3. Charge the battery for at least 14 hours.

3-1

Section 3: Performance Verification

3.3.2 Performance Tests

The power-up performance tests (3.3.2.1 and 3.3.2.2) verify the following monitor functions:

• 3.3.2.1 Power-On Self-Test • 3.3.2.2 Factory Power-On Defaults and Alarm Limit Ranges

NPB-290

Figure 3-1: NPB-290 Controls

3.3.2.1 Power-On Self-Test (POST)

Note: See Figure 3-1 for the location of the NPB-290 controls.

1. Connect the monitor to an AC power source. Verify the AC Power/Battery Charging indicator is lit.

2. Do not connect any input cables to the monitor.

3. Observe the front panel of the monitor. With the monitor off, press the Power On/Off button. Verify that the monitor performs the following sequence:

a. Red "8.8.8." is displayed in both windows for a few seconds and the 10-segment blip bar is completely illuminated in green. Only the AC Power Indicator is illuminated.

3-2


NPB-290

Figure 3-2: Power-On Self-Test Display

b. The "8.8.8." displayed in both windows turns green, the 10-segment blip bar is completely illuminated in green, and all LEDs are illuminated as shown in Figure 3-2.

c. The software version is displayed and all LEDs are illuminated.

d. A 1-second POST beep sounds, 3 dashes are displayed in each window, and all LEDs are off except the AC Power LED.

Note: When a sensor is connected, a zero is displayed in each window, a 1-second Power-On Self-Test (POST) beep sounds and the Pulse Search LED is illuminated along with the AC Power/Battery Charging LED.

e. The NPB-290 begins normal operation if a sensor is connected. Without a sensor, the monitor will display 3 dashes in each window.

3.3.2.2 Factory Power-On Defaults and Alarm Limit Ranges

Note: See Figure 3-1 for the location of the NPB-290 controls.

Note: When observing or changing default limits, a 3-second timeout is in effect, that is, if no action is taken within 3 seconds, the monitor automatically returns to the normal mode.

1. Turn the monitor on by pressing the Power On/Off button.

a. Wait for POST to be completed.

b. Press and release the Upper Alarm Limit button.

c. Verify that the monitor emits a single beep and the %SpO2 display indicates a high alarm limit of "100" for about 3 seconds.

d. Verify that three dashes are displayed at the top of the pulse rate display. See Figure 3-3.

Note: The location of the three dashes indicates the type of alarm limit that is being adjusted. Three dashes in the top of the display window indicate a high alarm limit and three dashes in the bottom of the display window indicate a low alarm limit.

3-3


Figure 3-3: Adjusting High %SpO2 Alarm Limit

2. Press the Upper Alarm Limit button. Within 3 seconds press and hold the Adjust Down button. Verify the %SpO2 display reduces to a minimum of "85."

Note: A decimal point to the right of the value in either display indicates that the alarm limits are not power-on default values.

3. Press the Lower Alarm Limit button. Verify that the monitor emits a single beep and that the %SpO2 display indicates an alarm limit of "85" for 3 seconds. Verify that three dashes are displayed at the bottom of the pulse rate display. See Figure 3-4.

Figure 3-4: Adjusting Low %SpO2 Alarm Limit

4. Press the Lower Alarm Limit button. Within 3 seconds press and hold the Adjust Down button and verify that the %SpO2 display reduces to a minimum of "20." Press and hold the Adjust Up button and verify that the %SpO2 display cannot be raised past the upper alarm limit setting of "85."

5. Press the Upper Alarm Limit button two times rapidly (twice within 3 seconds). Verify that the monitor emits two beeps, the pulse rate display indicates an alarm limit of "170," and that the %SpO2 display window shows three dashes at the top for about 3 seconds. See Figure 3-5.

Figure 3-5: Adjusting High Pulse Rate Alarm Limit

6. Press the Upper Alarm Limit button two times rapidly. Within 3 seconds press and hold the Adjust Down button. Verify that the pulse rate display reduces to a minimum of "40." See Figure 3-6.

7. Press the Lower Alarm Limit button two times rapidly. Verify that the pulse rate display indicates an alarm limit of "40" and that the %SpO2 display shows three dashes at the bottom for 3 seconds.

Figure 3-6: Adjusting Low Pulse Rate Alarm Limit

3-4


8. Press the Lower Alarm Limit button two times rapidly. Within 3 seconds press and hold the Adjust Down button. Verify that the pulse rate display reduces to a minimum of "30."

9. Press the Lower Alarm Limit button two times rapidly. Within 3 seconds press and hold the Adjust Up button. Verify that the pulse rate display cannot be adjusted above "40."

10. Press the Power On/Off button to turn the unit off. Turn the unit back on.

11. Press and release the Upper Alarm Limit button. Verify that the %SpO2 display indicates an alarm limit of "100."

12. Press and release the Lower Alarm Limit button. Verify that the %SpO2 display indicates an alarm limit of "85."

13. Press the Upper Alarm Limit button two times rapidly. Verify that the pulse rate display indicates an alarm limit of "170."

14. Press the Lower Alarm Limit button two times rapidly. Verify that the pulse rate display indicates an alarm limit of "40."

15. Press the Power On/Off button to turn the monitor off.

3.3.3 Hardware and Software Tests

Hardware and software testing includes the following tests:

• 3.3.3.1 Operation with a Pulse Oximeter Tester • 3.3.3.2 General Operation

3.3.3.1 Operation with a Pulse Oximeter Tester

Operation with an SRC-2 pulse oximeter tester includes the following tests:

• 3.3.3.1.1 Alarms and Alarm Silence • 3.3.3.1.2 Alarm Volume Control • 3.3.3.1.3 Pulse Tone Volume Control • 3.3.3.1.4 Dynamic Operating Range • 3.3.3.1.5 Nurse Call • 3.3.3.1.6 Analog Output • 3.3.3.1.7 Operation on Battery Power

3.3.3.1.1 Alarms and Alarm Silence

1. Connect the SRC-2 pulse oximeter tester to the sensor-input cable and connect the cable to the monitor. Refer to SRC-2 Operator's manual. Set the SRC-2 switches as follows:

SWITCH POSITION RATE 38 LIGHT HIGH 1 MODULATION OFF RCAL/MODE RCAL 63/LOCAL

3-5


2. Press the Power On/Off button to turn the monitor on. After the normal power-up sequence, verify that the pulse rate initially indicates zeroes.

Note: The pulse amplitude indicator may occasionally indicate a step change as the monitor is in the pulse search mode.

3. Set the modulation switch on the SRC-2 to HIGH.

4. Verify that the following monitor reactions:

a. The pulse amplitude indicator begins to track the artificial pulse signal from the SRC-2.

b. The pulse tone is heard.

c. Zeroes are displayed in the %SpO2 and pulse rate displays.

d. After about 10 to 20 seconds, the monitor displays oxygen saturation and pulse rate as specified by the tester. Verify that the values are within the following tolerances:

• Oxygen saturation range 79% to 83% • Pulse rate range 37 to 39 bpm

e. The audible alarm sounds and both the %SpO2 and pulse rate displays flash the values in red. This is an indication that both parameters have violated the default alarm limits.

5. Press and hold the Alarm Silence button located on the front of the monitor for less than 3 seconds. Verify that the pulse rate display indicates "SEC" and the %SpO2 display indicates "60" while the Alarm Silence button is pressed. The alarm is silenced when the button is released. See Figure 3-7.

Figure 3-7: Alarm Silence Duration

6. Release the Alarm Silence button. Verify the following:

a. The alarm remains silenced.

b. The Alarm Silence indicator lights.

c. The %SpO2 and pulse rate displays resume flashing.

d. The pulse tone is still audible.

e. The audible alarm returns after approximately 60 seconds.

7. While pressing the Alarm Silence button, press the Adjust Down button until the %SpO2 display indicates "30."

8. Press the Adjust Up button and verify that the displays indicate 60 SEC, 90 SEC, 120 SEC, and OFF. Release the button when the display indicates "OFF."

9. Press the Alarm Silence button again and verify that the Alarm Silence indicator flashes.

3-6


10. Wait approximately 3 minutes. Verify that the alarm does not return.

11. After 3 minutes ± 10 seconds, the alarm silence reminder beeps three times, and continues to do so at 3-minute intervals.

3.3.3.1.2 Alarm Volume Control

After completing the procedure in paragraph 3.3.3.1.1:

1. Press and hold the Alarm Silence button for more than 3 seconds. Verify the following:

a. "OFF" is displayed for approximately 3 seconds.

b. After 3 seconds:

• a steady tone is heard at the default alarm volume setting • the %SpO2 display indicates "VOL." See Figure 3-8. • the pulse rate display indicates the default setting of 5.

Figure 3-8: Alarm Volume Display

2. Press the Adjust Down button until an alarm volume setting of 1 is displayed. Verify that the volume of the alarm has decreased but is still audible.

3. Press the Adjust Up button to increase the alarm volume setting to a maximum value of 10. Verify that the volume increases.

4. Press the Adjust Down button until a comfortable audio level is attained.

5. Release the Alarm Silence button. The tone stops.

3.3.3.1.3 Pulse Tone Volume Control

1. When a valid pulse has been acquired, press the Adjust Up button and verify that the sound level of the beeping pulse tone increases.

2. Press the Adjust Down button and verify that the beeping pulse tone decreases until it is no longer audible.

3. Press the Adjust Up button to return the beep volume to a comfortable level.

3.3.3.1.4 Dynamic Operating Range

The following test sequence verifies proper monitor operation over a range of input signals:

1. Turn the instrument off and connect the SRC-2 to the NPB-290. Turn the NPB-290 on.

2. Place the SRC-2 in the RCAL 63/LOCAL mode.

3. Set the SRC-2 as indicated in Table 3-1. Verify that the NPB-290 readings are within the indicated tolerances. Allow the monitor several seconds to stabilize the readings.

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Note: An asterisk (*) indicates values that produce an alarm. Press the Alarm Silence button to silence the alarm.

Table 3-1: Dynamic Operating Range

SRC-2 Settings NPB-290 Indications

Rate Light Modulation SpO2 Pulse Rate

38 HIGH2 LOW 79 - 83* 37 - 39* 112 HIGH1 HIGH 79 - 83* 110 - 114 201 LOW LOW 79 - 83* 195 - 207* 201 LOW HIGH 79 - 83* 195 - 207*

3.3.3.1.5 Nurse Call

Note: The Nurse Call tests must be performed with the instrument operating on AC power.

1. Connect the negative lead of a voltmeter to pin 10 and the positive lead to pin 11 of the data port on the back of the instrument (Figure 10-1). Ensure that the audible alarm is not silenced or turned off.

2. Set the pulse rate switch of the SRC-2 to create an alarm condition. Refer to the SRC-2 Operator's manual. Verify that an output voltage at pins 10 and 11 between +5 and +12 volts DC.

3. Press the Alarm Silence button. With no active audible alarm, the output voltage at pins 10 and 11 must be between -5 and -12 volts DC.

4. With the instrument in an alarm condition, use an ohmmeter to verify that there is no continuity between pins 8 and 15 and that there is continuity between pins 7 and 15.

5. Adjust the alarm limits so that there is no alarm condition. Use an ohmmeter to verify that there is continuity between pins 8 and 15 and that there is no continuity between pins 7 and 15.

3.3.3.1.6 Analog Output

Note: The Analog Output tests must be performed with the instrument operating on AC power.

1. Connect the negative lead of a voltmeter to pin 10 and the positive lead to pin 6 of the data port located on the back of the instrument (Figure 1-2).

2. Turn the instrument off, then turn it back on.

3. Verify that the output voltage is 0.000 ± 0.025 volts DC, then after about a minute verify that the voltage has increased to +1.000 ± 0.025 volts DC.

4. Move the positive lead to pin 13 and repeat steps 2 and 3.

5. Move the positive lead to pin 14 and repeat steps 2 and 3.

6. Disconnect the voltmeter from the instrument.

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3.3.3.1.7 Operation on Battery Power

1. Turn the instrument on using AC power.

2. Disconnect the instrument from AC and verify the AC Power Indicator turns off.

3. Verify the instrument continues monitoring normally and that the Low Battery Indicator is not lit.

Note: If the Low Battery Indicator is lit, perform the procedure in paragraph 3.3.1.

4. Connect the instrument to AC and verify that the AC Power Indicator lights and that the instrument is monitoring normally.

3.3.3.2 General Operation

The following tests are an overall performance check of the system:

• LED Excitation Test • Monitor Operation with a Live Subject

3.3.3.2.1 LED Excitation Test

This procedure uses normal system components to test circuit operation. A Nellcor Oxisensor® II oxygen transducer, model D-25, is used to examine LED intensity control. The red LED is used to verify intensity modulation caused by the LED intensity control circuit.

1. Connect the monitor to an AC power source.

2. Connect an SCP-10 or MC-10 sensor input cable to the monitor.

3. Connect a D-25 sensor to the sensor-input cable.

4. Press the Power On/Off button to turn the monitor on.

5. Leave the sensor open with the LEDs and photodetector visible.

6. After the monitor completes its normal power-up sequence, verify that the sensor LED is brightly lit.

7. Slowly move the sensor LED in close to the photodetector element of the sensor. As the LED approaches the photodetector, verify that the LED intensity decreases.

8. Open the sensor and notice that the LED intensity increases.

9. Repeat step 7 and the intensity will again decrease. This variation is an indication that the microprocessor is in proper control of LED intensity.

10. Turn the NPB-290 off.

3.3.3.2.2 Monitor Operation with a Live Subject

Pulse oximetry involves connecting the monitor to a live subject for a qualitative test.

1. Ensure that the monitor is connected to an AC power source.

3-9


2. Connect an SCP-10 or MC-10 sensor input cable to the monitor.

3. Connect a Nellcor Durasensor® oxygen transducer, model DS-100A, to the sensor input cable.

4. Clip the DS-100A to an adult subject as recommended in the sensor directions for use.

5. Press the Power On/Off button to turn the monitor on and verify that the monitor is operating.

6. The monitor should stabilize on the subject's physiological signal in about 15 to 30 seconds. Verify that the saturation and heart rates are reasonable for the subject.

3.4 SAFETY TESTS

NPB-290 safety tests meet the standards of, and are performed in accordance with, IEC 601-1 (EN 60601-1, Second Edition, 1988; Amendment 1, 1991-11, Amendment 2, 1995-03) and UL 2601-1 (August 18, 1994), for instruments classified as Class 1 and TYPE BF, and AAMI Standard ES1 (ANSI/AAMI ES1 1993).

3.4.1 Ground Integrity

This test checks the integrity of the power cord ground wire from the AC plug to the instrument chassis ground. The current used for this test is < 6 volts RMS, 50 or 60 Hz, and 25 A.

1. Connect the monitor AC power cord to the analyzer as recommended by the analyzer operating instructions.

2. Connect the analyzer resistance input lead to the equipotential terminal (grounding lug) on the rear panel of the instrument. See Figure 1-2. Verify that the analyzer indicates 100 milliohms or less.

3.4.2 Electrical Leakage

The following tests verify the electrical leakage of the monitor:

• Earth Leakage Current • Enclosure Leakage Current • Patient Applied Risk Current • Patient Isolation Risk Current (Mains Voltage on the Applied Part)

Note: For the following tests, ensure the AC switch on the rear of the instrument is configured for the AC voltage being supplied.

3-10


3.4.2.1 Earth Leakage Current

This test is in compliance with IEC 601-1 (earth leakage current) and AAMI Standard ES1 (earth risk current). The applied voltage for AAMI ES1 is 120 volts AC, 60 Hz; for IEC 601-1 the voltage is 264 volts AC, 50 to 60 Hz. All measurements shall be made with the power switch in both the "On" and "Off" positions. Refer to Table 3-2.

1. Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions.

2. The equipotential terminal is not connected to ground.

Table 3-2: Earth Leakage Current Limits

AC Polarity Line Cord

Neutral Cord

Leakage Current

Normal Closed Closed 500 µA Reversed Closed Closed 500 µA Normal Open Closed 1000 µA Normal Closed Open 1000 µA

3.4.2.2 Enclosure Leakage Current

This test is in compliance with IEC 601-1 (enclosure leakage current) and AAMI Standard ES1 (enclosure risk current). This test is for ungrounded enclosure current, measured between enclosure parts and earth. The applied voltage for AAMI/ANSI is 120 volts AC, 60 Hz, and for IEC 601-1 the applied voltage is 264 volts AC, 50 to 60 Hz. Refer to Table 3-3.

1. Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions.

2. Place a 200-cm2 foil in contact with the instrument case, making sure the foil is not in contact with any metal parts of the enclosure that may be grounded. Measure the leakage current between the foil and earth.

Note: The analyzer leakage indication must not exceed values listed Table 3-3.

Table 3-3: Enclosure Leakage Current Limits

AC Line Cord

Neutral Line Cord

Power Line Ground Cable

IEC 601-1 AAMI/ANSI ES1 Standard

Closed Closed Closed 100 µA 100 µA Closed Closed Open 500 µA 300 µA Closed Open Closed 500 µA 300 µA Open Closed Closed 500 µA 100 µA Open Open Closed 500 µA 300 µA Open Closed Open 500 µA 300 µA

3-11


3.4.2.3 Patient Applied Risk Current

This test is in compliance with AAMI Standard ES1 (patient applied risk current), and IEC 601-1 (patient auxiliary current). The leakage current is measured between any individual patient connection and power (earth) ground. The applied voltage for AAMI/ANSI is 120 volts AC, 60 Hz, and for IEC 601-1 the applied voltage is 264 volts AC, 50 to 60 Hz. Refer to Table 3-4.

1. Configure the electrical safety analyzer as follows: Function: Patient Leakage Range: µA

2. Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions for Patient Leakage Current.

3. Connect the patient leakage input lead of the electrical safety analyzer to all pins of the monitor's patient cable at the end of the cable.


5. All functional earth terminals are not connected to ground.

6. Measure the leakage current between the patient connector and earth.

Table 3-4: Patient Leakage Current Limits

AC Line Polarity

Neutral Line Power Line Ground Cable


Normal Closed Closed 100 µA 10 µA Normal Open Closed 500 µA 50 µA Normal Closed Open 500 µA 50 µA Reverse Closed Closed 100 µA 10 µA Reverse Open Closed 500 µA 50 µA Reverse Closed Open 500 µA 50 µA

3.4.2.4 Patient Isolation Risk Current - (Mains Voltage on the Applied Part)

This test is in compliance with AAMI Standard ES1 (patient isolation risk current [sink current]), and IEC 601-1 (patient leakage current). Patient Leakage Current is the measured value in a patient connection if mains voltage is connected to that patient connection. The applied voltage for AAMI/ANSI is 120 volts AC, 60 Hz, and for IEC 601-1 the applied voltage is 264 volts AC, 50 to 60 Hz.

Warning: AC mains voltage will be present on the patient cable terminals during this test. Exercise caution to avoid electrical shock hazard.

1. Configure the electrical safety analyzer as follows: Function: Patient Leakage (Mains On Applied Part) Range: µA

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2. Connect the monitor AC plug to the electrical safety analyzer as recommended by the operating instructions for patient sink (leakage) current.

3. Connect the patient leakage input lead of the electrical safety analyzer to all connectors in the patient cable at the patient end of the cable.


5. All functional earth terminals are not connected to ground.

6. The analyzer leakage current must not exceed the values shown in Table 3-5.

Table 3-5: Patient Leakage Current Test Configurations - Mains Voltage on the Applied Part

AC Line Polarity

Neutral Line Power Line Ground Cable


Normal Closed Closed 5 mA 50 µA Reverse Closed Closed 5 mA 50 µA

3-13

(Blank Page)

SECTION 4: AUDIBLE ALARM SETTINGS AND SERVICE MENU 4.1 Introduction 4.2 Audible Alarm Settings 4.3 Operator's Menu Options 4.4 Service Menu Options

4.1 INTRODUCTION

This section discusses use of the service menu to reconfigure power-on default values, and how to control the behavior of the audible alarm.

NPB-290

4.2 AUDIBLE ALARM SETTINGS

The following paragraphs describe how to change the behavior of the audible alarm. Operators can select the volume of the alarm and the duration of alarm silence. Controls for the NPB-290 are shown in Figure 4-1.

Figure 4-1: NPB-290 Controls

4.2.1 Alarm Silence State

Press the Alarm Silence button to silence the alarm. Press the button a second time to turn the alarm back on.

4.2.2 Alarm Silence Duration

1. Press and hold the Alarm Silence button for less than 3 seconds.

2. Before 3 seconds have passed, the Adjust Up or Adjust Down button can be used to change the duration of the alarm silence. The alarm duration can be set to 30, 60, 90, or 120 seconds, or the alarm can be turned to Off.

4.2.3 Alarm Volume

1. Press and hold the Alarm Silence button for more than 3 seconds.

2. After 3 seconds, while still pressing the Alarm Silence button, the Adjust Up or Adjust Down button can be used to select alarm volumes from 1 to 10. Select a level that is suitable for the monitor's location.

4-1

Section 4: Audible Alarm Settings and Service Menu

4.3 OPERATOR'S MENU OPTIONS

The menu items listed below are options that are available to the operator. These options can be used to print or clear trend data, and to change the configuration of data from the data port. Changes can be made in menu options 1 through 5 while monitoring a patient. Menu items beyond 5 cannot be accessed when a sensor is connected to the instrument. Unless changes are saved as power-on default values, they will be lost when the NPB-290 is turned off. When the instrument is turned on again, it will begin to use the power-on default values that have been stored. Factory-set power-on default values are listed in Table 4-2.

4.3.1 Accessing Menu Items

1. Menu items can be accessed at any time by pressing the Upper and Lower Alarm Limit buttons simultaneously for at least 3 seconds. Menu options have been accessed when a "1" appears in the pulse rate display.

2. Pressing the Adjust Up or Adjust Down button selects the menu item number. Menu items 3, 5, 8, and 11 have options within them that can be selected by first pressing the Upper Alarm Limit button, and then pressing the Adjust Up or Adjust Down key. The option being selected is displayed in the %SpO2 display window.

Note: Service menu items numbered above 5 cannot be accessed if a sensor is connected to the monitor.

3. Once adjustments have been made within a menu item, the Upper Alarm Limit button can be used to initiate the current selection. To save the current settings as power-on default values, refer to the procedure outlined in paragraph 4.4.4.

4. Menu options can be exited without making changes by pressing the Lower Alarm Limit button. If a period of 10 seconds passes with no button presses, the instrument will exit the service menu, go to normal monitoring, and no changes will have been made.

4.3.2 Menu Item 1 (Trend Print)

Trend data can be viewed (if connected to a PC), or a trend printout can be made, if the Upper Alarm Limit button is pressed when menu item 1 is displayed. For more information about trend printouts, refer to paragraph 10.4.

4.3.3 Menu Item 2 (Trend Clear)

When menu item 2 is selected, trend data that is available through the use of menu item 1 will be deleted when the Upper Alarm Limit button is pressed and held until three beeps are heard.

4.3.4 Menu Item 3 (Language Selection)

1. Seven languages are available for data output to the data port. Once menu item 3 has been accessed, press the Upper Alarm Limit button. Then press the Adjust Up or Adjust Down button until the desired number is displayed in the %SpO2 window. Table 4-1 lists the languages and their numbers.

4-2


Table 4-1: Language Selection

Number Language

0 English 1 French 2 German 3 Italian 4 Spanish 5 Dutch 6 Portuguese

2. When the desired option is indicated in the %SpO2 display, press the Upper Alarm Limit button to initiate the current selection.

4.3.5 Menu Item 4 (Baud Rate)

1. Baud rates of 2400, 9600, and 19200 can be selected by first pressing the Upper Alarm Limit button, then using the Adjust Up or Adjust Down button to select the desired baud rate. The baud rates will be displayed in the %SpO2 window as 24, 96, or 192.


4.3.6 Menu Item 5 (EPP mode)

1. This menu item is used to change the method of sending data to the data port. Three options -- 0, 1, or 2 -- can be accessed by first pressing the Upper Alarm Limit button, then using the Adjust Up or Down button to scroll to the desired number.

• Option "0" enables ASCII. This option would be used to send data to a printer or to receive instructions from a computer.

• Option "1" sends data from the data port that can be used by the Nellcor Oxinet II system and with Score Software.

Note: When using Score software use the latest version. Contact Mallinckrodt's Technical Services Department or your local Mallinckrodt representative to determine the latest version of Score software.

• Option "2" is intended for Mallinckrodt use only.


Note: Menu items greater than 5 cannot be accessed when a valid sensor is connected to the unit.

4-3


4.4 SERVICE MENU OPTIONS

Service menu options can be accessed only when the sensor is disconnected from the instrument. Only qualified service personnel should access these options. Refer to paragraph 4.3.1 for instructions on how to access the menu options and make selections within them.

Note: To reach menu item 8, two invalid tones will be heard when passing through menu items 6 and 7. An invalid tone is a single low-pitched tone.

4.4.1 Menu Item 6 (Not Displayed)

4.4.2 Menu Item 7 (Not Displayed)

4.4.3 Menu Item 8 (Nurse Call Polarity)

A negative voltage is provided on pin 10 and a positive voltage on pin 11 that can be used to drive a Nurse Call alarm. This voltage will be either -5 volts DC to -12 volts DC or +5 volts DC to +12 volts DC, depending on the state of the audible alarm. An audible alarm causes the voltage to change polarity. Using menu item 8, a choice can be made to make the voltage go either positive or negative during an audible alarm.

1. Two options, 0 or 1, can be accessed by first pressing the Upper Alarm Limit button, then using the Adjust Up or Down button to scroll to the desired number.

• Selecting option "0" makes the voltage negative during an audible alarm and positive when there is no audible alarm.

• Selecting option "1" makes the voltage positive during an audible alarm and negative when there is no audible alarm.

2. When the desired option is indicated in the %SpO2 display, press the Upper Alarm Limit button to save the current selection.

4.4.4 Menu Item 9 (Save Current Values as Power-On Default)

If menu item 9 is selected, the current values for alarm limits, alarm volume, pulse beep volume, audible alarm silence duration, alarm silence behavior, communications protocol, and baud rate will be saved as the power-on default settings. To save new values as the current power-on default values, press the Upper Alarm Limit button. Three tones will sound to indicate that the changes have been accepted.

The following values are not allowed to be saved as power-on default values.

• Alarm Silence Duration of Off • Low %SpO2 alarm limits less than 80%.

If an invalid tone is heard instead of the triple beep, the current settings were not changed. An invalid tone is a single low-pitched tone.

Note: Current values will not be stored in memory as defaults if power is interrupted before exiting this menu option.

4-4


Note: When the operator changes an alarm limit to a value other than a power-on default value, a decimal point is displayed to the right of the parameter whose alarm limit was changed.

4.4.5 Menu Item 10 (Return to Default Settings)

Menu item 10 resets the monitor to factory default settings as shown in Table 4-2, three confirmation tones will be heard.

After menu item 10 has been selected, cycle power to the NPB-290 and verify that the factory default values have been reinstated.

Table 4-2: Factory Default Settings

Parameter Default Value Alarm Silence Behavior 0 (Off with reminder) Alarm Silence Duration 60 seconds Alarm Volume Level 5 Baud Rate 9600 Data Port Format Real-time ASCII Nurse Call Polarity Normally Low Pulse beep volume Level 4 Pulse rate High 170 bpm Pulse rate Low 40 bpm SpO2 High 100% SpO2 Low 85%

4.4.6 Menu Item 11 (Alarm Silence Behavior)

1. This menu item is used to change alarm silence behavior. Three options (0, 1, or 2) can be accessed by first pressing the Upper Alarm Limit button, then using the Adjust Up or Down button to scroll to the desired number.

• Option "0" allows the operator to select Alarm Silence Off. There will be a reminder tone every 3 minutes.

• Option "1" allows the operator to select Alarm Silence Off. There will be no reminder tone.

• Option "2" does not allow the operator to select Alarm Silence Off.

2. When the desired option is indicated in the %SpO2 display, press the Upper Alarm Limit button to save the current selection.

Note: The low battery audible alarm cannot be disabled.

4.4.7 Menu Item 12

Do not use. For use by Mallinckrodt Customer Service Engineer.

4.4.8 Menu Item 13

Do not use. For use by Mallinckrodt Customer Service Engineer.

4-5


4.4.9 Menu Item 14 (Calibration Signal)

Menu item 14 will initiate the calibration signal. The calibration signal will begin at 0.0 volts DC and hold that point for 60 seconds. It will then jump up to its maximum of +1.0 volt DC and hold that value for 60 seconds. The third part of the calibration signal is a stair-step signal. The stair-step signal starts at 0.0 volts DC and increases up to +1.0 volt DC in 0.1-volt increments. Each increment will be held for 1 second. Refer to Table 10-1 for Data port pin outs.

4-6

SECTION 5: TROUBLESHOOTING 5.1 Introduction 5.2 How to Use this Section 5.3 Who Should Perform Repairs 5.4 Replacement Level Supported 5.5 Obtaining Replacement Parts 5.6 Troubleshooting Guide 5.7 Error Codes

5.1 INTRODUCTION

This section explains how to troubleshoot the NPB-290. Tables are supplied that list possible monitor difficulties, along with probable causes, and recommended actions to correct each difficulty.

5.2 HOW TO USE THIS SECTION

Use this section in conjunction with Section 3, Performance Verification, and Section 7, Spare Parts. To remove and replace a part you suspect is defective, follow the instructions in Section 6, Disassembly Guide. The circuit analysis in Section 11, Technical Supplement, offers information on how the monitor functions.

5.3 WHO SHOULD PERFORM REPAIRS

Only qualified service personnel should open the monitor housing, remove and replace components, or make adjustments. If your medical facility does not have qualified service personnel, contact Mallinckrodt Technical Services or your local Mallinckrodt representative.

5.4 REPLACEMENT LEVEL SUPPORTED

The replacement level supported for this product is to the printed circuit board (PCB) and major subassembly level. Once you isolate a suspected malfunctioning PCB, follow the procedures in Section 6, Disassembly Guide, to replace the PCB with a known good PCB. Check to see if the symptom disappears and that the monitor passes all performance tests. If the symptom persists, swap back the replacement PCB with the suspected malfunctioning PCB (the original PCB that was installed when you started troubleshooting) and continue troubleshooting as directed in this section.

5.5 OBTAINING REPLACEMENT PARTS

Mallinckrodt Technical Services provides technical assistance information and replacement parts. To obtain replacement parts, contact Mallinckrodt or your local Mallinckrodt representative. Refer to parts by the part names and part numbers listed in Section 7, Spare Parts.

5-1

Section 5: Troubleshooting

5.6 TROUBLESHOOTING GUIDE

Table 5-1 categorizes problems with the NPB-290. Refer to the paragraph indicated for further troubleshooting instructions.

Note: Taking the recommended actions discussed in this section will correct the majority of problems you will encounter. However, problems not covered here can be resolved by calling Mallinckrodt Technical Services or your local Mallinckrodt representative.

Table 5-1: Problem Categories

Problem Area Refer to Paragraph 1. Power

• No power-up on AC and/or DC • Fails power-on self-test • Powers down without apparent cause

5.6.1

2. Buttons • Monitor does not respond properly to

buttons

5.6.2

3. Display/Alarms • Displays do not respond properly • Alarms or other tones do not sound

properly or are generated without apparent cause

5.6.3

4. Operational Performance • Displays appear to be operational, but

monitor shows no readings • Suspect readings

5.6.4

5. Data Port • NPB-290 and PC not communicating

properly • Nurse Call not functioning properly

5.6.5

All of the categories in Table 5-1 are discussed in the following paragraphs.

5-2


5.6.1 Power

Power problems are related to AC and/or DC. Table 5-2 lists recommended solutions to power problems.

Table 5-2: Power Problems

Condition Recommended Action 1. BATTERY LOW

indicator lights steadily while NPB-290 is connected to AC and battery is fully charged.

1. Ensure that the NPB-290 is plugged into an operational AC outlet and the AC indicator is on.

2. Check the fuses. The Power Entry Module contains the fuses as indicated in paragraph 6.3 and Figure 6-1 of Section 6, Disassembly Guide. Replace fuses if necessary.

3. Open the monitor as described in paragraph 6.4. Verify the power supply's output to the battery while on AC power. Disconnect the battery leads from the battery and connect a digital voltmeter (DVM) to the leads from the power supply. The voltage measured should be 6.80 volts DC ± 0.15 volts DC. Connect the negative lead to the battery, connect the DVM in series between the positive leads of the battery and the power supply. The current measured should be 400 mA ± 80 mA. Replace power supply if above values are not met (refer to paragraph 6.8).

4. Check the cable connection from the bottom enclosure to the User Interface PCB, as instructed in paragraph 6.11 of Section 6, Disassembly Guide. If the connection is good, replace the User Interface PCB.

2. The NPB-290 does not operate when disconnected from AC power.

1. The battery may be discharged. To recharge the battery, refer to paragraph 3.3.1, Battery Charge. The monitor may be used with a less than fully charged battery but with a corresponding decrease in operating time.

2. If the battery fails to hold a charge, replace the battery as indicated in paragraph 6.6.

3. BATTERY LOW indicator on during DC operation and an alarm is sounding.

There are 15 minutes or less of usable charge left on the NPB-290 battery before the instrument shuts off. At this point, if possible, cease use of the NPB-290 on battery power, connect it to an AC source, and allow it to recharge. The full recharge takes 14 hours. The NPB-290 may continue to be used while it is recharging.

4. Battery does not charge.

1. Replace battery if more than 2 years old. 2. Perform step 3 of the recommended action for condition 1

above.

5-3


5.6.2 Buttons

Table 5-3 lists symptoms of problems relating to nonresponsive buttons and recommended actions. If the action requires replacement of a PCB, refer to Section 6, Disassembly Guide.

Table 5-3: Button Problems

Symptoms Recommended Action 1. The NPB-290 responds to

some, but not all, buttons. 1. Replace Top Housing assembly. Refer to paragraph

6.4. 2. If the buttons still do not work, replace the User

Interface PCB. Refer to paragraph 6.11. 2. The NPB-290 turns on but

does not respond to any of the buttons.

1. Check the connection between the membrane panel and J5 of the User Interface PCB. Refer to paragraph 6.10.

2. Replace Top Housing assembly. Refer to paragraph 6.4.

3. If the buttons still do not work, replace the User Interface PCB. Refer to paragraph 6.11.

5-4


5.6.3 Display/Alarms

Table 5-4 lists symptoms of problems relating to nonfunctioning displays, audible tones or alarms, and recommended actions. If the action requires replacement of a PCB or module, refer to Section 6, Disassembly Guide.

Table 5-4: Display/Alarms Problems Symptoms Recommended Action

1. Display values are missing or erratic.

1. Try another sensor or relocate the sensor to a different site.

2. If the sensor is connected, replace the sensor connector assembly.

3. If the condition persists, replace the sensor extension cable.

4. If the condition still persists, replace the User Interface PCB. Refer to paragraph 6.11.

2. Not all display segments light during POST.

1. Check the connection between the User Interface PCB and the Display PCB. See Figures 6-8 and 6-9.

2. If the condition does not change, replace the Display PCB. Refer to paragraph 6.10.


3. All Front Panel LED indicators do not light during POST.

1. Check the connection between the membrane panel and J5 of the User Interface PCB. See Figures 6-8 and 6-9.

2. Replace Top Housing assembly. Refer to paragraph 6.4.

4. Alarm sounds for no apparent reason.

1. Moisture or spilled liquids can cause an alarm to sound. Allow the monitor to dry thoroughly before use.

2. If the condition persists, replace the User Interface PCB. Refer to paragraph 6.11.

5. Display is flashing but there is no audible alarm.

1. Verify that alarm silence has not been activated. 2. Check speaker connection to UIF PCB. Refer to

paragraph 6.12. 3. Replace the speaker. Refer to paragraph 6.12. 4. If the condition persists, replace the User Interface

PCB. Refer to paragraph 6.11. 6. An alarm condition exists

but no alarm (audible or visual) is indicated.

Replace the User Interface PCB. Refer to paragraph 6.11.

5-5


5.6.4 Operational Performance

Table 5-5 lists symptoms of problems relating to operational performance (no error codes displayed) and recommended actions. If the action requires replacement of a PCB or module, refer to Section 6, Disassembly Guide.

Table 5-5: Operational Performance Problems

Symptoms Recommended Action 1. The Pulse Amplitude

indicator seems to indicate a pulse, but the digital displays show zeroes.

1. The sensor may be damaged; replace it. 2. If the condition persists, replace the User Interface

PCB. Refer to paragraph 6.11.

2. SpO2 or pulse rate values change rapidly; Pulse Amplitude indicator is erratic.

1. The sensor may be damp or may have been reused too many times. Replace it.

2. An electrosurgical unit (ESU) may be interfering with performance: _ Move the NPB-290 and its cables and sensors

as far from the ESU as possible. _ Plug the NPB-290 and the ESU into different

AC circuits. _ Move the ESU ground pad as close to the

surgical site as possible and as far away from the sensor as possible.

3. Verify performance with the procedures detailed in Section 3.

4. If the condition persists, replace the User Interface PCB. Refer to paragraph 6.11.

5-6


5.6.5 Data Port

Table 5-6 lists symptoms of problems relating to the data port and recommended actions. If the action requires replacement of the PCB, refer to Section 6, Disassembly Guide.

Table 5-6: Data Port Problems

Symptoms Recommended Action 1. No printout is being

received. 1. The unit is running on battery power. Connect to

an AC source. If the AC indicator is not on, Refer to paragraph 5.6.1.

2. The monitor's baud rate does not match the printer. Change the baud rate of the monitor, following instructions in Operator's manual.

3. Check connections between data port and printer. Refer to paragraph 10.3.


2. The Nurse Call function (RS232 level) is not working.

1. The unit is running on battery power. Connect to an AC source. If the AC indicator is not on, Refer to paragraph 5.6.1.

2. Verify connections are made between pins 5 or 10 (GND) and 11 (Nurse Call) of the data port. Refer to paragraph 10.5.

3. Verify output voltage between ground pin 5 or 10 and pin 11 is -5 to -12 VOLTS DC (no alarm) and +5 to +12 VOLTS DC (during alarm). Refer to paragraph 3.3.3.1.5.


3. The Nurse Call function (relay contacts) is not working.

1. Verify voltage and current do not exceed values stated in Table 10-4.

2. Replace User Interface PCB. Refer to paragraph 6.11.

4. RS-422 not working. 1. Verify the cable is constructed following procedures outlined in paragraph 10.3.


5. Analog data inaccurate. 1. Verify NPB-290 is operating on AC power. Refer to paragraph 3.3.2.1.

2. Verify the recorder is calibrated to the NPB-290. Refer to recorder Operator's manual.

3. Verify the analog output values by performing the test outlined in paragraph 3.3.3.1.6.


5-7


5.7 ERROR CODES

An error code will be displayed when the NPB-290 detects a non-correctable failure. When this occurs, the unit will stop monitoring, sound a low priority alarm that cannot be silenced, clear patient data from the display, and display an error code. Error codes will be displayed with EEE in the saturation display and the number of the code in the pulse rate display, i.e., EEE 1. Table 5-7 provides a complete list of error codes and possible solutions. Cycling the power will clear the code and allow the instrument to function normally if no other errors are detected.

Table 5-7: Error Codes

Code Meaning Possible Solutions 1 POST failure Replace User Interface PCB. Refer

to paragraph 6.11. 4 Battery dead 1. Check the voltage selector

switch. Refer to the N-290 Operator's manual.

2. Charge battery for 14 hours. Refer to paragraph 3.3.1.

3. Leads of battery reversed. Refer to paragraph 6.6.

4. Replace battery. Refer to paragraph 6.6.

5 Too many microprocessor resets within a period of time

1. Cycle power to clear error 2. Replace User Interface PCB.

Refer to paragraph 6.11. 3. Replace Power Supply PCB.

Refer to paragraph 6.8. 6 Boot CRC error 1. Cycle power to clear error


7 Error on User Interface PCB 1. Cycle power to clear error. 2. Check voltage selector switch for proper setting. 3. Replace User Interface PCB.

Refer to paragraph 6.11. 11 Flash ROM corruption 1. Cycle power to clear error


52 Institutional default values lost and reset to factory default values


Refer to paragraph 6.11. 76 Error accessing EEPROM 1. Cycle power to clear error


80 Institutional default values lost and reset to factory default values


Refer to paragraph 6.11.

5-8


Table 5-7: Error Codes

Code Meaning Possible Solutions 82 Time clock lost 1. Reset time clock

2. Battery power lost, check the battery. Refer to paragraph 3.3.3.1.7.

3. Replace the Power Supply. Refer to paragraph 6.8.

84 Internal communications error 1. Cycle power to clear error 2. Replace User Interface PCB.

Refer to paragraph 6.11.

5-9

(Blank Page)

SECTION 6: DISASSEMBLY GUIDE 6.1 Introduction 6.2 Prior to Disassembly 6.3 Fuse Replacement 6.4 Monitor Disassembly 6.5 Monitor Reassembly 6.6 Battery Replacement 6.7 Power Entry Module (PEM) Removal/Replacement 6.8 Power Supply Removal/Replacement 6.9 Cooling Fan Removal/Replacement 6.10 Display PCB Removal/Replacement 6.11 User Interface PCB Removal/Replacement 6.12 Alarm Speaker Removal/Replacement

6.1 INTRODUCTION

The NPB-290 can be disassembled down to all major component parts, including:

• PCBs • Battery • Top and Bottom Housing • Speaker • Power Entry Module (PEM)

The following tools are required:

• Phillips-head screwdriver #1 • 10 mm open-end wrench • Needle-nose pliers • Torque wrench, 10 inch-pounds (1.13 Newton-meters) • Wire Cutters • Flat blade screwdriver

WARNING: Before attempting to open or disassemble the NPB-290, disconnect the power cord from the NPB-290.

Caution: Observe ESD (electrostatic discharge) precautions when working within the unit.

Note: Some spare parts have a business reply card attached. When you receive these spare parts, please fill out and return the card.

6.2 PRIOR TO DISASSEMBLY

1. Turn the NPB-290 off by pressing the Power On/Off button.

2. Disconnect the monitor from the AC power source.

6-1

Section 6: Disassembly Guide

6.3 FUSE REPLACEMENT

1. Complete the procedure in paragraph 6.2.

2. Disconnect the power cord from the back of the monitor.

3. Use a flat blade screwdriver to remove the fuse drawer from the Power Entry Module. Press down on the tab in the center of the fuse drawer with the screwdriver until a click is heard. Pull the drawer out as shown in Figure 6-1.

Figure 6-1: Fuse Removal

4. Put new, 5 x 20 mm, slow blow, 0.5-amp, 250-volt fuses in the drawer and reinsert the drawer in the power module.

6-2


6.4 MONITOR DISASSEMBLY

Caution: Observe ESD (electrostatic discharge) precautions when disassembling and reassembling the NPB-290 and when handling any of the components of the NPB-290.

1. Set the NPB-290 upside down, as shown in Figure 6-2.

Figure 6-2: NPB-290 Corner Screws

2. Remove the four corner screws.

3. Turn the unit upright.

4. Separate the top case from the bottom case of the monitor, being careful not to stress the wire harnesses between the cases.

5. Place the two halves of the monitor on the table as shown in Figure 6-3.

6. Disconnect the power supply from J6 on the User Interface PCB.

6-3


Figure 6-3: Separating Case Halves

6.5 MONITOR REASSEMBLY

1. Place the two halves of the monitor on the table as shown in Figure 6-3.

2. Connect the power supply to J6 on the User Interface PCB.

3. Place the top case over the bottom case.

4. Align the four outside screw posts.

5. Close the monitor.

Caution: When reassembling the NPB-290, hand-tighten the screws that hold the cases together to a maximum of 10 inch-pounds. Over-tightening could strip out the screw holes in the top case, rendering them unusable.

6. Install the four corner screws.

6-4


6.6 BATTERY REPLACEMENT

Removal

1. Follow procedure in paragraphs 6.2 and 6.4.

2. Remove the two screws from the battery bracket as shown in Figure 6-4.

3. Lift the battery out of the bottom case.

4. Use needle-nose pliers to disconnect the leads from the battery.

Note: The lead-acid battery is recyclable. Do not dispose of the battery by placing it in the regular trash. Dispose of properly according to state, local, or other applicable regulations, or contact Mallinckrodt Technical Services to return for disposal.

Figure 6-4: Battery Removal

Replacement

5. Connect the leads to the battery.

• Red wire connects to the positive terminal. • Black wire goes to the negative.

6. Insert the new battery into the bottom case with the negative terminal towards the bottom of the monitor.

7. Install the bracket and grounding lead with the two screws.


9. Turn the monitor on and verify proper operation.

6-5


6.7 POWER ENTRY MODULE (PEM) REMOVAL/REPLACEMENT

Removal

1. Complete the procedure in paragraphs 6.2 and 6.4.

2. While pushing the top of the PEM in from the outside of the case, gently push the case to the outside and lift up on the PEM.

3. Use needle-nose pliers to disconnect the leads from the PEM (see Figure 6-5).

Figure 6-5: Power Entry Module

Replacement

4. Refer to Table 6-1 and connect the leads to the PEM.

5. Install the PEM in the bottom case with the fuse drawer facing down. A tab in the bottom case holds the PEM in place. Insert the bottom wing of the PEM between the tab and the internal edge of the sidewall in the bottom case. Push the PEM down and towards the outside of the monitor until it clicks into place.

6. Position the ground line from the PEM so that it does not come into contact with components on the Power Supply PCB.


6-6


6.8 POWER SUPPLY REMOVAL/REPLACEMENT

Removal

1. Complete the procedure described in paragraphs 6.2 and 6.4.

2. Disconnect the leads from the battery.

3. Follow the procedure in paragraph 6.7, steps 2 and 3.

4. Use a 10-mm wrench to disconnect the power supply ground lead from the equipotential lug (Figure 6-5).

5. Disconnect the cooling fan harness from J1 of the power supply (Figure 6-7).

6. Remove the seven screws shown in Figure 6-6.

7. Lift the power supply out of the bottom case.

Figure 6-6: Power Supply

6-7


Replacement

8. Connect the AC leads W1, W2, and W3 to the PEM following the instructions in Table 6-1.

Table 6-1: Power Supply Leads Connections

Power Supply Lead

Wire Color or Label

Connects To

W1 Green & Yellow "G" Equipotential Lug W2 Brown/Labeled "L" "L" on the Power Entry Module W3 Blue/Labeled "N" "N" on the Power Entry Module W4 Red Positive Battery Terminal W5 Black Negative Battery Terminal

9. Place the power supply in the bottom case.

Caution: When installing the Power Supply, tighten the seven screws to a maximum of 10 inch-pounds. Over-tightening could strip out the inserts in the bottom case, rendering them unusable.

10. Install the seven screws in the power supply and tighten.

11. Connect the cooling fan harness to J1 of the power supply.

12. Use a 10-mm open-end wrench to connect the power supply ground lead to the equipotential lug. Tighten to 12 inch-pounds.

13. Follow the procedure in paragraph 6.7, steps 5 and 6.

14. Verify the ground wire to the PEM is positioned so that it does not come into contact with components on the Power Supply PCB.

15. Reconnect W4 and W5 to the battery by following the instructions in Table 6-1.


6-8


6.9 COOLING FAN REMOVAL/REPLACEMENT

Removal

1. Complete procedures described in 6.2 and 6.4.

2. Lift the cooling fan from the slots in the bottom case (see Figure 6-7).

3. Disconnect the fan wire harness from J1 on the power supply PCB.

Figure 6-7: Cooling Fan

Replacement

4. Connect the cooling fan wire harness to J1 on the power supply PCB.

5. Insert the cooling fan into the slots in the bottom case with the padded sides on the top and bottom and the fan's harness to the handle side of the case.

6. Complete procedure 6.5.

6-9


6.10 DISPLAY PCB REMOVAL/REPLACEMENT

Removal


Caution: Care must be taken when removing the Display PCB from the top case to avoid scratching the lens or LED modules.

2. Gently pull the top of the Display PCB towards the inside of the instrument and lift the Display PCB up to remove it from the top case (Figure 6-8).

Figure 6-8: Display PCB

Replacement

Caution: Care must be taken when installing the Display PCB into the top case to avoid scratching the lens or LED modules.

3. Tilt the top of the Display PCB towards the inside of the instrument and gently slide the Display PCB into the grooves in the top case. Be careful to align the male pins from the Display PCB to connector J2 on the User Interface PCB.

4. Complete the procedure described in paragraph 6.5.

6-10


6.11 USER INTERFACE PCB REMOVAL/REPLACEMENT

Removal


2. Follow step 2 of paragraph 6.10 (Figure 6-8).

3. Disconnect the keypad ribbon cable from the ZIF connector, J8, on the User Interface PCB (Figure 6-9). Lift up on the outer shell until it clicks, then remove the ribbon cable from the connector.

4. Disconnect the speaker cable from J13 of the User Interface PCB.

5. Remove the five screws in the User Interface PCB.

Figure 6-9: User Interface PCB

6. Remove the User Interface PCB from the top case.

6-11


Replacement

Caution: When installing the User Interface PCB, hand-tighten the five screws to a maximum of 10 inch-pounds. Overtightening could strip out the inserts in the top case, rendering them unusable.

7. Place the User Interface PCB in the top case.

8. Install the five screws in the User Interface PCB.

9. Lift up on the outer shell of J8 on the User Interface PCB until it clicks.

10. Insert the keypad ribbon cable into J8 of the User Interface PCB.

11. Slide the outer shell of J8 down until it clicks.

12. Connect the speaker cable to J13 of the User Interface PCB.

13. Follow step 3 of paragraph 6.10.


6.12 ALARM SPEAKER REMOVAL/REPLACEMENT

Removal


2. Disconnect the speaker wire harness for J13 on the User Interface PCB (see Figure 6-10).

3. Pull the speaker holding clip towards the center of the monitor and lift the speaker from the top housing.

6-12


Figure 6-10: Alarm Speaker

Replacement

4. Slide the speaker into the plastic holding clip provided in the top housing.

5. Connect the speaker wire harness to J13 on the User Interface PCB.

6. Complete the procedure described in paragraph 6.5.

6-13

(Blank Page)

SECTION 7: SPARE PARTS 7.1 Introduction

7.1 INTRODUCTION

Spare parts, along with part numbers, are shown in Table 7-1. Figure 7-1 shows the NPB-290 expanded view with item numbers relating to the spare parts list.

Table 7-1: Parts List

Item Description Part No. 1 Top Case Assembly (Membrane Panel Included) 048497 2 Fuse Drawer 691500 3 Fuses 691032 4 Power Entry Module 691499 5 Cooling Fan 035469 6 Power Supply 035800 7 Display PCB (Printed Circuit Card) 035347 8 Battery 640119 9 Battery Bracket 035307

10 User Interface PCB 035351 Alarm Speaker (not shown) 033494 Rubber Feet (not shown) 4-003818-00 Power Cord (not shown) U.S. 071505

International 901862 U.K. 901863

Tilt Stand (not shown) 891340 GCX Mounting Kit (not shown) 035434

Note: Some spare parts have a business reply card attached. When you receive these spare parts, please fill out and return the card.

7-1

Section 7: Spare Parts

NPB-290

Figure 7-1: NPB-290 Exploded View

7-2

SECTION 8: PACKING FOR SHIPMENT 8.1 General Instructions 8.2 Repacking in Original Carton 8.3 Repacking in a Different Carton

To ship the monitor for any reason, follow the instructions in this section.

8.1 GENERAL INSTRUCTIONS

Pack the monitor carefully. Failure to follow the instructions in this section may result in loss or damage not covered by any applicable Mallinckrodt warranty. If the original shipping carton is not available, use another suitable carton. North American customers may call Mallinckrodt Technical Services Department to obtain a shipping carton.

Before shipping the NPB-290, contact Mallinckrodt Technical Services Department for a returned goods authorization (RGA) number. Mark the shipping carton and any shipping documents with the RGA number. European customers not using RGA numbers should return the product with a detailed, written description of the problem.

Return the NPB-290 by any shipping method that provides proof of delivery.

8.2 REPACKING IN ORIGINAL CARTON

If available, use the original carton and packing materials. Pack the monitor as follows:

1. Place the monitor in a plastic bag (not shown in Figure 8-1) and, if necessary, accessory items in original packaging.

2. Place in shipping carton and seal carton with packing tape.

3. Label carton with shipping address, return address, and RGA number.

8-1

Section 8: Packing for Shipment

Figure 8-1: Repacking the NPB-290

8-2

Section 8: Packing for Shipment

8.3 REPACKING IN A DIFFERENT CARTON

If the original carton is not available, use the following procedure to pack the NPB-290:

1. Place the monitor in a plastic bag.

2. Locate a corrugated cardboard shipping carton with at least 200 pounds per square inch (psi) bursting strength.

3. Fill the bottom of the carton with at least 2 inches of packing material.

4. Place the bagged unit on the layer of packing material and fill the box completely with packing material.

5. Seal the carton with packing tape.

6. Label the carton with the shipping address, return address, and RGA number.

8-3

(Blank Page)

SECTION 9: SPECIFICATIONS 9.1 General 9.2 Electrical 9.3 Physical Characteristics 9.4 Environmental 9.5 Alarms 9.6 Factory Default Settings 9.7 Performance

9.1 GENERAL

Designed to meet safety requirements of:

UL 2601-1 CSA-C22.2 No. 601-1-M90, IEC 601-1 (Class I, type BF), ISO 9919, EMC per EN 60601-1-2.

9.2 ELECTRICAL Protection Class Class I: per I.E.C. 601-1, clause 2.2.4 Degree of Protection Type BF: per I.E.C. 601-1, clause 2.1.25 Mode of Operation Continuous Battery Type: Rechargeable, sealed lead-acid, internal Operating time: 8 hours minimum on new, fully charged battery and no

active alarms Recharge period: 14 hours for full charge in standby

18 hours while in use Fuses 2 each 5 x 20 mm

Slow Blow 0.5 amp, 250 volts AC Power Selectable by switch 100-120 volts AC, 50/60 Hz or

200-240 volts AC, 50/60 Hz

9.3 PHYSICAL CHARACTERISTICS Dimensions 3.3 in. H x 10.4 in. W x 6.8 in. D

8.4 cm H x 26.4 cm W x 17.3 cm D Weight 5.5 lb, 2.5 kg

9.4 ENVIRONMENTAL Operating Temperature 5° C to 40° C (+41° F to +104° F) Storage Temperature Boxed -20° C to +70° C (-4° F to +158° F) Unboxed -20° C to +60° C (-4° F to +140° F) Operating Atmospheric Pressure

700 hPa to 1060 hPa (20.65 in Hg to 31.27 in Hg)

Relative Humidity 15% RH to 95% RH, noncondensing

9-1

Section 9: Specifications

9.5 ALARMS Alarm Limit Range % Saturation 20–100% Pulse Rate 30–250 bpm

9.6 FACTORY DEFAULT SETTINGS

Table 9-1: Default Settings

Parameter Default Setting Alarm Silence Behavior Off with a reminder Audible Alarm Silence Duration 60 seconds Audible Alarm Volume Level 5 Baud Rate 9600 Communication Protocol Serial output mode ASCII High Pulse Rate Alarm 170 bpm Low Pulse Rate Alarm 40 bpm Pulse Beep Volume Level 4 SpO2 High Alarm 100% SpO2 Low Alarm 85%

9.7 PERFORMANCE Measurement Range SpO2: 0–100% Pulse/Heart Rate: 20–250 bpm Accuracy SpO2 Adult: 70–100% ± 2 digits

0–69% unspecified Neonate: 70–100% ± 3 digits

0–69% unspecified Accuracies are expressed as plus or minus "X" digits (saturation percentage points) between saturations of 70-100%. This variation equals plus or minus one standard deviation (1SD), which encompasses 68% of the population. All accuracy specifications are based on testing the subject monitor on healthy adult volunteers in induced hypoxia studies across the specified range. Adult accuracy is determined with Oxisensor II D-25 sensors. Accuracy for neonatal readings is determined with Oxisensor II N-25 sensors. In addition, the neonatal accuracy specification is adjusted to take into account the theoretical effect of fetal hemoglobin in neonatal blood on oximetry measurements.

Pulse Rate (optically derived) 20–250 bpm ± 3 bpm

Accuracies are expressed as plus or minus "X" bpm across the display range. This variation equals plus or minus 1 Standard Deviation, which encompasses 68% of the population.

9-2

SECTION 10: DATA PORT INTERFACE PROTOCOL

10.1 Introduction 10.2 Enabling the Data Port 10.3 Connecting to the Data Port 10.4 Real-Time Printout 10.5 Nurse Call 10.6 Analog Output 10.7 Interactive Mode

10.1 INTRODUCTION

The data port, located at the rear of the NPB-290, provides interfacing capabilities for:

• printing NPB-290 data • displaying NPB-290 data on a computer • sending NPB-290 data to the Nellcor Oxinet II System • Nurse Call

10.2 ENABLING THE DATA PORT

The data port supports three communication protocols:

• Option 0 = real-time ASCII for printouts or displays • Option 1 = communications with Nellcor Oxinet II system • Option 2 = Mallinckrodt Technical Services use only

Menu item 4 is used to select baud rate. To access menu item 4:

• disconnect the sensor cable • press both the Upper and Lower Alarm Limit buttons simultaneously for

3 seconds • press the Upper Alarm Limit button until menu item 6 is displayed • select baud rate by pressing Adjust Up or Adjust Down button (2400,

9600 [default], or 19200)

Menu item 5 allows the user to choose between the three communication protocols. To access menu item 5:

• disconnect the sensor cable • press both the Upper Alarm Limit and the Lower Alarm Limit buttons

simultaneously for 3 seconds • press the Upper Alarm Limit button until menu item 5 is displayed • select desired option by pressing the Adjust Up or Adjust Down button

Note: More information on using menu options is provided in Section 4.

10-1

Section 10: Data Port Interface Protocol

10.3 CONNECTING TO THE DATA PORT

Data is transmitted in the RS-232 format (pins 2, 3, and 5) or RS-422 (pins 1, 4, 9, and 12). RS-232 data can be transmitted a maximum of 25 feet. The pin outs for the data port are listed in Table 10-1.

Table 10-1 Data Port Pin Outs

Pin Signal 1 RXD+ (RS-422 positive input) 2 RXD_232 (RS-232 input) 3 TXD_232 (RS-232 output) 4 TXD+ (RS-422 positive output) 5 Signal Ground (isolated from earth ground) 6 AN_SpO2 (analog saturation output) 7 Normally Open, Dry Contacts, for Nurse Call

(N.O. with no active alarm) 8 Normally Closed, Dry Contacts, for Nurse Call

(N.C. with no active alarm) 9 RXD- (RS-422 negative input)

10 Signal Ground (isolated from earth ground) 11 Nurse Call (RS-232 level output -3 to -10 volts

DC with no active alarm +3 to +10 volts DC with active alarm)

12 TXD- (RS-422 negative output) 13 AN_PULSE (analog pulse rate output) 14 AN_PLETH (analog pleth wave output) 15 Nurse Call Common for Dry Contacts

Note: When the instrument is turned off, the contact at pin 7 closes and the contact at pin 8 opens.

The pin layouts are illustrated in Figure 10-1. The conductive shell is used as earth ground. An AMP connector is used to connect to the data port. Use AMP connector (AMP P/N 747538-1), ferrule (AMP P/N 1-747579-2) and compatible pins (AMP P/N 66570-2).

Figure 10-1: Data Port Pin Layout

When building an RS-422 cable, a resistor (120 Ω, 1/4 watt, 5%) must be added between pins 1 and 9 of the cable. The end of the cable with the resistor added must be plugged into the NPB-290. This resistor is not necessary for RS-232 cables.

10-2


The serial cable must have a braided shield providing 100% coverage such as Beldon cable (Beldon P/N 9616) or equivalent. Connectors at both ends of the serial cable must have the shield terminated to the full 360 degrees of the connector's metal shell. Do not create sharp bends in the cable, this may tear or break the shield.

10.4 REAL-TIME PRINTOUT

When a real-time printout is being transmitted, a new line of data is printed every 2 seconds. Every 25th line will be a Column Heading line. A Column Heading line will also be printed any time a value in the Column Heading line is changed. A real time printout is shown below in Figure 10-2.

Note: Printouts are available only if the instrument is running on AC power.

NPB-290 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpm TIME %SpO2 PR (bpm) PA Status 01-Jul-97 14:00:00 100 120 220 01-Jul-97 14:00:02 100 124 220 01-Jul-97 14:00:04 100 190 220 01-Jul-97 14:00:06 100 190* 220 PH 01-Jul-97 14:00:08 100 190* 220 PH 01-Jul-97 14:00:10 100 190* 220 PH 01-Jul-97 14:00:12 100 190* 220 PH 01-Jul-97 14:00:14 100 190* 220 PH 01-Jul-97 14:00:16 100 190* 220 PH LB 01-Jul-97 14:00:18 100 190* 220 PH LB 01-Jul-97 14:00:20 100 190* 220 PH LB 01-Jul-97 14:00:22 - - - - - - - - - SD LB 01-Jul-97 14:00:24 - - - - - - - - - SD LB 01-Jul-97 14:00:26 - - - - - - - - - SD 01-Jul-97 14:00:28 - - - - - - - - - SD 01-Jul-97 14:00:30 - - - - - - - - - SD 01-Jul-97 14:00:32 - - - - - - - - - SD 01-Jul-97 14:00:34 - - - - - - - - - PS 01-Jul-97 14:00:36 - - - - - - - - - PS 01-Jul-97 14:00:38 - - - - - - - - - PS 01-Jul-97 14:00:40 - - - - - - - - - PS 01-Jul-97 14:00:42 - - - - - - - - - PS 01-Jul-97 14:00:44 - - - - - - - - - PS NPB-290 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpm TIME %SpO2 PR (bpm) PA Status 01-Jul-97 14:00:46 - - - - - - - - - PS NPB-290 Version 1.0.0 CRC XXXX SpO2 Limit: 80-100% PR Limit: 100-180 bpm TIME %SpO2 PR (bpm) PA Status 01-Jul-97 14:00:56 79* 59* 220 SL PL LB 01-Jul-97 14:00:58 79* 59* - - - PS SL PL LB

Figure 10-2: Real-Time Printout

10-3


Column Heading

NPB-290 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpm TIME %SpO2 PR (bpm) PA Status

To explain the printout it will be necessary to break it down to its key components. The first two lines of the chart are the Column Heading shown above. Every 25th line will be a Column Heading. A Column Heading is also printed whenever a value of the Column Heading is changed. There are three Column Heading lines shown in Figure 10-2. Using the top row as the starting point there are 25 lines before the second Column Heading is printed. The third Column Heading was printed because the SpO2 limits changed from 30-100% to 80-100%.

Printout Source

NPB-290 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpm

TIME %SpO2 PR (bpm) PA Status

Data in the highlighted box above represents the source of the printout, in this case the NPB-290.

Software Revision Level



The next data field tells the user the software level, (Version 1.0.0) and a software verification number (CRC XXXX). Neither of these numbers should change during normal operation. The numbers will change if the monitor is serviced and receives a software upgrade.

Alarm Limits



The last data field in the top line indicates the high and the low alarm limits for %SpO2 and for the pulse rate (PR). In the example above, the low alarm limit for SpO2 is 30% and the high alarm limit is 100%. Pulse rate alarm limits are 100 bpm (low), and 180 bpm (high).

Column Headings



Actual column headings are in the second row of the Column Heading line. Patient data, from left to right, are the time that the chart was printed, the current %SpO2 value being measured, the current pulse rate in beats per minute (bpm), the current Pulse Amplitude (PA), and the operating status of the NPB-290.

10-4


Patient Data and Operating Status

Time Tag

TIME %SpO2 PR (bpm) PA Status 01-Jul-97 14:00:58 100 120 220

Time Tag represents a real-time clock in: Day, Month, Year and 24-hour clock. The clock is maintained by either AC or battery power. If date and time have to be changed, follow the procedure outlined in paragraph 10.7.

Patient Data


TIME %SpO2 PR (bpm) PA Status 01-Jul-97 14:00:58 100 190* 220 PH

Patient data and the operating status of the unit are highlighted in the patient data display. Parameter values are displayed directly beneath the heading for each parameter. In this example, the %SpO2 is 100, and the pulse rate (PR) is 190 beats per minute. The asterisk (*) next to the 190 indicates that 190 beats per minute is outside of the alarm limits, indicated at the far-right end in the top row, for pulse rate. If no data for a parameter is available, three dashes (- - -) will be displayed in the printout.

The number under PA is an indication of pulse amplitude. The number can range from 0 to 254 and will typically range around 45. There are no alarm parameters for this value. It can be used for trending information and indicates a change in pulse volume, pulse strength, or circulation.

Operating Status


TIME %SpO2 PR (bpm) PA Status 01-Jul-97 14:00:58 100 190* 220 PH

The Status column indicates alarm conditions and operating status of the NPB-290. The PH in this example indicates a Pulse High alarm. The Status column can have as many as 4 codes displayed in one line of data. The status codes are listed in Table 10-2.

10-5


Table 10-2: Status Codes

Code Meaning AO Alarm OffAS Alarm Silence BU Battery in Use LB Low Battery LM Loss of Pulse w/Motion LP Loss of Pulse MO Motion PH Pulse Rate High Limit Alarm PL Pulse Rate Low Limit Alarm PS Pulse Search SD Sensor Disconnect SH Sat High Limit Alarm SL Sat Low Limit Alarm - - - No Data Available * Alarm Parameter Being Violated

Note: A Sensor Disconnect will also cause three dashes (- - -) to be displayed in the patient data section of the printout.

10.5 NURSE CALL

An RS-232 Nurse Call signal can be obtained by connecting to the data port. This function is available only when the instrument is operating on AC power. The RS-232 Nurse Call will be disabled when the unit is operating on battery power.

The remote location will be signaled anytime there is an audible alarm. If the audible alarm has been turned off, or silenced, the RS-232 Nurse Call function is also turned off.

Pin 11 on the data port is the RS-232 Nurse Call signal and pin 10 is ground (see Figure 10-1). The voltage between pins 10 and 11 will be -5 volts DC to -12 volts DC or +5 volts DC to +12 volts DC depending on the option chosen in menu item 8. Whenever there is in an audible alarm, the output between pins 10 and 11 will reverse polarity.

An internal Nurse Call relay (pins 7, 8, and 15) provides dry contacts which can be used to signal a remote alarm. These contacts can be used if the instrument is operating on AC or on its internal battery. Pin 15 is common, pin 7 is normally open (N.O.), and pin 8 is normally closed (N.C). The rating of the contacts is shown in Table 10-4. Table 10-3 shows the state of the contacts for Alarm and No Alarm conditions, and for Instrument Off.

10-6


Table 10-3: Nurse Call Relay Pin States

Pin No Alarm Alarm Instrument Off 7 N.O. Open Closed Closed 8 N.C. Closed Open Open

Table 10-4: Rating of Nurse Call Relay

Maximum Input Voltage 30 volts AC or DC (polarity is not important) Load Current 120 mA continuous

(peak 300 mA @ 100 ms) Minimum Resistance 26 ohms to 50 ohms (40 ohms typical) during

alarms Ground Reference Isolated Ground Electrical Isolation 1500 volts

10.6 ANALOG OUTPUT

Analog outputs are provided for saturation, pulse rate, and a plethysmographic waveform. These outputs are available only if the monitor is operating on AC power.

The output voltage is 0.0 to +1.0 volts DC for all three parameters. A 1.0-volt DC output for saturation equals 100%, for pulse rate it equals 250 bpm, and for plethysmographic waveform it equals 255 pulse amplitude units (pau). The voltage will decrease as the values for these parameters decrease.

At power-up, after the completion of POST, a calibration signal will automatically be sent. This signal can be started manually by accessing menu item 14. The calibration signal will begin at 0.0 volts DC and hold that point for 60 seconds. It will then jump up to 1.0 volt DC and hold that value for 60 seconds. The third part of the calibration signal is a stair-step signal. The stair-step signal will start at 0.0 volts DC and increase up to 1.0 volt DC in 0.10-volt increments. Each increment will be held for 1 second.

10.7 INTERACTIVE MODE

Introduction

When the NPB-290 is connected to a PC through the data port, the Interactive Mode is accessible. If the Interactive Mode has been accessed, real-time serial output is stopped and serial input is accepted. The user can request printouts and set date and time through the use of the PC and the data port.

Accessing the Interactive Mode

The Interactive Mode can be accessed when the data port of the NPB-290 is connected with a serial cable to a PC. Paragraph 10.3 describes the pin outs and how to build a serial cable.

10-7


The Interactive Mode can be accessed from a standard keyboard on a PC by holding the control key down and pressing "C" twice. The PC monitor will display the five options that are available in the Interactive Mode. The five options are:

1. Dump Instrument Info

2. Set Date and Time

3. Dump Trend

4. Dump Error Log

5. Exit Interactive Mode

Interactive Mode Options

Pressing the corresponding number on the PC keyboard accesses options.

Option 1) Dump Instrument Info

Menu item 2 (Trend Clear), described in paragraph 4.3.3, allows the user to delete the most recent trend data. Deleted trends can still be retrieved from the instrument through an Instrument Info printout.

The Instrument Info printout (when connected to a printer) or PC display (when connected to a PC) will show the oldest deleted trend as Trend 01. If a Trend 01 already exists in memory from an earlier Delete, the next deleted trend will become Trend 02. Every time a trend is deleted the number of existing trends will increase by 1. The most recently deleted trend will have the largest trend number.

Figure 10-3 illustrates an Instrument Info printout. The first two lines are the Column Heading lines. Line one is for instrument type, software revision level, type of printout, and alarm parameter settings. The second line contains the column headings. A line of data is recorded for every 2 seconds of instrument operation. Up to 24 hours of instrument operation data can be recorded.

The final line on the printout is Output Complete. This indicates that data has been successfully transmitted with no corruption. If there is no Output Complete printed, the data should be considered invalid.

This option is intended for Mallinckrodt field service personnel.

10-8


NPB-290 Version 1.0.0.000 Instrument SpO2 Limit: 30-100% PR Limit: 100-180 bpm TIME Trend 01 %SpO2 PR (bpm) PA SpO2 Status User Interface Status

01-Jul-97 14:00:00 - - - - - - - - - SD BU LB AO L 01-Jul-97 14:00:02 - - - - - - - - - PS BU LB AO 01-Jul-97 14:00:04 100 120 220 BU LB 01-Jul-97 14:00:06 100 120 220 BU LB NPB-290 Version 1.0.0.000 Instrument SpO2 Limit: 80-100% PR Limit: 60-180 bpm TIME Trend 02 %SpO2 PR (bpm) PA SpO2 Status User Interface Status Au01-Jul-97 14:24:24 79* 58* 220 PS SL PL BU LB M 01-Jul-97 14:24:26 79* 57* 220 PS SL PL BU LB AS M 01-Jul-97 14:24:28 0* 0* - - - PS LP SL PL BU LB AS H NPB-290 Version 1.0.0.000 Instrument SpO2 Limit: 80-100% PR Limit: 60-180 bpm TIME Trend 03 %SpO2 PR (bpm) PA SpO2 Status User Interface Status

11-Jul-97 7:13:02 99 132* 220 PH BU M 11-Jul-97 7:13:05 99 132* 220 PH BU M 11-Jul-97 7:13:07 99 132* 220 PH BU M 11-Jul-97 7:13:09 99 132* 220 PH BU M 11-Jul-97 7:13:11 99 132* 220 PH BU M 11-Jul-97 7:13:13 99 132* 220 PH BU M 11-Jul-97 7:13:15 99 132* 220 PH BU M Output Complete

Figure 10-3: Instrument Info Printout

Option 2) Set Date and Time

When the instrument is sent from the factory, the date and time that have been entered are for Pacific Standard Time. If the battery has been disconnected or changed, the real-time clock will not reflect the actual time. For either of these reasons, it will be necessary to set the date and time. Selecting option 2 allows these settings to be entered from the PC keyboard.

The format for date and time is DD-MMM-YY HH:MM:SS. The hours, minutes, and seconds are entered in the 24-hour format. Move the cursor to the value that needs to be changed and enter the new value.

Option 3) Dump Trend

A Trend printout will include all data recorded for up to 24 hours of monitoring since the last trend delete was performed. A trend line is recorded every 2 seconds or whenever an alarm condition has occurred. The final line on the printout is Output Complete. This indicates that data has been successfully transmitted with no corruption. If there is no Output Complete printed, the data should be considered invalid. Figure 10-4 is an example of a Trend printout.

10-9


NPB-290 Version 1.0.0.000 TREND SpO2 Limit: 30-100% PR Limit: 100-180 bpm TIME %SpO2 PR (bpm) PA 01-Jul-97 14:00:00 100 120 220 01-Jul-97 14:00:02 100 124 220 01-Jul-97 14:00:04 100 190 220 01-Jul-97 14:00:06 100 190 220 01-Jul-97 18:00:43 - - - - - - - - - 01-Jul-97 18:00:45 - - - - - - - - - NPB-290 Version 1.0.0.000 Trend SpO2 Limit: 80-100% PR Limit: 60-180 bpm Time %SpO2 PR (bpm) PA 01-Jul-97 18:00:53 - - - - - - - - - 01-Jul-97 18:00:55 - - - - - - - - - 01-Jul-97 18:01:57 98 100 140 01-Jul-97 18:01:59 98 181* 190 01-Jul-97 18:02:01 99 122 232 Output Complete

Figure 10-4: Trend Printout

Option 4) Dump Error Log

A list of all the errors recorded in memory can be obtained by selecting Error Log Dump. The first two lines are the Column Headings lines. The type of instrument producing the printout, software level, type of printout, and the time of the printout are listed in the first line. The second line is printout column headings. The final line on the printout is Output Complete. This indicates that data has been successfully transmitted with no corruption. If there is no Output Complete printed, the data should be considered invalid. An example of an Error Log printout is shown in Figure 10-5.

This option is intended for Mallinckrodt field service personnel.

NPB-290 Version 1.0.0.000 Error Log Time: 14600:00:07 Op Time Error Task Addr Count 10713:21:03 52 12 48F9 100 00634:26:01 37 4 31A2 3 Output Complete

Figure 10-5: Error Log Printout

10-10

SECTION 11: TECHNICAL SUPPLEMENT

11.1 Introduction 11.2 Oximetry Overview 11.3 Circuit Analysis 11.4 Functional Overview 11.5 AC Input 11.6 Power Supply PCB Theory of Operation 11.7 Battery 11.8 User Interface 11.9 Front Panel Display PCB and Controls 11.10 Schematics Diagrams

11.1 INTRODUCTION

This Technical Supplement provides the reader with a discussion of oximetry principles and a more in-depth discussion of NPB-290 circuits. A functional overview and detailed circuit analysis is supported by block and schematic diagrams. The schematic diagrams are located at the end of this supplement.

11.2 OXIMETRY OVERVIEW

The NPB-290 is based on the principles of spectrophotometry and optical plethysmography. Optical plethysmography uses light absorption technology to reproduce waveforms produced by pulsatile blood. The changes that occur in the absorption of light due to vascular bed changes are reproduced by the pulse oximeter as plethysmographic waveforms.

Spectrophotometry uses various wavelengths of light to qualitatively measure light absorption through given substances. Many times each second, the NPB-290 passes red and infrared light into the sensor site and determines absorption. The measurements that are taken during the arterial pulse reflect absorption by arterial blood, nonpulsatile blood, and tissue. The measurements that are obtained between arterial pulses reflect absorption by nonpulsatile blood and tissue.

By correcting "during pulse" absorption for "between pulse" absorption, the NPB-290 determines red and infrared absorption by pulsatile arterial blood. Because oxyhemoglobin and deoxyhemoglobin differ in red and infrared absorption, this corrected measurement can be used to determine the percent of oxyhemoglobin in arterial blood: SpO2 is the ratio of corrected absorption at each wavelength.

11.2.1 Functional versus Fractional Saturation

The NPB-290 measures functional saturation, that is, oxygenated hemoglobin expressed as a percentage of the hemoglobin that is capable of transporting oxygen. It does not detect significant levels of dysfunctional hemoglobins. In contrast, hemoximeters such as the IL482 report fractional saturation, that is, oxygenated hemoglobin expressed as a percentage of all measured hemoglobin, including measured dysfunctional hemoglobins.

11-1

Section 11: Technical Supplement

Consequently, before comparing NPB-290 measurements with those obtained by an instrument that measures fractional saturation, measurements must be converted as follows:

functional saturation =

fractional saturation x

100100-(% carboxyhemoglobin +%methemoglobin)

11.2.2 Measured versus Calculated Saturation

When saturation is calculated from a blood gas measurement of the partial pressure of arterial oxygen (PO2), the calculated value may differ from the NPB-290 SpO2 measurement. This is because the calculated saturation may not have been corrected for the effects of variables that can shift the relationship between PaO2 and saturation.

Figure 11-1 illustrates the effect that variations in pH, temperature, partial pressure of carbon dioxide (PCO2), and concentrations of 2,3-DPG and fetal hemoglobin may have on the oxyhemoglobin dissociation curve.

Figure 11-1: Oxyhemoglobin Dissociation Curve

11.3 CIRCUIT ANALYSIS

The following paragraphs discuss the operation of each of the printed circuit boards within the NPB-290 pulse oximeter. (Refer to the appropriate schematic diagram at the end of this section, as necessary.)

11.4 FUNCTIONAL OVERVIEW

The monitor functional block diagram is shown in Figure 11-2. Most of the functions of the NPB-290 are performed on the User Interface PCB. Functions on the User Interface PCB include the SpO2 module, PIC, CPU, and Memory. Other key components of the NPB-290 are the Power Entry Module (PEM), Power Supply, and the Display printed circuit board (PCB).

11-2


The Display module consists of the LED display and the Membrane Panel. Contained on the Membrane Panel are annunciators and push buttons, allowing the user to access information and to select various available parameters. The Display PCB contains SpO2, heart rate, and Blip Bar LEDs, and their associated driver circuits.

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Figure 11-2: NPB-290 Functional Block Diagram

11.5 AC INPUT

A selector switch on the back of the NPB-290 allows the user to connect the monitor to AC power ranging from 100 volts AC to 240 volts AC. The switch has two positions, one for 100 volts AC through 120 volts AC and one for 200 volts AC through 240 volts AC. Verify that the switch selection matches the AC power at your location before plugging the monitor into an AC outlet.

AC power enters the NPB-290 through the Power Entry Module (PEM). A 0.5-amp fuse protects both the "Line" and "Neutral" lines. These user-accessible fuses are located in a fuse drawer, which is part of the PEM located on the back of the monitor.

11.6 POWER SUPPLY PCB THEORY OF OPERATION

The NPB-290 uses an unregulated linear power supply. This Power Supply provides the DC power needed to charge the battery and to power the User Interface PCB. Electro Static Discharge (ESD) protection is also provided by the power supply.

AC power from the PEM is passed through a step-down transformer, T2, which has two primary and two secondary windings. If switch SW1 on the back of the monitor is in the 120 VOLTS AC position, the primary windings are in parallel. The primary windings are in series if SW1 is in the 240 VOLTS AC position.

11-3


Each secondary winding is fused with a 2.0-amp fuse (F1 and F2). If a short circuit should occur in the DC circuitry, these fuses prevent the transformer from overheating. The output of the transformer varies, depending on load and input. Voltage measured between the outlet of a secondary winding and ground can be from 6 to 20 volts AC. High frequency noise from the AC line and from the User Interface PCB is filtered by C6 and C8 before passing through the bridge rectifier.

The bridge rectifier provides the DC power used in the NPB-290. The positive output is the MAIN_DC ranging from 7 to 18 volts DC. This positive voltage is used for the battery circuit and to power the User Interface PCB.

11.6.1 Battery Circuits

Two circuits are included in this section of the Power Supply PCB. One circuit is used to charge the battery, and the other circuit provides battery protection.

Charging Circuit

The power supply will charge the battery any time the NPB-290 is connected to AC power even if the monitor is not turned on. The voltage applied to the battery is 6.8 ± 0.15 volts DC and is current limited to 400 ± 80 mA.

Battery Protection

Two types of battery protection are provided by the power supply: protection for the battery and protection from the battery.

Switch SW2 is a resettable component that protects the battery. Switch SW2 opens and turns the charging circuit off if the temperature of the battery rises above 50° C. If the output of the battery exceeds 2.5 amps, F3 opens. Fuse F3 protects the battery from a short to ground of the battery output. Fuse F3 cannot be reset.

Protection from the battery is provided in case the battery is connected backwards. Should this happen, the output of the battery is shorted to ground through CR1 on the User Interface PCB. This provides protection for other circuits in the monitor.

11.7 BATTERY

A lead-acid battery is used in the NPB-290. It is rated at 6 volts DC, 4 amphours. When new and fully charged, the battery will operate the monitor for 8 hours. A new battery will last 15 minutes from the time the low battery alarm is declared until the unit is shut down due to battery depletion.

The battery can withstand 400 charge/discharge cycles. Recharging the battery to full capacity takes 14 hours in standby and 18 hours if being used.

Changing from AC to battery power will not interrupt the normal monitoring operation of the NPB-290. When the unit is running on battery power, the data port will be turned off along with the RS-232 Nurse Call. The Nurse Call relay will remain active.

11-4


11.8 USER INTERFACE PCB

The user interface PCB is the heart of the NPB-290. All functions except the unregulated DC power supply, display, and keypad reside on the user interface PCB. The following text covers the key circuits of the user interface PCB.

11.8.1 Regulated DC Power Supply

The User Interface PCB receives the MAIN_DC unregulated voltage of 7 to 18 volts DC from the power supply, or 5.8 to 6.5 volts DC from the internal battery. The power supply on the User Interface PCB generates +10.0, -5.0, and +5.0 volts DC.

11.8.2 Controlling Hardware

There are two microprocessors on the User Interface PCB. The CPU is a Motorola MC68331CF (331). The second microprocessor PIC16C63 is referred to as the PIC and is controlled by the CPU.

CPU

The 331 is the main controller of the NPB-290. The 331 controls the front panel display, data storage, instrument status, sound generation, and monitors and controls the instrument's power. The 331 also controls data port communication, the Nurse Call feature, and analog output.

Battery voltage is checked periodically by the processor. A signal from the processor turns the charging circuit off to allow this measurement to be taken. If the processor determines that the battery voltage is below 5.85 ± 0.1 volts DC, a low battery alarm is declared by the PIC. If battery voltage on the User Interface PCB is measured below 5.67 ± 0.1 volts DC, the monitor will display an error code and sound an audible alarm. (Voltages measured at the battery will be slightly higher than the values listed above.) The user will be unable to begin monitoring a patient if the battery voltage remains below this point. If either event occurs, plug the unit into an AC source for 14 hours to allow the battery to fully recharge.

When the NPB-290 is powered by AC, the RS-232 Nurse Call function is available. If no audible alarm conditions exist, the output will be -5 to -12 volts DC or +5 volts DC to +12 volts DC. These voltages are dependent upon the option selected in menu item 8. Should an audible alarm occur, the output would change polarity.

The 331 also controls a set of dry contacts provided by a relay on the User Interface PCB. The relay will function normally on AC power or on the internal battery power.

11-5


When the CPU sends a tone request, three items are used to determine the tone that is sent by the PIC to the speaker. First, pulse tones change with the %SpO2 value being measured. The pulse beep tone will rise and fall with the measured %SpO2 value. Second, three levels of alarms, each with its own tone, can occur: high, medium, and low priority. Third, the volume of the alarm is user adjustable. Alarm volume can be adjusted from level 1 to level 10, with level 10 being the highest volume.

User's interface includes the front panel display and the keypad. By pressing any of six keys on the keypad the operator can access different functions of the NPB-290. The 331 will recognize the keystroke and make the appropriate change to the monitor display to be viewed by the operator. Any changes made by the operator (i.e. alarm limits, pulse beep volume) are used by the monitor until it is turned off. Default values will be restored when the unit is turned back on.

Patient data is stored by the NPB-290 and can be downloaded to a printer through the data port provided on the back of the monitor. An in-depth discussion of the data port is covered in the Section 10 of this manual.

PIC Microprocessor

The PIC controls the SpO2 function and communicates the data to the 331.

A pulse width modulator (PWM) function built into the processor controls the SpO2 function. PWM signals are sent to control the intensity of the LEDs in the sensor and to control the gain of the amplifiers receiving the return signals from the photodetector in the sensor.

Analog signals are received from the SpO2 circuit on the User Interface PCB. An A/D (Analog to Digital) function in the PIC converts these signals to digital values for %SpO2 and heart rate. The values are sent to the 331 to be displayed and stored.

11.8.3 Sensor Output/LED Control

The SpO2 analog circuitry controls the red and infrared (IR) LEDs such that the received signals are within the dynamic range of the input amplifier. Because excessive current to the LEDs will induce changes in their spectral output, it is sometimes necessary to increase the amplification of the received signal channel. To that point, the PIC controls both the current to the LEDs and the amplification in the signal channel.

At initialization of transmission, the LED intensity level is based on previous running conditions, and the transmission intensity is adjusted until the received signals match the range of the A/D converter. If the LEDs reach maximum output without the necessary signal strength, the PWMs will increase the channel gain. The PWM lines will select either a change in the LED current or signal gain, but will not do both simultaneously.

11-6


The LED drive circuit switches between red and IR transmission and disables both for a time between transmissions in order to provide a no-transmission reference. To prevent excessive heat buildup and prolong battery life, each LED is on for only a small portion of the duty cycle. Also, the frequency of switching is well above that of motion artifact and not a harmonic of known AC transmissions. The IR transmission alone, and the red transmission alone, will each be on for about one-fifth of the duty cycle; this cycle is controlled by the PIC microprocessor.

11.8.4 Input Conditioning

Input to the SpO2 analog circuit is the current output of the sensor photodiode. In order to condition the signal current, it is necessary to convert the current to voltage.

Because the IR and red signals are absorbed differently by body tissue, their received signal intensities are at different levels. Therefore, the IR and red signals must be demodulated and then amplified separately in order to compare them to each other. Demultiplexing is accomplished by means of two circuits that alternately select the IR and red signal. Two switches that are coordinated with the IR and red transmissions control selection of the circuits. A filter with large time constant follows to smooth the signal and remove noise before amplification.

11.8.5 Signal Gain

The separated IR and red signals are amplified so that their DC values are within the range of the A/D converter. Because the received IR and red signals are typically at different current levels, the signal gain circuits provide independent amplification for each signal as needed. The gain in these circuits is adjusted by means of the PWM lines from the PIC.

After the IR and red signals are amplified, they are filtered to improve the signal-to-noise ratio and clamped to a reference voltage to prevent the combined AC and DC signal from exceeding an acceptable input voltage from the A/D converter.

11.8.6 Variable Gain Circuits

The two variable gain circuits are functionally equivalent. The gain of each circuit is contingent upon the signal's received level and is controlled to bring each signal to approximately 3.5 volts. Each circuit uses an amplifier and one switch in the triple single-poll double-throw (SPDT) analog-multiplexing unit.

11.8.7 AC Ranging

In order to measure a specified level of oxygen saturation and to still use a standard type combined processor and A/D converter, the DC offset is subtracted from each signal. The DC offsets are subtracted by using an analog switch to set the mean signal value to the mean of the range of the A/D converter whenever necessary. The AC modulation is then superimposed upon that DC level. This is also known as AC ranging.

11-7


Each AC signal is subsequently amplified such that its peak-to-peak values span one-fifth of the range of the A/D converter. The amplified AC signals are then filtered to remove the residual effects of the PWM modulations and, finally, are input to the PIC. The combined AC and DC signals for both IR and red signals are separately input to the A/D converter.

11.8.8 Real-Time Clock (RTC)

Real time is tracked by the NPB-290. As long as battery power or AC power is available, the instrument will keep time. If the battery is removed, the time clock will have to be reset.

11.8.9 Storage of Patient Data

Whenever the NPB-290 is turned on, it stores a "data point" in memory every 2 seconds (regardless of whether the NPB-290 is monitoring a patient or not). Up to 50 alarm limit changes will also be stored in trend data. The NPB-290 can store up to 24 hours of trend data. The 24 hours of stored trend data are available for downloading to Score software for 45 days. There are no limitations on displaying or printing data.

Caution: Changing alarm limit settings uses up trend memory space. Change alarm limits only as needed.

Note: Trend memory always contains the MOST RECENT 24 hours of data, with newly collected data over-writing the oldest data on a rolling basis. The NPB-290 continues to record data points as long as the monitor is powered on, with "blank" data points collected if no sensor is connected to the monitor or patient. "Blank" data will over-write older patient data if the memory becomes full. Therefore, if you want to save old patient data, it is important that you turn your monitor off when you are not monitoring a patient, and that you download the trend memory, using Score software, before it fills up and over-writes the old data with new data (or "blank" data).

Note: When using Score software use the latest version. Contact Mallinckrodt's Technical Services Department or your local Mallinckrodt representative to determine the latest version of Score software.

If battery power is disconnected or depleted, trend data and user settings will be lost. All data is stored with error detection coding. If data stored in memory is found to be corrupted, it is discarded.

11.9 FRONT PANEL DISPLAY PCB AND CONTROLS

11.9.1 Display PCB

Visual patient data and monitor status is provided by the Front Panel Display PCB. At power up, all indicators are illuminated to allow verification of their proper operation.

There are two sets of three 7-segment displays. One set displays %SpO2 and the other displays pulse rate. A decimal point immediately to the right of either display indicates that an alarm limit for that parameter is no longer set at the power-on default value.

11-8


Between the two 7-segment displays is a 10-segment blip bar. The blip bar illuminates with each pulse beat. The number of segments illuminated indicates the relative signal strength of the pulse beat. A tone will accompany each pulse beat. The sound of the tone will change pitch with the %SpO2 level being measured.

Five LEDs and icons are also located on the Front Panel Display PCB. An LED illuminated next to an icon indicates a function that is active. Functions indicated by the LEDs are AC/Battery Charging, Low Battery, Alarm Silence, Motion, and Pulse Search.

11.9.2 Membrane Keypad

A membrane keypad is mounted as part of the top case. A ribbon cable from the keypad passes through the top case and connects to the User Interface PCB. Six keys allow the operator to access different functions of the NPB-290.

These keys allow the user to select and adjust the alarm limits, cycle power to the unit, and to silence the alarm. Alarm volume and alarm silence duration can also be adjusted via the keypad. A number of other functions can be accessed by pressing the Upper and Lower Alarm Limit buttons simultaneously and then selecting the desired option with the Adjust Up or Adjust Down button. These functions are discussed in greater detail in Section 4.

11.10 SCHEMATIC DIAGRAMS

The following schematics are included in this section:

Figure 11-3: User Interface PCB Front End Red/IR Schematic Diagram Figure 11-4: Front End LED Drive Schematic Diagram Figure 11-5: Front End Power Supply Schematic Diagram Figure 11-6: SIP/SOP Isolation Barrier Schematic Diagram Figure 11-7: Data Port Drivers and Analog Output Schematic Diagram Figure 11-8: User Interface PCB MC331 Core Schematic Diagram Figure 11-9: User Interface PCB MC331 Memory Schematic Diagram B Figure 11-10: Speaker Driver Schematic Diagram A Figure 11-11: User Interface PCB Power Supply Schematic Diagram B Figure 11-12: Display Interface Schematic Diagram Figure 11-13: Parts Locator Diagram for USER INTERFACE PCB Figure 11-14: Power Supply Schematic Diagram Figure 11-15: Power Supply Parts Locator Diagram Figure 11-16: Display PCB Schematic Diagram Figure 11-17: Display PCB Parts Locator Diagram

11-9

11-11

Figure 11-3 UIF PCB Front End Red/IR Schematic Diagram

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VSS 8

VEE 7

VCC 16INH6

C9B10A1111

109

6 16

7

8

14

1312 15

21

4

53

PIC_RB5PIC_RB4PIC_RB3

PIC_RA1PIC_RA0

VREF

Z5UC4

0.1U

50V

0.033UC67

J16CON_SPO2

98765432

1413121110

1

16

15

98765432

1413121110

1

16

15

I47

U1

CD4053S

Z13Z05

Z 4

Y11Y02

Y 15XO12

X113

X 14

VSS 8

VEE 7

VCC 16INH6

C9B10A11

35

4

12

151213

14

8

7

166

91011Q8

2MPSA56S

3

11

3

2

I48

Q3

2

13

2N3904S2

13

I49

I50

I54

I56I57

I58

I59 I60

I61I62

I63

I64

I65

I66

0.1UC68

U31LT1013S

-

+

+

-2

67

8

1

U31

-

+

+

-

LT1013S

3

4

56

2

C10.47U20V

+

C690.1U

0.1UC70

0.1UC71

C720.1U

VREF

Q242N3906S

2

311

3

2

Q9 2MPSA56S

3

1

2

3

1

VREF

C730.1U

Q1

2

3

MPSA06S1

2

3

1

Q252N3906S

2

311

3

2

C7633P

VREF

I67

I68

I69 I70

I71

VREF

I72

Q2

2

3

MPSA06S1

2

3

1

I73

I74

I75

I79I80

I81

-5V

I83

I84

I85

I87I88

I89

10.0KR70

PIC_RB2

PIC_RB6

I78

Q112N3906S

2

311

3

2

VCC

I82

PIC_RB7

I298

I93

I302

49.9KR188 VREF

+10V

20.0KR71

R6520.0K

R19210.0K

R5210.0K

R5910.0K

I91

MISOMOSI

Figure 11-4 Front End LED Drive Schematic Diagram

035350

11-15

Figure 11-5 Front End Power Supply Schematic Diagram

SH9 (CONTRAST)

SH9 (CONTRAST)

HIGH CURRENT

RESETLU4

74HC00S

810

9

R8810.0K

4.99KR82

50V330PC78

PIC_10MHZ

I107I106

I109

I101

CLK_312KHZ

CLK_312KHZ

CLK_156KHZ

CLK_156KHZ

I110

I103

U51

74HC4520S

VCC

RSTQ3Q2Q1Q0

GND

CP1

CP01

2

8

3456

7

16

VDD

RAW+10V

RAW-5V

RAW-5V

RAW-10V

RAW-10V

U51

74HC4520S

VCC

RSTQ3Q2Q1Q0

GND

CP1

CP09

10

8

11121314

15

16

I104C70.1UZ5U

I127

VCC

I97

I99

VCC10V47UC36

+

C4147U10V

+

C3547U10V +

20V

C3822U

+

C4047U10V

+

I119

-10V

C3447U10V

+-5VTP4I117

TP5I126

VFB

I116

VSW

VIN

I96

TP3

I98

I100

I105

5%

C771000P

Z5U

C80.1U

11.5KR77

U50

FB 2

GND7

6 GNDS

NFB 3

4 S/S

VC1 VIN 5

VSW 8

LT1373S

8

51

4

3

6

7

2

49.9R79

U12

2 GND13 GND2

6GND37GND4

VIN8 1VOUT

78L05D

18

76

32

+10V

20V

C3722U

+

182R80

CR2MBRS130

122 1

49.9R81

22UC39

20V

+

CR111N914S

133

1

R8349.9

MBRS130

CR3

12 12

CR4

MBRS130

1 22149.9R86

C4222U

20V+

VCC

0.1UC9

Z5U

Z5U

C100.1U

0.1UC11

Z5U

Z5U

C120.1U

5%1.0R87

AGNDTP2

T2

4

5

1

8 3

6

7

2

LPE-4841

4

5

1

8 3

6

7

2

I108

C3210U16V

+

VCC

I113

CR5MBRS130

122 1

20V

C4322U

+

CR6

MBRS130

1 221

I114

I115

0.1UC13

Z5U

I118 TP6 VREF

I120

I121

R7834.8K

10V47UC33

+

TP7

I320

035350

11-17

Figure 11-6 SIP/SOP Isolation Barrier Schematic Diagram

SIP/SOP Interface

10.0KR109

R16310.0K

10.0KR176

R19510.0K

10.0KR173

10.0KR171

R1701.00K

R1691.00K

4.99KR166

50V330PC79

NC_NC

NC_NO

I155

100R167

VD

D

I162

I

SIPSOP_EN

VDD

RXD

NC_RELAY

ITX485_EN

Q6SI9936

7

1

8

2

I143

VDDR175681TXD

VDD

VDD

SDA

VDD

SCL

NC_COM

I146

U6N.C.

AQV414A

546

211

52

64

RCV_485

RCV_232

IVDD

IVDD

VDD

Z5U

C180.1U

VDDT1

COILCRAFT Q4470-B

61

2

3 4

55

43

2

1 6

I150

VDD

U14

74HC14S

9

14

7

8

I

I148

I149Q6SI9936

5

3

6

4

C4547U10V

+

IVDD

681R172

R174681

IVDD

U17 TH

6N1367

6

8

2

3 5

2

3 57

8

6

I163

THU19

6N1367

6

8

2

3 5

2

3 57

8

6

I160

I159

ISCL

I156

I154

I152

I147

I140

I139I138

I135

I134

U9

74HC10S

91011

8

U9

74HC10S

345

6

Z5U

C160.1U

0.1UC15

Z5UZ5U

C140.1U

IVDDIVDD

VDD

R177453

Q272N3906S

2

311

3

2

Q262N3906S

2

311

3

2

I

I

IVDD

I

IVDD

II

IVDD

IVDD

IVDD

U1574HC14S

9

14

7

8

U1574HC14S

13

14

7

12

U1574HC14S

11

14

7

10

U1574HC14S

3

14

7

4

I

I

THU18

6N1367

6

8

2

3 5

2

3 57

8

6

U7N.O.

AQV210EHA

546

211

52

64

IC4447U10V

+

VDDVDD

CR8

MBRS130

122 1

C4647U10V

+

U49

GND2

42

GND1

3OUT

LT1129CST-51 IN1 3

2 4

U20TH

6N1367

6

8

2

35

2

357

8

6

U1574HC14S

1

14

7

2

U1574HC14S

5

14

7

6

IVDD

IVDD IVDD

I

II

VDD

R165453

U14

74HC14S

1

14

7

2

VDD

U1474HC14S

5

14

7

6

U14

74HC14S

13

14

7

12

VDDVDD

0.1UC17

Z5U0.1UC19

Z5U

U9

74HC10S

12

1312

CLK_156KHZ

U14

74HC14S

11

14

7

10

I132

U1474HC14S

3

14

7

4

VDD

I141

I137I136

I133

I142

CR7

MBRS130

122 1I151

I161 I158

I164

I165

ITXD

ISDA

R194681

I

THU54

6N1367

6

8

2

3 5

2

3 57

8

6

TX485_EN

I153

VDD

100R168

C80330P50V

10.0KR110

R16410.0K

035350

11-19

Figure 11-7 Data Port Drivers and Analog Output Schematic Diagram

8 BIT DAC

RS-485 DRIVER

Analog Outputs

RXD+

RXD+

RXD-

RXD-

I

I

I

AN_PULSE

AN_PULSE

0.1UC93

Z5U

I

0.1UC26

Z5U

IVDD

TXD_232

TXD_232

RXD_232

RXD_232

ADM202EU5

CMOS LEVEL

C1+1

C1-3

C2+4

C2-5

GND

15

R1IN 13R1OUT12

8R2IN9 R2OUT

11 T1IN 14T1OUT

10 T2IN 7T2OUT

2

V+

V-

6

16

VCC

RS232 LEVEL

7

1411

12

9

10

1

34

5

15

8

162

6

13

10VCR9

SMCJ10C

2 112

NC_COM

NC_COM

I243

I244

I

NC_LVL

NC_LVL

IVDD

CR26

21

3

BA

V9

9

3

1 2

CR19

21

3

BA

V9

9

3

1 2

I

0.1UC25

Z5U

ITX485_EN

ITXD

ITXD

I242

I240

U13MAX520S

OUT0 2

OUT2 16

OUT1 1

OUT3 15

5 AGND

6 DGND

VDD12 REF0 4

REF1 3

REF2 14

REF3 13

11 AD2

AD110

AD09

SDA8

SCL7

2

16

1

15

5

6

12 4

3

14

13

11

10

9

8

7

4.02K0.1%

R180

NC_NC

NC_NC

NC_NO

NC_NO

J1

CON_DB15FTH

16

1

8

7

6

5

4

3

15

2

14

13

12

11

10

9

1717

9

10

11

12

13

14

2

15

3

4

5

6

7

8

1

16

R191

TH1/4W100M

I177

R1831.00K

I176

AN1

I175AN0

I173

I174I170

REF_1V

II

47U10V

C47+

I1691.00KR179

Z5U

C270.1U

DT1

TH600V

20V1.0U

C83+

20V1.0UC81

+

20V1.0U

C82+

CR16

21

3

BA

V9

9

3

1 2

CR1521

3

BA

V9

93

1 2

CR14

21

3

BA

V9

93

1 2

R1821.00K

II

RCV_485

IVDD

I

I

IVDD

I

I

I

I

IVDD

IVDD

IVDD

IVDD

IVDD

I

I

I

II

I

IVDD

IVDD

IVDD

I

IISDA

0.1%6.04KR181

U32

-

+

+

-

LT1013S

1

8

76

2AN2

U32

-

+

+

-

LT1013S

3

4

56

2

R178

1.00K

CR12

21

3

BA

V9

93

1 2

U47

-

+

+

-

LT1013S

3

4

56

2

CR13

21

3

BA

V9

9

3

1 2

U8

TLE2425CD

VOUT 1

GND

2

VIN33

2

1

U47

-

+

+

-

LT1013S

1

8

76

2

I

Z5U

C210.1U

0.1UC20

Z5U

TH

F1 500MA

Z5U

0.1UC23

I167

I168

ISCL

I171

I172

I178

TXD+

TXD+

TXD-

TXD-

I166

RCV_232

RCV_232

I241

Z5U

C240.1U

0.1UC22

Z5U

I238

NC_232

NC_232

U16

11RXIN-

GND1

6 7

GND2

RSENAB3

2 RSROUT12RXIN+

TXENAB4

TXIN59TXOUT+

10TXOUT-

VCC

14MAX489

14

10

95

4

122

3

76

11

Z5U

C970.1U

AN_SPO2

AN_SPO2

Z5U

C1450.1U

AN_PLETH

AN_PLETH

E

035350

11-21

Figure 11-8 UIF PCB MC331 Core Schematic Diagram

035350

RRAMHCSL

I342

RBOOTROML

I341

I340

RRAMLCSL

RDSPLCSL

Note: One ICT per Rpack

BACKGROUND DEBUG CONNECTOR

REAL TIME CLOCK

battery backed powerFrom Power Supply

I327

I344 I319

I125

L4 A601

L1 A601

SDAB601L10

L5 B601

B601L7

B601L8

L6 B601

B601L2

L3 A601U45

60XTAL

64XFC

VSS96759 VSS8

VSS75140 VSS6

VSS53429 VSS4

VSS3178 VSS2

VSS15127117 VSS14

VSS13106101 VSS12

VSS119583 VSS10

VSS12

61VDDSYN

84 VDD9VDD865

63 VDD7VDD650

39 VDD5VDD428

18 VDD3VDD27

126 VDD13VDD12116

107 VDD11VDD1096

1 VDD1

52 TXD

80SIZ1

81SIZ0

45 SCK

53 RXD

79R-/W

PWMB129130 PWMA

PCLK1284 PAI

6 OC4

10 OC3OC211

12 OC1

44 MOSI

78MODCLK

43 MISO

54IPIPE-DSO55IFETCH-DSI

IC4/OC55IC313

14 IC2IC115

58FREEZE-QUOT

118FCO-/CS3

120FC2-/CS5

119FC1-/CS4

62EXTAL

99D9

100D8

102D7

103D6

104D5

105D4

108D3

109D2

91D15

92D14

93D13

94D12

97D11

98D10

110D1

111D0

66CLKOUT

A9 3027A8

A7 2625A6

A5 2423A4

A3 22

125A23-/CS10

124A22-/CS9

123A21-/CS8

122A20-/CS7

21A2

121A19-/CS6

42A18A17 41

38A16A15 37

36A14A13 35

33A12A11 32

31A10

A1 2090A0

57/TSTIME-TSC

/RMC 86

/RESET68

49 /PCS3

48 /PCS2

47 /PCS1

46 /PCS0-/SS

71 /IRQ7

72 /IRQ6

73 /IRQ5

74 /IRQ4

75 /IRQ3

76 /IRQ2

77 /IRQ1

69 /HALT

88/DSACK1/DSACK0 89

85/DS

112/CSBOOT113/BR-/CS0

56/BKPT-DSCLK

115/BGACK-/CS2

114/BG-/CS1

70 /BERR

87 /AVEC

82/AS

68331

60

64

67595140342917

8

127117106101

9583

2

61

84656350392818

7

126116107

96

1

52

8081

45

53

79

129130

1284

6101112

44

78

43

5455

5131415

58

118

120119

62

99100102103104105108109

919293949798

110111

66

30272625242322

125124123122

21

121424138373635333231

2090

57

86

68

49484746

71727374757677

69

8889

85

112113

56

115114

70

87

82

I209RA1

I328

I124

SCK

VDD

SIPSOP_EN

RP910K

1 2 3 4

8 7 6 55678

4321

10KRP10

1 2 3 4

8 7 6 55678

4321

R184121

BATLEDDR

49.9K

R89

I316

BK-LT-ONL

FONTSEL

PSLEDDR

I312

I239

Y3

32

.76

8K

HZ

14

EC

PS

M2

9T

41

SERCLKSERDATA

RPBCSLRDSPLRDL

BKPTL

RESETL R153221

I245

AC_LED

DISP_EN

RTCSELBTN_PRS_L

MISOMOSI

I208

I205

I207

POTCSL

J15

8642

7531

CON_BDM8

8642

7531

CRIT_BATT-L

SDA2SDA2ASL

I201

I204

VDD

R14910.0M

I281

I282

D8D7D6D5D4D3D2D1D0

D[0:15]

D9D10D11D12D13D14D15

120RP1

910111213141516

87654321

910111213141516

87654321

RP2120

910111213141516

8765432112345678

16151413121110

9

CR29

VC1206

5.6V

122 1

I237

10V47UC137+

RP16120

87654

3211 8

121 R152

121 R186

121 R96

Z5U

0.1UC131

X7R0.1UC128

08050805

C1260.1U

X7RX7R0.1UC123

08050805

C1270.1U

X7RX7R0.1UC121

0805

0805

C1240.1U

X7R0805

C1250.1U

X7RX7R0.1UC134

08050805

C1330.1U

X7RX7R0.1UC135

08050805

C1220.1U

X7R

VDD

C13822P50V

C14022P50V

POTCSL

VD

D

FRONT_END_RST

I112

I131

RESETL

U46

~RST 6

RST 5

LTC1232

VCC 8

TOL3

TD2 ST 7

PBRST1

GND4

6

5

8

3

2 7

1

4

RWD_RST

I234

XFC

I233

Y132.768KHZ

14

ECPSM29T

14

I235

R150332K

I212

I213

I179

RWD_RST

RXD

HALTLBERRL

I130I129

VDD

CLRIII

Z5U0.1UC139

Z5U0.1UC132

DSACK0

I306 I308

I232

I231

TP58

Z5U0.1UC130

10K

RP11

1 2 3 4

8 7 6 55678

4321

RP6

10K1 2 3 4

8 7 6 5

1 2 3 4

8 7 6 5

10UC136

16V

+

VDD

I229I228

I236

I279

I197

I307

DSLDSACK1

RA0RA1

RA10RA11RA12RA13RA14RA15RA16

RA2

ASLEDDR

RROMLATECSL

RA3RA4RA5RA6RA7RA8RA9

CLKOUT

IPIPE0

VDDI

R/WLR

VDDI

VDDSYN

RA17

A1A2A3A4A5A6A7A8

A12A11A10A9

A15A14A13

A0

A[17:0]A17

A16

I210

I102

VDD

RAMPWRTP59

FREEZEVDDI

IPIPE1

AC_OK-LLOW_BATT-L

MOTNLEDDR

PWM_FREQ

R/WL

TURN_OFF

0.01UC141

VDD

R1351.00K

R151221

I128

PWM_VOL

I230

SERDATASERCLK

RTCSEL

I198

SCL

SCL

U43

DS1302Z

1PWR2

GND 4

PWR18

7 SCLK

3 X2

6 I/ORST5

2 X12

56

3

7

8

4

1

U38 128X8

A01

A12

A23

GND 4

PWR 86 SCL

SDA5

WP7

AT24C01A

7

5

6 8

4

321

I313

WD_RST

MAN_RST

0805

C1200.1U

X7R X7R0.1UC129

0805

ROMLATECSL

121R105

DSPLRDL

DSPLYCSLRAMHCSL

BOOTROMLRAMLCSL

I219

50V4.7PC144

4.99KR155

VDD

RA17

RPBCSLRDSPLRDL

RROMLATECSL

R/WLR

RDSPLCSL

RA13

RESETL

BKPTLFREEZEIPIPE1IPIPE0

I324

PBCSL

I335

I336

BATT_CHECK

NC_RELAY

TX485_EN

TXD

B601L9SCL

IRQ7L

I343

PCS0L

11-23

Figure 11-9 UIF PCB MC331 Memory Schematic Diagram B

035350

U42

RY2

FLASH29F200

31D15

32GND2GND1 13

D9 18D8 16

30D7

28D6

26D5

24D4

21D3

19D2

D14 29D13 27

D11 22D10 20

17D1

15D0

12 CE

5 A6

6 A5

7 A4

38 A12

39 A11

11 A0

128KX1623

PWR

9 A2

10 A1

8 A3

40 A10

42 A8

4 A7

41 A9

37 A1336 A1435 A15

14 OE

D12 25

34 A16

33 BYTE

WE43

44RESET

231

3213

1816302826242119

2927

2220

1715

12

567

3839

11 23

910

8

40

424

41

373635

14

25

34

33

43

44

L12A601

B601L11

FLASHPWR

I337

D[15:0]

D10D2D9

D11D3

D1D8D0

D[15:0]

D8D9D10D11D12D13D14D15 D7

D6D5

D0D1

D3D4

D15D7D14D6D13D5D12D4

I338

TP55

FLSHOEL

I196

u40

74HC32S

32

1

U40

74HC32S

1113

12

120RP3

910111213141516

87654321

910111213141516

87654321

RP4 120

910111213141516

87654321

910111213141516

87654321

D15

RAMOEDIS

10.0KR156

R/WL R/WL

R/WL

R/WL

RAMLCSL

RAMLCSL

RESETL

RESETL

RESETL

RESETL

10.0KR147

VDD

VDD

BOOTFLSHL

BOOTFLSHL

I278

121R146

ROMLATECSL

A17

A[17:0]

A1A2A3A4A5A6A7A8A9A10A11A12A13A14A15A16A17

A17

A11

A[17:0]

A1A2A3A4A5A6A7A8A9A10

A12A13A14A15A16

A1A2A3A4A5A6A7A8A9A10A11A12A13A14A15A16

I195

VDD

C1010.1UZ5U

BOOTROML

I318

I295

I246

16V10UC118+

I280

D2

I264

A16

I263

D0D1

I261I262

I265I266I267I268

I269I270I271I272

I273I274I275I276

D3D2

D7D6D5D4

D11D10

D9D8

D14D13D12

A2

A14A13A12A11A10

A9A8A7A6A5A4A3

I247I248

I249I250I251I252

I253I254I255I256

I258I259I260

A1

10V47U

C119+

VDD

J14

CON_3X2

6543211

35

246

W-RL

A15 I257

R14810.0K

U41 128KX8

431000S

29 WE

32PWR

24 OE16GND

21D7

20D6

19D5

18D4

17D3

15D2

14D1

13D0

22 CEL30 CEH

26 A9

27 A8

5 A7

6 A6

7 A5

8 A4

9 A3

10 A2

2 A16

31 A15

3 A14

28 A13

4 A12

25 A11

23 A10

11 A1

12 A0

29

32

2416

2120191817151413

2230

2627

56789

10

231

328

42523

1112

Z5U0.1UC28

U21 128KX8

431000S

29 WE

32PWR

24 OE16

GND

21D7

20D6

19D5

18D4

17D3

15D2

14D1

13D0

22 CEL30 CEH

26 A9

27 A8

5 A7

6 A6

7 A5

8 A4

9 A3

10 A2

2 A16

31 A15

3 A14

28 A13

4 A12

25 A11

23 A10

11 A1

12 A0

29

32

2416

2120191817151413

2230

2627

56789

10

231

328

42523

1112

RAMHCSL

RAMHCSL

U4

74HC00S

32

1

I111A17

C910.1UZ5U

I144

I227

74HC32S

U40

65

4

74HC32S

U409

108 I94I180

FRAMPWR

I339

RAMPWR

11-25

Figure 11-10 Speaker Driver Schematic Diagram A

035350

J13

2112

1.00KR101

1.00KR92

100KR102

R98249K

R934.99K

C10547U10V

+

U56

-

+

+

-

TLC27L2

6

57

8

4

U56

-

+

+

-

TLC27L2

2

31

8

4

I199

PWM_VOL

VDD

R10010.0K

I309

PWM_FREQ

I310

I200

R996.49K

C880.1U

U266GND1

7 N.C.

1 VCC

VI22

VI44VO1 5

VO2 8

TDA7052A

TH

3GND2

85

6

24

1

37

C961.0U20V

+

VDD

VDD

I311I315

I321

10V47UC104+ C106

47U10V

+C11047U10V

+

11-27

Figure 11-11 UIF PCB Power Supply Schematic Diagram B

035350

Low at approx 5.85V

Critical at approx 5.68V

Active Low Indicator

Normally HIGH, active LOW

Normally HIGH, active LOW

Open Collector Output

To Linear Power Supply

35V1UC109+

R10410.0K

10.0KR130

10.0KR129

10.0KR111

10.0KR106

R12010.0K

3_3V

10.0KR126

10.0KR115

20.0KR112

C115

20V1.0U

+

0.1UC114

0.1UC116

C1130.1U

U33LT1121CZ

OUT 1IN3

GND

2

13

2

CR28

13

1N

91

4S

13

CR27

1 3

1N914S

31

VDD

TP41

AC_OK-L

TP46

I322

10.0KR204

I215 VDD

100KR113

100KR116

U35

-

+

+

-

LM393S

3

2

8

4

1

R20310.0M

MAIN_OUT

MAIN_OUT

VDD

3_3V

R107200K

100KR114

MAIN_DC1

CR30

MBRS330T3

122 1

10.0MR202

249KR119

CR1

BAT54

3 113

6.81KR108

R9110.0M

CR17

MBRS330T3

12 12

C107470U16VTH

+

CR

31

VC

12

06

5.6

V

122

1

1N914SCR18

133 1

I202

3_3V

3_3V

I192

I185

I190

I181

TURN_OFF

I182

R10349.9K

C1110.1U

Q17

2

13

2N3904S2

1349.9K

R131

20.0KR121

3_3V

U29

74HC74S

Q

VCCQ

PRE

GND

D

CLR

CLK11

13

12

7

10914

8

RAMPWR

CR

21

MB

RS

13

0

12

12

VDD

VDD

U28

-

+

+

-

LM393S

7

4

8

6

5

U28

-

+

+

-

LM393S

3

2

8

4

1V_REF

U35

-

+

+

-

LM393S

7

4

8

6

5

GNDVIAHG2HG1

GNDVIA

GNDTP39

U363OUT1 IN

5

HSG1

2

CS

4

LM2940H

TH 4

1 3

2 5

3.3VTP1

C10810U16V

+

MBRS130

CR20

122 1

TP13

TP43

TP42

I218

TP47

I216

CON_4L_156

J6

43211234

LOW_BATT-L

VDD

R1184.99K

150K

R122

U37LT1009S

4

5

68

4.99KR124

R125100K

R128

4.99K

VDDTP38

I217

I220

Q14

2

13

2N3904S2

13

Q13

2

13

2N3904S2

1349.9K

R97

Q15

2

13

2N3904S2

13

49.9KR127

3_3V

ONBUTTON

U29

74HC74S

Q

VCCQ

PRE

GND

D

CLR

CLK3

1

2

7

4514

6

BATT_CHECKC112

0.1U

C860.1U

0.1UC85

Q16SI9953

1

2

78

SI9953

Q16

3

4

56

I183

I184

I186

I187

CLRIII

I188

I189 I191

I193

I194

I203

BTN_PRS_L

CRIT_BATT-L

BATT

R123200K

R20510.0M

I323

AC_OK

3_3V

11-29

Figure 11-12 Display Interface Schematic Diagram

035350

filter cap for U24, U34

290 MEMBRANE PANEL CONNECTOR

TO LED DISPLAY

A0

DSPLRDL

I290

RESETL

I277

DSPLYCSL

DISP_EN

U34

DIR

A8A7A6A5A4A3A2A1 B1

B2B3B4B5B6B7B8

G

74HC245S

2

9876543

191

1112131415161718

U24

74HC08S

2

13

U24

74HC08S

10

98

120RP5

910111213141516

87654321

910111213141516

87654321

DD2DD0

DD6DD4

DD1

DD7DD5DD3

DD[7:0]

DD0DD1DD2DD3DD4DD5DD6DD7

BDSPLYCSL

U24

74HC08S

13

1211

ASLED

MOTNLEDUP_LIMIT

ACPWRLED

U4

74HC00S

65

4

U4

74HC00S

12

1311

VDD

I293

I145

Z5U0.1UC29

ONBUTTON

ONBUTTON

AC_OK

AC_OK

I288

10KRP8

1 2 3 4

8 7 6 5

1 2 3 4

8 7 6 5

10KRP7

1 2 3 4

8 7 6 55678

4321

200KR189

J8

CON_FLEX17

1

1011 1213 1415 1617

24

5 67 89 10

121416

23 4

68

I284

ACPWRLED

82.5R145

249R137

Z5U0.1UC99

I214

PSLED

MOTNLED

ASLED

R134249

R133249

R14410.0K

R1324.99K

3_3V

R143100K

I299I300

R1424.99K

I297

PSLEDDR

MOTNLEDDR

VDD

I289

I285Q282N3906S

2

31

2

31

4.99KR140

Q202N3906S

2

31

2

31

VDD

U39

DIR

A8A7A6A5A4A3A2A1 B1

B2B3B4B5B6B7B8

G

74HC245S

2

9876543

191

1112131415161718

CR23

1 3

1N914S

31

CR22

1 3

1N914S

31

Q23

3

21 2N7002S

3

21

Q222N3906S

2

31

2

31

VDD

I286I287

Q212N3906S

2

31

2

31

Q192N3906S

2

31

2

31

ASLEDDR

BATLEDDR

C1000.1UZ5U

VDD

4.99KR141

I296V

DD

4.99KR187

I122

I123

249R138

I221

BATLED

ALRMSIL

DOWN_LIMIT

UP_BTN

BATLEDVDD

C1020.1UZ5U

R8410.0K

J2

CON_7X2

98765432

1413121110

11

1011 1213 14

23 45 67 89

I294

Q5SI9933

3

4

56

Q5SI9933

1

2

78

I292

AC_LED

AC_LED

I325

PSLED DOWN_BTN

U24

74HC08S

5

46

PR_CSL

O2_CSL

O2_CSL

GA0

GA0

I326I332

I333

PBCSL

PBCSL

ALRMSIL

DOWN_BTNUP_BTN

DOWN_LIMITUP_LIMIT

D[15:0]

D14D15

D13D12

D10D9

D11

D8

D15D14D13D12D11D10D9D8

D[15:0]

I206

11-31

Figure 11-13 Parts Locator Diagram for UIF PCB

035355

BOTTOM SIDE TOP SIDE

NELLCOR PURITAN BENNETTNPB-295 MAIN BOTTOM SIDE

NELLCOR PURITAN BENNETTNPB-295 MAIN TOP SIDE

11-33

Figure 11-14 Power Supply Schematic Diagram

035199

Battery Charge

HIGH CURRENT VIAS

ESD Protection

Power Entry

Fan Control

230V

115V

Nellcor # 891196

To Fan

Requires Heat Sink

Battery -

Main Board

Battery +

BATT_OUT

Q6

3

21 2N7002S1

2

3

TH2ASB

F3

I12

NEUTRAL

I10

MPSA56Q5

1

3

22

3

1

F2

2ASB TH

I9

I8

10.0K

R1410.0K

R3CR7

1 3

1N914S

1 3

R1610.0K

CHG_OUT

CR6

13

1N914S

3 1

R7154K

100KR6

Q2

TH2

1

3

4

IRF9510

2

3

1

CHG_IN

R1310.0K

Q3

MPSA56

1

3

2

1

3

2

10.0KR12

U2

4LM385S

8

4

8

10.0KR11

1/2W

R101.50

TH

BATT+

TH

Q42N3904

2

1

32

1

3

MBRS330T3CR4

122

1

T2

OB24-9TH

15

1312

108

63

1

10

12

15

13

8

63

1

FAC-

FAC+

MAIN_DCMAIN_DC

AC-

AC+

0.01UC8

DT1

600V TH

I3

W5

W2

W6

W9

W7

W1

E

BATT_CHK

FAN_CTRL

0.1U

C10

100M

TH

R2

1/4W

I2

TP1

1/2W

R1390K

TH

LINE

NEUT_IN

LINE_IN

EPS2PC3

SW1

TH

6

54

3 2

11

23

4 5

6

SW2MTS50B

TH

NC

T1

E3490ATH

429 7

2 479

E

LM358U1

-

+

+

-

4

81

3

2

0.01UC6

J1

CON_2L

2121

TP2GND

250V4700P

C2

TH

C1220P250VTH

C3

250VTH

220P

THQ12N3904

2

1

33

1

2

I1

GBU8BBR1

TH

4 1

3

2

4 1

3

2

CR522V

SMCJ22C21

21

1N4702CR1

TH15V

21

21C5

15000U35V

TH

+

BATT_CHK

499R4

1.00KR8

10.0KR22

U3

TH

3 GND

1 VIN2VOUT

LM35D

31

2

1.00KR9

C9

TH

100U35V

+

CR222V

SMCJ22C211

2

FAN_CTRL

10.0K

R17

C4100P

C7

0.1U

0.1U

C11

R2010.0K

1/4W

49.9

TH

R24

TH

1.00K

R5

1/2W

LM358U1

-

+

+

-6

57

8

4

R2510.0M

R2173.2K

R191.00K

10.0KR23

49.9KR15

W3

W8

W4

I5

I6

E

I7

VREF

TH2ASB

F1I11

MAIN_DC

I4

11-35

Figure 11-15 Power Supply Parts Locator Diagram

035200

11-37

Figure 11-16 Display PCB Schematic Diagram

035346

100 10 1

100 10 1

SpO2

PULSE RATE

BLIP BARTOP

10V47U

C3 +

10V47U

C4 +

U2

ICM7228A

8 WRITE

28 VSS

VDD19

26SEGG

24SEGFSEGE 2

4SEGDP

25SEGD

1SEGC

3SEGBSEGA 27

9 MODE

7 ID7ID65ID56

10 ID4ID314ID213ID111ID012

DIG8 1821DIG7

DIG6 2217DIG520DIG423DIG316DIG2

DIG1 15

10

7

65

14131112

19

28 1516232017222118

U1

ICM7228A

8 WRITE

28 VSS

VDD19

26SEGG

24SEGFSEGE 2

4SEGDP

25SEGD

1SEGC

3SEGBSEGA 27

9 MODE

7 ID7ID65ID56

10 ID4ID314ID213ID111ID012

DIG8 1821DIG7

DIG6 2217DIG520DIG423DIG316DIG2

DIG1 15

10

7

65

14131112

19

28 1516232017222118

BLIP_TOP

BLIP_TOP

BLIP_BOTTOM

BLIP_BOTTOM

DS7

12

13

14

15

16

17

18

19

11

20

9

8

7

6

5

4

3

2

10

1

HDSP-4850

TH

1

10

2

3

4

5

6

7

8

9

20

11

19

18

17

16

15

14

13

12

02_1_GREEN

02_1_RED

02_100_RED

SEGDP_1SEGG_1SEGF_1SEGE_1SEGD_1SEGC_1SEGB_1SEGA_1

PR_1_GREENPR_10_GREENPR_100_GREENPR_1_REDPR_10_REDPR_100_RED

SEGDP_2SEGG_2SEGF_2SEGE_2SEGD_2SEGC_2SEGB_2SEGA_2

50V0.1U

C1

50V0.1U

C2

DS2

ED

C

BG

F

A

DPGFEDCBA

NARG141

GFE

DP

D

CA_REDCA_GREEN

CBA

141

8 8436710112

4367

1011

2

DS3

ED

C

BG

F

A

DPGFEDCBA

NARG141

GFE

DP

D

CA_REDCA_GREEN

CBA

141

8 8436710112

4367

1011

2

DS4

ED

C

BG

F

A

DPGFEDCBA

NARG141

GFE

DP

D

CA_REDCA_GREEN

CBA

141

8 8436710112

4367

1011

2

DS5

ED

C

BG

F

A

DPGFEDCBA

NARG141

GFE

DP

D

CA_REDCA_GREEN

CBA

141

8 8436710112

4367

1011

2

02_100_GREEN

VDD

VDD

BD0

BD5BD4

BD2BD1

BD3

BD7BD6BD5BD4BD3BD2BD1BD0

BD7BD6

BD7BD5

BD1BD3

BD[7:0]

BD0BD2BD4BD6

J1

CON_7X2

98765432

1413121110

1

98765432

1413121110

1

A0

A0

A0

VDD

DS1

ED

C

BG

F

A

DPGFEDCBA

NARG141

GFE

DP

D

CA_REDCA_GREEN

CBA

141

8 8436710112

4367

1011

2

PR_CSL

PR_CSLO2_CSL

O2_CSL

DS6

ABCDEFG

NARG141

A

FG

B

CD

E

DP

CA_REDCA_GREEN

21110

76348

114

02_10_GREEN

O2_10_RED

SEGE_1

SEGE_1

SEGD_1

SEGD_1

SEGC_1

SEGC_1

SEGB_1

SEGB_1

SEGA_1

SEGA_1

11-39

Figure 11-17 Display PCB Parts Locator Diagram

035347

NELLCOR PURITAN BENNETTNPB-290 DISPLAY TOP SIDE

SP02 PULSE

(Blank Page)

SECTION 12: INDEX

A

Alarm Settings Alarm Silence Duration · 4-1 Alarm Silence State · 4-1 Alarm Volume · 4-1

Analog Output · 10-7 Audible Alarm Settings · 4-1 Authorization Number · 8-1

B

Battery · 2-1 Replacement · 6-5 Storage · 2-1

C

Calculated Saturation · 11-2 Circuit Analysis · 11-2

`CPU · 11-5 AC Input · 11-3 AC Ranging · 11-7 Battery Circuits · 11-4 DC Power Supply · 11-5 Display PCB · 11-8 Functional Overview · 11-2 Input Conditioning · 11-7 LED Control · 11-6 Membrane Keypad · 11-9 PIC Microprocessor · 11-6 Power Supply · 11-3 Real-Time Clock · 11-8 Sensor Output · 11-6 Signal Gain · 11-7 Storage of Patient Data · 11-8 User Interface PCB · 11-5 Variable Gain Circuits · 11-7

Cleaning · 2-1

D

Data Port Analog Output · 10-7 Connecting to · 10-2 Enabling · 10-1 Interactive Mode · 10-7 Interface Protocol · 10-1 Real-Time Printout · 10-3

Date · 10-9 Description

NPB-290 · 2-1 Disassembly

Monitor · 6-3

Prior to · 6-1 Disassembly Guide · 6-1

E

Error Codes · 5-8

F

Fractional Saturation · 11-1 Front Panel · 2-1 Functional Checks · 2-1 Functional Saturation · 11-1 Fuse Replacement · 6-2

I

Information Dump Instrument · 10-8

Interactive Mode · 10-7

M

Manual Overview · 2-1 Measured Saturation · 11-2 Menu Items

Calibration Signal · 4-6 Menu Options · 4-2

Accessing Menu Items · 4-2 Alarm Silence Behavior · 4-5 Baud Rate · 4-3 EPP Mode · 4-3 Language Selection · 4-2 Nurse Call Polarity · 4-4 Return to Default · 4-5 Save as Default · 4-4 Trend Clear · 4-2 Trend Print · 4-2

N

Nurse Call · 10-6

O

Overview Manual · 2-1

Oximetry Overview · 11-1

12-1

Section 12: Index

P

Packing · 8-1 Original Carton · 8-1 Without Original Carton · 8-3

Performance Tests · 3-1 Alarm Limit Ranges · 3-3 Alarm Silence · 3-5 Alarm Volume Control · 3-7 Alarms · 3-5 Analog Output · 3-8 Battery Charge · 3-1 Dynamic Operating Range · 3-7 Factory Power-On Defaults · 3-3 LED Excitation Test · 3-9 Nurse Call · 3-8 Operation on Battery Power · 3-9 Operation with Live Subject · 3-10 POST · 3-2 Power-On Self-Test · 3-2 Pulse Tone Volume Control · 3-7

Performance Verification · 3-1 Equipment Needed · 3-1

Printouts · 10-3

R

Real-Time Printouts · 10-3 Rear Panel · 2-2 Reassembly

Monitor · 6-4 Related Documents · 2-2 Removal

Display PCB · 6-10 Fan · 6-9 Power Entry Module · 6-6 Power Supply · 6-7 Speaker · 6-12 User Interface PCB · 6-11

Replacement Display PCB · 6-10 Fan · 6-9 Power Entry Module · 6-6

Power Supply · 6-8 Speaker · 6-13 User Interface PCB · 6-12

Replacement Level Support · 5-1 Replacement Parts

Obtaining · 5-1 Returned Goods Authorization Number · 8-1 Routine Maintenance · 2-1

S

Safety Checks · 2-1 Safety Tests · 3-10

Earth Leakage Current · 3-11 Enclosure Leakage Current · 3-11 Ground Integrity · 3-10 Patient Applied Risk Current · 3-12 Patient Isolation Risk Current · 3-12

Saturation Calculated · 11-2 Fractional · 11-1 Functional · 11-1 Measured · 11-2

Service Menu · 4-1 Spare Parts · 7-1 Specifications · 9-1

T

Technical Supplement · 11-1 Time · 10-9 Trend

Dump · 10-9 Troubleshooting · 5-1

Alarms · 5-5 Button/Switch Problems · 5-4 Data Port · 5-7 Display · 5-5 Error Codes · 5-8 Guide · 5-2 Performance Problems · 5-6 Power Problems · 5-3 Problem Categories · 5-2 Who Should Perform Repairs · 5-1

12-2