DC30-007 Quantum QT-740 & QT-750 Service Manual Rev Q

Service Manual

Fixed/ElevatingFloat-Top

Radiographic Tables

™

Models QT-740 and QT-750

Manual Part No. DC30-007 Revision Q

EU Authorized Representative:Medizintechnik Berlin GmbHAltentreptower, Strasse 5912683 Berlin - Germany

Phone: +49-302-82 4726Fax: +49-302-82 6382

E-mail: [email protected]

This manual is copyrighted and all rights are reserved. No portion of this document may be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine readable form without prior consent in writing from Quantum Medical Imaging, (QMI)

Copyright© 2007 QMI

Made in U.S.A.Quantum Medical Imaging, 2002-B Orville Drive NorthRonkonkoma, New York 11779 USAPhone: (631) 567-5800Fax: (631) 567-5074E-mail: [email protected]

THE ORIGINAL VERSION OF THIS MANUAL DATED DECEMBER 7, 2000 HAS BEEN DRAFTED IN THE ENGLISH LANGUAGE BY QUANTUM MEDICAL IMAGING

Models QT-740 & QT-750 - Service Manual Revision QQuantum Medical Imaging i

Revision History

REVISION DATE TYPE OF MODIFICATION

A 12/07/00 Initial Release.

B 1/5/01 Added long. magnet adjustment, tabletop width adjustment, DC Motor Driver Bd. replacement procedure

C 2/22/01 Incorporated ECO’s 0241, 0242, 0245, 0247, 0256, 0285

D 4/19/01 Incorporated ECO 0335

E 5/17/01 Modified table mounting instructions

F 8/6/01 Incorporated ECO’s 0294, 0417, 0447, 0451, 0492

G 11/6/01 Incorporated ECO’s 0544, 0572, 0574, 0599

H 3/15/02 Incorporated ECO’s 0706, 0715, 0741, 0749, 0762, 0782

J 7/1/02 Incorporated ECO’s 0449, 0820, 0825, 0845, 0879, 0897

K 8/1/02 Incorporated ECO 0853

L 6/20/03 Incorporated ECO 0894, 1025, 1038, 1116, 1232

M 4/29/03 Incorporated ECO 1189, 1314, 1328, 1359, 1436, 1447

N 9/17/04 Incorporated ECO 1482, 1525

P 4/28/06 Incorporated ECO 1583, 1584, 1605, 1689, 1716

Q 9/7/07 Incorporated ECO 1807, 1850, 1859, 1880

PageNumber Rev

PageNumber Rev

PageNumber Rev

i - iv Q

1-1 thru 1-8 Q

2-1 thru 2-24 Q

3-1 thru 3-6 Q

4-1 thru 4-34 Q

5-1 thru 5-9 Q

Revision Q Models QT-740 & QT-750 - Service Manualii Quantum Medical Imaging

Revision History

THIS PAGE INTENTIONALLY LEFT BLANK

Table of Contents

Models QQuantum

Chapter 1 Specifications

PHYSICAL SPECIFICATIONS ................................................................................. 1-3TABLETOP SPECIFICATIONS ............................................................................. 1-3

TABLE BASE SPECIFICATIONS ........................................................................... 1-3

IMAGE RECEPTOR SPECIFICATIONS .................................................................. 1-3

SYSTEM SPECIFICATIONS ................................................................................. 1-4

ELECTRICAL SPECIFICATIONS .............................................................................. 1-4SYSTEM OPTIONS ................................................................................................ 1-4SYSTEM OPERATING ENVIRONMENT .................................................................... 1-4NON-OPERATING ENVIRONMENT ......................................................................... 1-4

Chapter 2 Assembly & Installation

OVERVIEW .......................................................................................................... 2-3UNPACKING ........................................................................................................ 2-3TABLE ASSEMBLY ................................................................................................ 2-3

POSITIONING THE TABLE BASE ........................................................................ 2-3

ELECTRICAL CONNECTIONS .............................................................................. 2-4

Power Input Connections (Power Cord with Plug Configuration) .................... 2-4

Power Input Connections (Permanent Wiring Configuration) ......................... 2-4

Re-Configuring AC Line Input Transformer (115 VAC/230 VAC Input) ............ 2-6

Bucky Power Input Connections .................................................................. 2-6

PBL Interlock Cable Connections ................................................................. 2-6

TABLE LEVELING AND MOUNTING ........................................................................ 2-8MODEL QT-740 - LEVELING AND MOUNTING INSTRUCTIONS ............................. 2-8

MODEL QT-750 - LEVELING AND MOUNTING INSTRUCTIONS ............................. 2-8

ALIGNMENT PROCEDURES ................................................................................... 2-9IMAGE RECEPTOR/COLLIMATOR X-RAY ALIGNMENT .......................................... 2-9

TABLETOP ASSEMBLY/INSTALLATION ............................................................. 2-11

REDUCING THE TABLE TOP HEIGHT (MODEL QT-750 ONLY) ............................ 2-14

OPERATOR CONTROL HANDLE ASSEMBLY INSTALLATION ................................ 2-16

OPERATIONAL CHECKS AND ADJUSTMENTS ........................................................ 2-17CHECKING TABLE FLOAT-TOP OPERATION ...................................................... 2-17

CHECKING UP/DOWN OPERATION (MODEL QT-750 ONLY) ............................... 2-17

TABLE UP/DOWN SPEED ADJUSTMENT (MODEL QT-750 ONLY) ........................ 2-18

PEDAL DISABLE SWITCH OPERATIONAL CHECK ............................................... 2-18

CHECKING THE OBSTRUCTION SENSORS (ELEVATING TABLE ONLY) ................ 2-19

RECEPTOR CABINET LOCKING MAGNET CHECK ............................................... 2-20

POSITIVE BEAM LIMITATION (PBL) COLLIMATORS .......................................... 2-21

MODEL QT-750 COVERS INSTALLATION/ADJUSTMENT PROCEDURE ..................... 2-21MODEL QT-740 COVERS INSTALLATION PROCEDURE .......................................... 2-23

T-740 & QT-750 - Service Manual Revision QMedical Imaging iii

Table of Contents

Riv

Chapter 3 Theory of OperationOVERVIEW ..........................................................................................................3-3

MODEL QT-740 TABLE ......................................................................................3-3

Power Distribution ......................................................................................3-3

Float Control ..............................................................................................3-4

Foot Pedal Disable Circuit ...........................................................................3-4

Receptor Cabinet Lock ................................................................................3-4

MODEL QT-750 TABLE ......................................................................................3-4

Power Distribution ......................................................................................3-4

Voltage Regulation .....................................................................................3-5

Float Control ..............................................................................................3-5

Foot Pedal Disable Switch ...........................................................................3-5

Positive Beam Limitation .............................................................................3-5

Receptor Cabinet Lock ................................................................................3-5

Emergency Stop Switch ..............................................................................3-5

Chapter 4 Service InstructionsOVERVIEW ..........................................................................................................4-3

SERVICE MAINTENANCE ...................................................................................4-4

Visual Inspection ........................................................................................4-4

Functional Check for Model QT-750 Elevating Tables ....................................4-4

Lubrication ................................................................................................4-5

Float Top Locking Magnet Check .................................................................4-6

TROUBLESHOOTING PROCEDURES ....................................................................4-8

REMOVAL/REPLACEMENT PROCEDURES ...........................................................4-13

Replacing the Drive Belt (Model QT-750 Tables Only) .................................4-13

Replacing the Sync Belt (Model QT-750 Tables Only) ..................................4-14

Replacing the DC Motor (Model QT-750 Tables Only) ..................................4-16

Replacing the DC Motor Driver Board A2 (Model QT-750 Tables Only) ..........4-18

Receptor Cabinet Removal/Replacement ....................................................4-22

Cassette Tray Removal Procedure .............................................................4-23

REPLACEMENT PARTS AND ORDERING INFORMATION .....................................4-24

ORDERING INFORMATION ..............................................................................4-27

Chapter 5 DiagramsModel QT-740 Radiographic Table Wiring Diagram ..............................................5-3

Model QT-750 Radiographic Table Wiring Diagram ..............................................5-4

4-Way Table Control Board A1 (AY40-017T) .......................................................5-5

6-Way Table Control Board A1 (AY40-030T) Test Point Diagram ..........................5-6

Table Base Plate Mounting Hole Locations ..........................................................5-7

Installing Digital Image Receptor Using QT-FCD Mounting Bracket .......................5-8

Installing Digital Image Receptor Using QT-DDS Slide Mounting Bracket ...............5-9

evision Q Models QT-740 & QT-750 - Service ManualQuantum Medical Imaging

Chapter

1-1

SPECIFICATIONS

1

1-2


Models QT-7Quantum M

PHYSICAL SPECIFICATIONS

The following are physical specifications of the radiographic tables:

TABLETOP SPECIFICATIONS

Length: 85.0 inches (2159.0 mm)

Width: 35.5 inches (901.7 mm)

Height (Model QT-740): 32.5 inches (825.5 mm)

Height (Model QT-750):Raised: 32.5 inches (825.5 mm) *(see note 1)Lowered: 21.0 inches (533.4 mm)

Tabletop Travel:Longitudinal: 32 inches (812.8 mm)

Lateral: 10 inches (254 mm)

Tabletop Material: Fiber-resin (phenolic)

Tabletop X-ray Density: 1.0 mm Aluminum

Tabletop-to-Film Plane Distance: approx. 2.75 inches (69.9 mm)

*Note 1: To compensate for low ceilings, maximum raised table height can be decreased by up to 2 inches less (see Assembly & Installation Chapter for instructions)

TABLE BASE SPECIFICATIONS

Width: 48.0 inches (1219.2 mm)

Depth: 26.0 inches (660.4 mm)

Maximum Patient Load (with non-digital image receptor): 650 lbs. (295 kg)

Maximum Patient Load (with non-sliding digital image receptor): 600 lbs. (272.2 kg)

Maximum Patient Load (with sliding digital image receptor): 550 lbs. (249.5 kg)

IMAGE RECEPTOR SPECIFICATIONS

Compatible With: Grid Cabinet, Bucky, ACL Bucky

Receptor Longitudinal Travel: 20.0 inches (508.0 mm) **(see note 2)

**Note 2: 17.00 inches (431.8 mm) of receptor travel with QT-DDS option

40 & QT-750 - Service Manual Revision Qedical Imaging 1-3


R1

SYSTEM SPECIFICATIONSTube Stand Compatibility: Compatible with all Quantum Medical Imaging

tube stands and overhead tube cranes

Overall Weight:Model QT-740: 350.0 lbs. (158.8 kg)Model QT-750: 500.0 lbs. (226.8 kg)

ELECTRICAL SPECIFICATIONSInput Power: 115 VAC (±10%), 15 Amps, 50/60 Hz

230 VAC (±10%), 10 Amps, 50/60 Hz

Mode of Operation:Model QT-740: ContinuousModel QT-750: Intermittent Operation (80 cycles/hour max.)

Momentary Current:Model QT-740: 1.0 AmpModel QT-750: 7.0 Amps

Long Term Current:Model QT-740: 0.20 AmpModel QT-750: 0.25 Amp

Locking System Power: 24 VDC/6.0 Amps

SYSTEM OPTIONS

• R90-CB: Abdominal compression band

• Lateral cassette holder (for cross-table work)

• QT-DDS: Digital Drawer Slide (see Figure 1-3 for specifications)

• QT-BMP4: Rubber Corner Bumpers (set of four)

• QT-PLS: Patient Support Strap

• R-DLMP: Receptor Tray for Canon Imager allows images in length-wise (Portrait) and cross-wise (Landscape) modes.

SYSTEM OPERATING ENVIRONMENTAmbient Temperature: +10°C to +40°C

Relative Humidity: 30 to 75%, non-condensing

Atmospheric Pressure: 700 hPa to 1060 hPa

NON-OPERATING ENVIRONMENTAmbient Temperature: -18°C to +70°C

Relative Humidity: 20 to 95%, non-condensing

Atmospheric Pressure: 500 hPa to 1060 hPa

evision Q Models QT-740 & QT-750 - Service Manual-4 Quantum Medical Imaging



Figure 1-1. Model QT-740 Table Configuration Diagram

85.00

87.00 (MIN.)TO INSTALLTABLETOP(ON EITHERLEFT OR RIGHTSIDE OF TABLE)

35.5

34.00

26.00

10.79PC.G.

32.50

2.75

24.04 PC.G.15.19PC.G.



R1

Figure 1-2. Model QT-750 Table Configuration Diagram

85.00

34.00

32.50

21.00

2.75

NOTE: CENTER-OF-GRAVITY (C.G.) IS CALCULATED WITH TABLE FULLY ELEVATED AND WITHOUT PATIENT.

24.04 PC.G.

35.5

26.00

10.79PC.G.

32.50




Figure 1-3. Table with QT-DDS Option (Slide-Out Canon Digital Receptor)



R1



Chapter

2-1

ASSEMBLY &INSTALLATION

2

2-2


Models QTQuantum

NOTE

Examine all car-tons and crates carefully at time of delivery. If damage is appar-ent, have deliv-ery driver write a "Damaged Ship-ment Note" on copies of freight bill, sign it, and file appropriate carrier claim. Should you dis-cover concealed damage, immedi-ately notify the transporting agent and ask for an "Inspection of Damage". Carrier will not accept concealed dam-age claim if filed after 15 days from date of receipt of mer-chandise.

OVERVIEW

Preparing the table for operation requires completion of the following tasks:

• Positioning the Table Base

• Making the Electrical Connections

• Alignment Procedures

• Tabletop Assembly/Installation

• Checking Table Operation

• Installing the Covers

UNPACKING

Open crate or carton marked "packing list enclosed" first. Remove packing list and use it as a guide to open the remaining cartons. Do not dispose of packing material until packing list is matched with actual parts received. Should there be a shortage or damage, notify manufacturer’s customer service department immediately. The manu-facturer is relieved of any responsibility for damage during shipment after unit is picked up by the carrier.

TABLE ASSEMBLY

The radiographic table is shipped with most of its major components assembled. However, the tabletop assembly must be attached to the base assembly and the cov-ers must be installed. After the table is assembled, an operational check is per-formed. (This check is required only on Model QT-750 radiographic tables.)

On systems equipped with QT-FCD option (fixed mount for Canon Digital Image Receptor), refer to Figure 5-5 in Chapter 5, Diagrams for instructions on installing the digital image receptor in the table.

On systems equipped with QT-DDS option (drawer slide mount for Canon Digital Image Receptor), refer to Figure 5-6 in Chapter 5, Diagrams for instructions on installing the digital image receptor in the table.

POSITIONING THE TABLE BASE

Place the table base in the approximate location where it will be mounted. Ensure that the floor below the table is level. When positioning the table base, ensure there is a minimum clearance of 87 inches from the outer edge of Bearing Rail to the wall on either side of the table (see Figures 1-1 and 1-2). This allows for installation of the tabletop rails following table mounting. If enough clearance is provided, proceed to the "Electrical Connections" paragraph in this chapter.

If there is not enough clearance on either side to install the tabletop after the table is mounted to the floor, the tabletop must be installed prior to mounting the table. To install the tabletop, proceed to the paragraph entitled "Tabletop Assem-bly/Installation" before performing the next procedure.

-740 & QT-750 - Service Manual Revision QMedical Imaging 2-3


R2

ELECTRICAL CONNECTIONS

CAUTION! This equipment contains electrostaticsensitive devices. Observe proper grounding pre-cautions before handling components or printedcircuit boards.

Power Input Connections (Power Cord with Plug Configuration)

For 115 VAC installations, a 25-foot power cord with a hospital-grade plug is factory pre-wired to the table. For 230 VAC installations, a 25-foot "HAR" power cord is factory pre-wired to the table; the installer must attach the proper plug depending on receptacle type used at installation site. If a line cord with plug is provided by the facility, it must have a 16 AWG minimum cord (Type SJT or equivalent) and a hospital grade plug. Connect plug to hospital grade receptacle only. The power supply line input connection is fused internal to the table (2A for 115 VAC line input, 1A for 230 VAC line input for Model QT-740 tables; 6A for 115 VAC line input, 3A for 230 VAC line input for Model QT-750 tables).

Power Input Connections (Permanent Wiring Configuration)

CAUTION! When AC power source is single-phase(e.g., US 115 V and European 230 V), do not fusethe neutral leg if permanently installed. Replaceneutral wire Fuse F1 with dummy fuse, suppliedwith table. When two-phase AC power is used(e.g., US 240 V), both lines must be fused. For fusecharts see Chapter 5 Diagrams, Figure 5-1 forQT-740 Table and Figure 5-2 for QT-750 Table.

The table can be powered from independently fused power source (mains) or from specified equipment, such as an X-ray generator. All electrical connections must be made by a qualified electrician in compli-ance with NEC or local code requirements. Refer to QT-740 or QT-750 Interconnection Diagram in Chapter 5, Diagrams and proceed as follows:

1. To connect external wires to table, either bring cables through the Rear Bottom Cover access opening or, if conduit and flush floor box is run beneath the table, through the large 6" x 5" opening in the table base.



Models QTQuantum

2. Route power input to Terminal Block TB1 (located on table base) ter-minals TB1-1 (line), TB1-2 (neutral) and TB1-3 (GND) as shown in Figure 2-1.

Figure 2-1. Connecting Input Power Cable

3. Connect system ground wires as shown in Figure 2-4.

Figure 2-2. System Ground Wire Connections

TERMINALBOARD TB2

TERMINALBOARD TB1

(REAR VIEW)

POWER INPUT CABLE



R2

Re-Configuring AC Line Input Transformer (115 VAC/230 VAC Input)

Typically, the AC line input transformer is configured at factory in accor-dance with user facility electrical requirements (i.e., 115 VAC or 230 VAC). If it is necessary to re-configure from 115 VAC to 230 VAC, or 230 VAC to 115 VAC, make connections at terminal block TB1, located on table base, as shown in Figure 2-3 and Model QT-740 and QT-750 Radio-graphic Table Wiring Diagrams in Chapter 5, Diagrams.

In addition, on Model QT-740 tables:

• For 115 VAC line input, the rating of fuse F2 and F1 should be 2 Amps, 250V slow-blow (see FFigureigure 5-1, Chapter 5, Diagrams for fuse applications chart.)

• For 230 VAC line input Model QT-750 tables, the rating of fuse F2 and F1 should be 1 Amp, 250V slow-blow

On Model QT-750 tables:

• For 115 VAC line input, the rating of fuse F2 (and F1 if two-phase AC input) should be 6 Amps, 250V slow-blow

• For 230 VAC line input Model QT-750 tables, the rating of fuse F2 and F1 should be 3 Amps, 250V slow-blow(see Figure 5-2, Chapter 5, Diagrams for fuse applications chart.)

CAUTION! A "dummy fuse" should be installed inF1 fuseholder on all one-phase (with neutral) AC(Permanently Installed hard wire mains) inputconfigurations as shown in Models QT-740 andQT-750 Radiographic Table Wiring Diagrams (seeChapter 5, DIAGRAMS).

Bucky Power Input Connections

To connect bucky wiring to table, route bucky cable through rear bottom cover access opening to Terminal Block TB2 (see Figure 2-1). Refer to Q-740 and QT-750 Table Wiring Diagrams in Chapter 5, Diagrams and to bucky manufacturer’s installation manual (provided with system) for spe-cific bucky wiring information.

PBL Interlock Cable Connections

On Model QT-750 tables using PBL interlock, connect PBL cable in accor-dance with QT-740 and QT-750 Table Wiring Diagrams (refer to Chapter 5, Diagrams).



Models QTQuantum M

T1

4-62-4305

4

1

23

8

76

5

F1

OR DUMMY FUSE(SEE NOTE)

F2TB1

77

66 55 44 33

22 11

77

66554433

2211

88

88

99

10109

9

1010

NEUTRAL

GNDLINE

GND

L1

IN

LINE FILTER

115VAC

FL120VAC

10A, 250VAC

L2

110VAC

BLACK

WHITE

BLACKWHITE

GREEN/YELLOW

WHITE

RED

ORANGEYELLOW

ORANGE

ORANGERED

RED

INSTALL JUMPERS BETWEENTERMINALS 5 & 6 AND 9 & 10

115 VAC INPUT:

TB1

1 2 3 4 5 6 7 8 9 10

T1

4-62-4305

4

1

23

8

76

5

F1

A "dummy fuse" should be installed in F1 fuseholder on all one-phase(with neutral) AC (Permanently Installed hard wire mains) inputconfigurations as shown in Models QT-740 and QT-750 RadiographicTable Wiring Diagrams (see Chapter 5, DIAGRAMS).

F2TB1

77

66

55 44 33 22 11

77

66

55443322

11

88

88

99

10109

9

1010

GND

L1

IN

LINE FILTER

230VAC

FL120VAC

10A, 250VAC

L2

110VAC

BLACK

WHITE

BLACKWHITE

GREEN/YELLOW

WHITE

RED

ORANGEYELLOW

ORANGE

ORANGERED

RE

D

INSTALL JUMPER BETWEENTERMINALS 6 AND 10

230 VAC INPUT:

TB1

1 2 3 4 5 6 7 8 9 10

NEUTRAL

GNDLINE

OR DUMMY FUSE(SEE NOTE)

A "dummy fuse" should be installed in F1 fuseholder on all one-phase(with neutral) AC (Permanently Installed hard wire mains) inputconfigurations as shown in Models QT-740 and QT-750 RadiographicTable Wiring Diagrams (see Chapter 5, DIAGRAMS).

Figure 2-3. Connecting Input Power Cable

-740 & QT-750 - Service Manual Revision Qedical Imaging 2-7


R2

TABLE LEVELING AND MOUNTING

The following paragraphs describe the steps necessary to level and mount ModelsQT-740 and QT-750 tables.

MODEL QT-740 - LEVELING AND MOUNTING INSTRUCTIONS

1. Move the QT-740 table into position according to room plan.

2. Place protective covering over boards and components located on the table base plate to prevent damage from dust and debris during drilling.

3. Using the six (6) table Base Plate 3/8" diameter mounting holes as a guide, transfer drill through the table base plate mounting holes.

4. Place a level on the table or bucky. A double-bubble level at least 18" long is recommended. If the table is not perfectly level, place the flat shim plates near the mounting locations (below the 1/2" aluminum base plate) as required until the table or bucky reads level. The shims, which measure approximately 3" x 5", are included with the table hardware kit.

5. Mount table to floor using hardware suitable for the type of floor in the instal-lation and of sufficient strength to handle 500 lb. pull-load.

MODEL QT-750 - LEVELING AND MOUNTING INSTRUCTIONS

1. Figure 5-5 in Chapter 5, DIAGRAMS shows the locations of the table mount-ing holes and cable through openings. Using Figure 5-5 as a guide, mark locations of the six (6) 3/8" diameter Base Plate mounting holes on the floor.

2. Drill the six (6) mounting holes as marked on floor.

3. Place Base Plate Sound-Proof Material (P/N ME30-081) into position over drilled holes.

4. Move table into position on top of Base Plate Sound-Proof Material.

5. Place a level on the table or bucky. A double-bubble level at least 18" long is recommended.

6. If the table is not perfectly level, place the flat shim plates near the mounting locations as required until the table or bucky reads level.

7. Mount table to floor using hardware suitable for the type of floor in the instal-lation and of sufficient strength to handle 500 lb. pull-load.



Models QTQuantum

ALIGNMENT PROCEDURES

IMAGE RECEPTOR/COLLIMATOR X-RAY ALIGNMENT

The image receptor must be properly aligned with the projected light field of the collimator in order to provide accurate x-ray exposures. If the tube stand used with the table provides transverse travel of the x-ray tube relative to the table, set the tube transverse travel in the center detent position prior to performing align-ment.

The following x-ray alignment procedure may require slight repositioning of the table base. This movement may affect the position or arrangement of the leveling plates, requiring an additional check that the table remains level.

Collimator calibration, tube stand alignments, and collimator light field to x-ray field adjustments, as described in their respective manuals, must be performed prior to the following procedure.

1. If the tabletop is installed, remove the radiographic portion of the tabletop, otherwise, proceed to step 2. The tabletop is held on with dual-lock tape; lift up a corner then carefully pull the tabletop off.

2. With the collimator parallel to the tabletop (0°), turn on the collimator light. Using the light field adjusting knobs on the collimator, reduce the light field to a narrow beam of light along the length of the table.

3. Position the collimator to approximately 24" source-to-image distance (SID).

4. Insert a 14" x 17" cassette into the film tray.

5. Turn on power to the table.

6. Turn on the collimator light and, if necessary, loosen mounting hardware and move the entire table so that the longitudinal center line on the cassette (i.e., the line which is parallel to the length of the table) is properly aligned with the narrow beam of light (see Figure 2-4).



R2

7. Move the tube stand and Receptor Cabinet simultaneously to check for con-tinuous alignment of the narrow beam of light to the cassette center line (seeFigure 2-4).

Figure 2-4. Table Longitudinal Axis Alignment

8. Remove cable tie securing the Receptor Cabinet to tabletop frame.

9. If the light beam and cassette center line are in proper alignment, Position the collimator at 40" SID.

10. Pull the cassette film tray handle out so it extends out of the front opening in table.

11. Turn on the collimator light.

12. Check for proper alignment of the image receptor centering light (emitted by the collimator) with the notch in the cassette film tray handle. If misaligned, refer to the collimator manual for alignment procedures. Tighten table mounting hardware if previously loosened.



Models QTQuantum M

TABLETOP ASSEMBLY/INSTALLATION

CAUTION! Be careful not to damage the Obstruc-tion Sensors when installing the Tabletop Assem-bly.

The following procedure describes how to install the Tabletop Assembly in the Tabletop Frame.

1. Unpack the Tabletop Assembly from the carton.

2. At the left end of the Tabletop Assembly (as viewed from front of table), remove three (3) 1/4-20 x 1" low profile socket head screws securing End Trim Plate to Tabletop End Support. Note: The front edge of table top is indi-cated by a label.

IMPORTANT! All shims located between theTabletop End Support and Rear Table Rail must bere-installed in exactly the same quantity and loca-tion for tabletop to be square. If not, tabletopmotion may be adversely affected.



Re2-

3. Remove four (4) 1/4-20 x 3/4" socket head cap screws securing Tabletop End Support to rails and remove Tabletop End Support (see Figure 2-5). Retain all shims for re-assembly.

Figure 2-5. Table Top End Trim Plate and End Stop Bumpers

4. Apply power to the table. While pressing the FLOAT foot pedal (or FLOAT push button switch), push in the two float top longitudinal electromagnets so locks are in "released" position. This will provide sufficient clearance to slide the table top past the magnets. Do not loosen the longitudinal magnet mounting brackets; re-adjustment of the longitudinal brakes adjustment will be required (refer to Chapter 4, Service Maintenance for instructions).

5. Slide the Tabletop Assembly onto the bearing assemblies from the right-hand end of the table (as viewed from front of table).

END STOP BUMPERS

END TRIMPLATE

TABLETOP END SUPPORT

TABLE TOPASSEMBLY

(BOTTOM VIEW)

vision Q Models QT-740 & QT-750 - Service Manual12 Quantum Medical Imaging


Models QTQuantum M

6. Install Tabletop End Support (with correct number of shims) to rails using four (4) 1/4-20 x 3/4" socket head cap screws (see Figure 2-6).

Figure 2-6. Tabletop End Support Shim Location

SHIMS (P/NME11-115 (.030")

AND/OR ME11-194 (.010")

TABLETOP END SUPPORT

REARTABLE RAIL



Re2-

NOTE: The Tabletop End Supports and Rails were assembled and properly "squared" prior to shipment from the factory. If tabletop "binding" occurs as the table top is floated longitudinally, re-check that the tabletop is square. If not, add or remove shims as required (additional shims, two .030 (ME11-115) and two .010 (ME11-194), are provided in the hardware bag included with the table).

7. Re-attach the End Trim Plate to the Tabletop Assembly.

8. Re-install the two (2) Table Top End Stop Bumpers on Tabletop Frame.

9. Remove protective backing strip from double-sided tape.

10. Install the radiographic portion of tabletop (i.e., phenolic) by carefully placing it on the Tabletop Assembly.

11. Press down firmly along all four edges of the phenolic tabletop to secure.

CAUTION! Be sure dual-lock tape securing table-top to Tabletop Assembly is completely inter-locked along all four sides of table. If not, thephenolic tabletop may deflect and interfere withtable "float" motion.

REDUCING THE TABLE TOP HEIGHT (MODEL QT-750 ONLY)

In some facilities, it may be desirable to reduce the maximum vertical height of the table top (e.g., facilities having an eight-foot ceiling and overhead tube crane). The following procedure describes how to re-configure the table up limit switch to decrease the vertical height of the table top (up to two inches lower - 30.5").

1. Locate the table Up Limit Switch S9 (behind the front side Center Ball Screw Mounting Block) and remove two screws securing the switch to the switch mounting plate.

2. Turn the switch over, rotate it 180° and then re-mount the switch to the switch mounting plate (see Figure 2-7).

3. Further adjustment of the vertical table top can be achieved by loosening the two screws securing the switch mounting plate to the table base and sliding the mounting plate forward or backward until desired table top height is attained. Secure switch plate mounting screws when table top is at correct height.



Models QTQuantum M

Figure 2-7. Changing Up Limit Switch Orientation to Reduce Table Top Height



Re2-

OPERATOR CONTROL HANDLE ASSEMBLY INSTALLATION

The following procedure describes how to install the Operator Control Handle Assembly on the table.

1. Loosen the black plastic knob on the Operator Control Handle Assembly.

2. Insert the rectangular mounting bracket on the rear side of the Operator Con-trol Handle Assembly into the tabletop’s front (or rear, if desired) accessory mounting channel as shown in Figure 2-8.

3. Locate the Operator Control Handle Assembly in desired position and tighten the black plastic knob

4. Connect the Operator Control Handle Assembly plug into the circular socket (located on the right side transverse cover) and tighten.

Figure 2-8. Installing the Operator Control Handle Assembly

PLUG

OPERATORCONTROL

HANDLEASSEMBLY

ACCESSORY CHANNEL



Models QTQuantum

NOTEThe DC Motor Driver Board A2 has five (5) trim pots identified on the printed circuit board that are factory calibrated and should not require any further adjustment.

OPERATIONAL CHECKS AND ADJUSTMENTS

When the table is completely assembled and all required electrical connections have been made, perform the following tests to verify proper system operation. Tests for the table’s elevating (up/down) functions and positive beam limitation (PBL) are required only on Model QT-750 tables.

CHECKING TABLE FLOAT-TOP OPERATION

1. Depress the FLOAT foot pedal. The tabletop should move freely in either direction. Release the FLOAT foot pedal. The tabletop should be locked securely in its present position.

2. Depress the FLOAT push button on the Operator Control Handle Assembly. The tabletop should move freely in either direction. Release the FLOAT push button. The tabletop should be locked securely in its present position.

CHECKING UP/DOWN OPERATION (MODEL QT-750 ONLY)

1. Depress the UP and then the DOWN foot pedal. The following should occur while each foot pedal is depressed:

a. The tabletop should start to move up (while the UP foot pedal is pressed) and down (while the DOWN foot pedal is pressed).

b. The FLOAT foot pedal (the outside pedals) should be disabled (i.e., the tabletop should remain locked) while the tabletop is moving up or down.

c. With the table running either up or down, press the red Emergency Stop Switch. Table up or down motion should stop. Turn the Emer-gency Stop Switch counterclockwise until it is released. Tabletop up/down motion is now enabled when foot pedals are pressed.

2. Repeat previous step using the Operator Control Handle Assembly Up/Down rocker switch.

3. While running the table down, manually activate each Down Limit Safety Switch (S7 and S10, see Figure 2-9). The table should stop driving down.

4. While running the table up, manually activate each Up Limit Safety Switch (S8 and S9, see Figure 2-9). The table should stop driving up.

CAUTION! Table up/down height must be set tothe heights specified in the following steps. Failureto do so can cause damage to table components.

5. With table top in fully up position, measure table top height (i.e., distance from floor to top of table). Table up height should be 32" (812.8 mm). If not, loosen two (2) screws on Up Limit Safety Switch Mounting Bracket and adjust position of the Up Limit Safety Switches. Verify correct table top height after adjustment.



Re2-

6. With table top in fully down position, measure table top height (i.e., distance from floor to top of table). Table down height should be 21.5" (546.1 mm). If not, loosen two (2) screws on Down Limit Safety Switch Mounting Bracket and adjust position of the Down Limit Safety Switches. Verify correct table top height after adjustment.

TABLE UP/DOWN SPEED ADJUSTMENT (MODEL QT-750 ONLY)

If an adjustment to the Up/Down motor speed is necessary, it can be accom-plished by adjusting the MOTOR SPEED potentiometer A1R27 and A1R78 (on 6-Way Table Control Board A1, part number AY40-030T). However, it is recom-mended that travel time (fully raised to fully lowered) remain in the range of between 8-14 seconds.

1. Locate the MOTOR SPEED potentiometer on 6-Way Table Control Board A1 (see Figure 5-4 in Chapter 5, Diagrams).

2. Rotating the potentiometers A1R27 (Down Motion) and A1R78 (Up Motion) clockwise (CW) increases speed, counterclockwise (CCW) rotation decreases speed.

Figure 2-9. Up/Down Limit Switch Locations

PEDAL DISABLE SWITCH OPERATIONAL CHECK

1. Depress the Pedal Disable Switch until the PEDAL DISABLE SWITCH lamp illu-minates.

2. Check that all foot pedal functions are disabled, and the FLOAT push button is disabled.

UP LIMITSAFETY SWITCH

DOWN LIMITSAFETY SWITCH

REDUNDANTUP LIMIT SAFETY SWITCH

REDUNDANTDOWN LIMIT SAFETY SWITCH

FRONT REARTB3

SAFETY BRACKET(STORED LOCATION)



Models QTQuantum M

3. Depress the Pedal Disable Switch until switch lamp extinguishes.

4. Check that all pedal functions and the FLOAT push button are operational.

CHECKING THE OBSTRUCTION SENSORS (ELEVATING TABLE ONLY)

On Model QT-750, adjustment of the four (4) Obstruction Sensors (S3-S6) was performed at the factory prior to shipment and no additional adjustment is nor-mally required. However, in the event Obstruction Sensor adjustment becomes necessary, the following procedure is provided. The Obstruction Sensors are located at each end of the left and right Transverse Assemblies below each table-top rail (see Figure 2-10). Proceed as follows:

1. While the table is driving down, have an assistant lift up the table top (grasp-ing under the rail) at one corner of the table.

2. The table should stop driving down when the table top is lifted with a reason-able amount of force.

3. To adjust obstruction sensors, remove the Table Top Assembly (refer to Table-top Assembly/Installation procedure in this chapter).

4. Loosen the lower hex nut (underside of Bearing Rail) securing the switch to the Bearing Rail. Turn the upper hex nut on obstruction switch clockwise to increase sensitivity, counterclockwise to decrease sensitivity.

5. Re-tighten the lower hex nut when adjustment is correct.

6. Re-install Tabletop Assembly (refer to Tabletop Assembly/Installation proce-dure in this chapter).

7. Repeat above steps for each of the other obstruction sensors.

Figure 2-10. Obstruction Sensor (Typical)

OBSTRUCTION SENSOR

BEARING RAIL ASSEMBLY



Re2-

RECEPTOR CABINET LOCKING MAGNET CHECK

Verify the receptor cabinet locking magnet firmly locks the receptor cabinet along full range of travel. When magnet is released, check for sufficient clearance between the magnet and wear strip. The magnet should not contact the wear strip when released. If adjustment is required, see Figure 2-11 and proceed as follows:

Figure 2-11. Receptor Cabinet Locking Magnet

1. Loosen the three (3) 10-32 x 1/4" pan head screws securing the Receptor Cabinet Magnet Lock Bracket to Receptor Mounting Plate.

2. Push the magnet up to fully raised (released) position.

3. Place two (2) Brake Spacer Tools, P/N TL10-002 (a piece of 0.020" shim stock) provided with the table, between magnet and wear strip.

4. Tighten the three (3) 10-32 x 1/4" pan head screws securely.

5. Re-check operation of receptor cabinet locking magnet.

ADJUST FOR APPROXIMATELY 0.04" GAP

10-32 X 1/4" PANHEAD SCREWS

(3X)



Models QTQuantum M

POSITIVE BEAM LIMITATION (PBL) COLLIMATORS

For Positive Beam Limitation (PBL) Collimators and Elevating Tables only, verify the Vertical SID Interlock feature is functioning properly as follows:

1. Place a 14" x 17" film cassette into the cassette tray and insert the cassette tray into the Receptor Cabinet.

2. Turn on power to the table.

3. Raise the table until it stops.

4. Position the collimator to 40" SID to table image receptor (40" SID LED indi-cator on tube stand handgrips should be illuminated).

5. The collimator should indicate it is ready for exposure.

6. Depress the DOWN foot pedal. The collimator should now indicate it is not ready for exposure.

7. Try to take an x-ray exposure and verify that no exposure is possible.

MODEL QT-750 COVERS INSTALLATION/ADJUSTMENT PROCEDURE

Proceed as follows after completing all wiring, alignment, and assembly operations:

1. Raise table to full up position.

2. Attach the Lower Rear Cover to aluminum base plate using five (5) 10-32 x 3/8" screws with external tooth star washers (see Figure 2-12). Do not fully tighten screws at this time.

Figure 2-12. Table Lower Front and Rear Covers Installed

LOWER REAR COVER

LOWER FRONTCOVER



Re2-

3. Attach the Lower Front Cover to aluminum base plate using four (4) 10-32 x 3/8" screws with external tooth star washers (see Figure 2-12). Do not fully tighten screws at this time.

4. Attach two (2) Lower Side Covers to Lower Front and Lower Rear Covers using four (4) 6-32 x 3/8" screws with external tooth star washers in each Lower Side Cover (see Figure 2-13).

Figure 2-13. Table Lower Left and Right Covers Installed

5. Lower the table top to check that Scissors Assembly does not interfere with Lower Front and Rear Covers. Adjust covers as necessary. When covers are correctly positioned, tighten all hardware securing lower covers.

6. Attach Upper Front Cover to the tabletop frame using four (4) 10-32 x 3/8" screws with external tooth star washers. Do not fully tighten screws at this time.

7. Attach Upper Rear Cover to tabletop frame using two (2) 10-32 x 3/8" screws and external tooth star washers. Do not fully tighten screws at this time.

8. Attach Upper Front Cover to Upper Rear Cover using two (2) 8-32 x 3/8" screws and external tooth star washers (see Figure 2-14). Tighten all hardware securing upper covers.

9. Verify there is adequate clearance for the top covers; test run the table up and down while checking for interference between upper and lower covers. If adjust-ment is necessary, remove upper covers, then loosen screws securing lower front and rear covers. Adjust lower covers in or out on slots, as required. Tighten all lower cover hardware, re-assemble upper covers and re-check for interference.

LOWER LEFT COVER

LOWER RIGHTCOVER



Models QTQuantum

Figure 2-14. Upper Rear Cover Installed

MODEL QT-740 COVERS INSTALLATION PROCEDURE

Proceed as follows after completing all wiring, alignment, and assembly operations:

1. Attach the Lower Rear Cover to aluminum base plate using five (5) 10-32 x 3/8" screws with external tooth star washers (see Figure 2-12). Do not fully tighten screws at this time.

2. Attach the Lower Front Cover to aluminum base plate using four (4) 10-32 x 3/8" screws with external tooth star washers (see Figure 2-12). Do not fully tighten screws at this time.

3. Attach two (2) Lower Side Covers to Lower Front and Lower Rear Covers using four (4) 6-32 x 3/8" screws with external tooth star washers in each Lower Side Cover (see Figure 2-13).

4. Adjust covers as necessary. When covers are correctly positioned, tighten all hardware securing lower covers.

5. Attach Upper Front Cover to the tabletop frame using four (4) 10-32 x 3/8" screws with external tooth star washers. Do not fully tighten screws at this time.

6. Attach Upper Rear Cover to tabletop frame using two (2) 10-32 x 3/8" screws. Do not fully tighten screws at this time.

7. Attach Upper Front Cover to upper Rear Cover using two (2) 8-32 x 3/8" screws and external tooth star washers (see Figure 2-14). Tighten all upper cover hardware.

UPPER REAR COVER



Re2-



Chapter

3-1

THEORYOF OPERATION

3

3-2

Chapter 3 Theory of Operation


NOTEThe table power supply cord is the power disconnect device. If hard wiring system power connection, the disconnect device is facility-provided external circuit breaker or shut-off switch.

OVERVIEW

Model QT-740 and QT-750 radiographic tables feature a tabletop that "floats" in four directions for transverse and longitudinal patient positioning. The tabletop of ModelQT-750 can also be raised and lowered.

The tabletop floats (rides) on 30 bearings; 26 provide longitudinal tabletop motion, and four are provided for transverse (forward and backward) tabletop motion. The longitudi-nal bearings are bolted to two precision-machined stainless steel bearing bars, which are mounted below the tabletop on the front and back sides of the table. Four 1-5/8" load bearings bolted on the Transverse Carriage Assembly permit transverse travel of the tabletop. Eight anti-racking and four anti-tipping guide bearings, bolted to the Transverse Carriage Assembly, stabilize tabletop transverse motion by controlling movement of the left and right Transverse Rails.

Two fail-safe brakes (24 VDC electromagnets) are positioned extremely close to the bear-ing bars. When the electromagnets are de-activated (i.e., FLOAT foot pedal/push button is not pressed), the fail-safe brakes "grab" the bearing bar securely, locking the longitudi-nal travel of the table. Similarly, four fail-safe brakes (24 VDC electromagnets) are used to grab the Transverse Rails, locking the transverse travel of the table. Depressing either the FLOAT foot pedal(s) or FLOAT push button energizes the electromagnets, releasing the fail-safe brakes and allowing the tabletop to float freely both longitudinally and trans-versely.

The Receptor Cabinet rides on four linear ball-bearings mounted to adjustable brackets attached to either side of the cabinet. These bearings travel on the hardened and pol-ished steel shafts of the Receptor Cabinet Carriage. One electromagnet on the underside of the housing "locks" the Receptor Cabinet into place until the Receptor Cabinet Lock Release switch is depressed, thereby releasing the magnet's hold and allowing free move-ment of the Receptor Cabinet.

The following paragraphs provide theory of operation for Model QT-740 and ModelQT-750 radiographic tables.

MODEL QT-740 TABLE

The table's major electrical components include the AC transformer and fuse block, printed circuit boards, and magnetic locks. See Figures 5-1 and 5-3 in Chapter 5, Dia-grams.

Power Distribution

115/230 VAC line input is applied through fuses F1 and F2 to step-down trans-former T1. Transformer T1 provides 18 VAC to 4-Way Table Control Board con-nector A1J1-1 and A1J1-2. The 18 VAC input is applied to full-wave bridge rectifier A1DB1, filtered by A1C1 and A1R1, and applied through resistor A1R2 and zener diode A1D1 to produce +12 VDC. The +24 VDC output of A1DB1 is connected to A1J1-6 and A1J1-10 to provide +24 VDC to the bucky, transverse, and longitudinal electromagnets.

40 & QT-750 - Service Manual Revision Qedical Imaging, LLC 3-3


R3

Float Control

Model QT-740 tables have one foot pedal and one push button switch (located on the Operator Control Handle Assembly) that control four-way float top operation. Pressing the foot pedal operates switches S1 and S2, and pressing the push but-ton switch operates switch S3. When S1, S2, or S3 is activated, a negative-going level is applied through normally open (N.O.) PEDAL DISABLE switch S4 and FLOAT switch S1, S2, or S3 to A1C3, which generates a negative-going pulse at one-shot A1U1-2 on 4-Way Table Control Board A1. One-shot A1U1-3 produces a 47-second pulse that turns on FET A1Q1, which provides drive current for the +24 VDC transverse and longitudinal electromagnets. The magnets release the mechanical brakes, allowing tabletop "float" motion. After 47 seconds, or releas-ing the FLOAT foot pedal or push button (which applies a negative-going level to A1U1-4, resetting A1U1) A1Q1 turns off. The magnets de-energize and lock pre-venting tabletop "float" motion.

Foot Pedal Disable Circuit

A Foot Pedal Disable Switch S4 is located below the table rail on the left end of the table. Pressing the switch until PEDAL DISABLE SWITCH lamp DS2 is illumi-nated disconnects FLOAT switches S1, S2, and S3 thereby disabling FLOAT foot pedal and FLOAT push button operation. When the patient is in the correct loca-tion for x-ray, disabling the FLOAT foot pedal push button prevents inadvertent activation of the pedal. When Foot Pedal Disable Switch lamp DS2 is not illumi-nated, the FLOAT foot pedal and push button are fully operational.

Receptor Cabinet Lock

The Receptor Cabinet magnetic lock has its own release switch (S5) for Receptor Cabinet positioning. When S5 is pressed, the Receptor Cabinet locking magnet is de-energized enabling cabinet movement.

MODEL QT-750 TABLE

The table's major electrical components include the AC transformer and fuse block, printed circuit boards, magnetic locks, and DC motor. Vertical table motion is per-formed by a motor-driven twin lead screw assembly mounted on the table base. The DC motor drives the twin lead screw assembly via belt connection, which extends (upward) and retracts (downward) the Scissors Assembly when the UP or DOWN foot pedal, respectively, is depressed. See Figures 5-2 and 5-4 in Chapter 5, Diagrams.

Power Distribution

115/230 VAC line input is applied through terminal board TB1, fuses F1 and F2, and line filter FL1 and to AC transformer T1. Transformer T1 provides 20 VAC to 6-Way Table Control Board A1. Transformer T1 also provides 110 VAC to DC Motor Driver A2 (AC terminals) and to 6-Way Table Control Board connector A1J1-15 and A1J1-16.

evision Q Models QT-740 & QT-750 - Service Manual-4 Quantum Medical Imaging, LLC



Voltage Regulation

From AC transformer T1, 20 VAC is supplied to 6-Way Table Control Board A1 at connector pins A1J5-1 and A1J5-3 (see Figure 5-2). Fuse protection for 20 VAC input is provided by fuse A1F2.

Float Control

Model QT-750 tables have two FLOAT foot pedals, which operate switches S11 and S12 and a FLOAT push button switch (S13) located on the Operator Control Handle Assembly, attached to the tabletop accessory rail. When S11, S12, or S13 is activated, a low FLOAT signal is applied through 6-Way Table Control Board connector A1J2-18. This signal triggers a one-shot that produces a 47 second pulse, which provides drive current for the +24 VDC transverse and longitudinal electromagnets. The magnets release the mechanical brakes allowing tabletop "float" motion. When the FLOAT push button is released, or after 47 seconds of continuous activation (i.e., after the one-shot times out) the magnets are de-energized and the fail-safe brakes lock, inhibiting tabletop "float" motion.

Foot Pedal Disable Switch

Foot Pedal Disable Switch S14 is located below the table rail on the left end of the table. Pressing the switch until the PEDAL DISABLE SWITCH lamp DS2 is illumi-nated disables foot pedal operation. When the patient is in the correct location for x-ray, disabling the foot pedals prevents inadvertent activation of the pedals. When the Foot Pedal Disable Switch lamp DS2 is not illuminated, the foot pedals are fully operational.

Positive Beam Limitation

When the table is used in a PBL system, the UP LIMIT signal is used to prevent exposures when the table is not in its full up position (i.e., at 40" SID). Relay A1K8 is energized when the table is at its maximum up position (as indicated when the /UP LIMIT signal is active low) to indicate the 40" SID position via relay contact closure at A1J4-1 and A1J4-2. This contact closure is then fed to the table's PBL circuit to indicate the 40" SID position.

Receptor Cabinet Lock

The Receptor Cabinet magnetic lock has its own release switch (S15) for Receptor Cabinet positioning. When S15 is pressed, the Receptor Cabinet locking magnet is de-energized enabling cabinet movement.

Emergency Stop Switch

The Emergency Stop switch (S16) is a two-position push-button switch connected across the 110 VAC secondary of transformer T1. Pressing the switch breaks the 110 VAC input connection applied to DC Motor Driver Board A2 (at one AC termi-nal) thereby removing power from the table DC motor drive circuit. To restore power, the switch must be manually released to the normally closed position.

40 & QT-750 - Service Manual Revision Qedical Imaging, LLC 3-5


R3

In addition to providing an emergency shut-off function, the Emergency Stop Switch serves as an indicator lamp that flashes at a 1-Hertz rate in the event one of the following "faults" occur:

• Any of the obstruction sensors (S3 - S6) are activated (during tabletop down movement)

• A drive belt fault condition occurs (i.e. snapped or disengaged belt), sensed by normally-closed MOTOR BELT switch S22

• A sync belt fault condition occurs (i.e. snapped or disengaged belt), sensed by normally-closed SYNC BELT switch S23

• DC Motor over-temperature fault occurs (motor temperature exceeds 70°C), sensed by DC Motor thermal switch S21

• The 20 VAC input from transformer T1 falls below 15% nominal

• Redundant down limit switch S10 or redundant up limit switch S8 is activated

When any of the above conditions occur, a low-to-high transition is applied to a1-Hz square wave oscillator/transistor circuit on Table Control Board A1, which generates the FL+EM SW signal that drives the EMERGENCY SWITCH LAMP DS1 through connector A1J2-20.

evision Q Models QT-740 & QT-750 - Service Manual-6 Quantum Medical Imaging, LLC

Chapter

4-1

SERVICEINSTRUCTIONS

4

4-2

Chapter 4 Service Instructions


OVERVIEW

This chapter provides instructions to assist the service technician in maintaining the smooth operation of the table. The table will function reliably when maintained according to the instructions provided in this chapter. Only properly trained service personnel should service or maintain this equipment. Safe equipment performance requires the attention of service personnel who are specifically trained and experi-enced with medical x-ray apparatus. Applicable preventive maintenance or any repair service should be performed by these skilled individuals. Failure to follow manufac-turer’s or service personnel’s recommendations may result in serious injury.

WARNING! Personnel engaged in maintenanceactivities should exercise normal caution and carewhile working with electromechanical equipment.Before removing or opening any electrical powerpanels or covers, verify that the incoming powersupply is turned OFF. In the event maintenanceprocedures require power to be supplied to theunit, extreme care MUST be exercised to insurethe safety of service or other personnel in thearea. When working on the Scissors Assembly, besure the Safety Bracket is installed as shown inFigure 4-1. Verify that the equipment is properlygrounded before attempting any electrical opera-tion.

Figure 4-1. Safety Bracket Installed

SAFETY BRACKET



R4

SERVICE MAINTENANCE

WARNING! Always disconnect the equipmentfrom the main power supply prior to any cleaning.

Visual Inspection

A complete series of inspections and functional checks was conducted at installation to insure proper operation of the system. The following inspection and adjustment procedures are recommended to maintain the system in its original operating condition.

Perform Every Six Months:

•Check for evidence of loose hardware or loose wires

•Check all bearings and bearing surfaces for cleanliness and corrosion

•Clean Bearing Tracks

•Conduct a general inspection for worn or damaged parts

•Inspect Drive and Sync belts for wear, cracks, looseness

•Check for smoothness of Receptor Cabinet motion

•Verify that all ground conductors are properly and securely installed and free of corrosion or damage

•Check all electrical cabling and wiring for wear and fraying

•Perform a functional test and check table vertical travel (Model QT-750 only)

•Perform float top locking magnet operational check (refer to "Float Top Locking Magnet Check" procedure in this chapter)

•Check external covers for proper fit; inspect for scratches that may indicate cover misalignment or damage caused by collisions with footstools, trolleys, or other equipment

Functional Check for Model QT-750 Elevating Tables

1. Raise the table to the full up position and then turn power off.

2. Remove the upper and lower covers from the table.

WARNING! On Model QT-750 tables, a SafetyBracket (mounted on the QT-750 table base plate)is used to prevent collapse of the Scissors Assem-bly onto the table base plate during servicing.Verify Safety Bracket is in place as shown in Fig-ure 4-1 prior to servicing around or below theScissors Assembly.

3. Check mounting hardware that mounts table base to the floor for a secure, tight fit. Be sure to check all six (6) mounting points.

4. Lubricate two (2) Lead Screw shafts using NGLI no. 1 grease (Superlube® Multipurpose Grease, Lubriplate MAG-1 Polymer Grease, or equivalent).




5. Lubricate points as shown in Figures 4-2 and 4-3. Use light weight machine quality oil only!

Figure 4-2. Lubrication Points - Table Frame Thompson Shafts

6. Turn power on to the table.

Figure 4-3. Lubrication Points - Bucky Thompson Shafts



R4

WARNING! Exercise extreme care to insure thesafety of service or other personnel in the area.DO NOT insert hands, tools, etc., into the ScissorsAssembly area while power is on.

7. Check table travel by driving the table down and then up. Make sure that nothing is binding or pulling during the up/down travel movement.

8. On PBL systems, verify table/collimator S.I.D. Interlock feature operates correctly.

9. Replace the upper and lower table covers (refer to Chapter 2, Assembly and Installation).

10. Place a loaded cassette into the bucky tray and take a projection. Inspect the film to determine whether the bucky and collimator are still in alignment.

Lubrication

Model QT-750 tables require lubrication at the locations shown in Figures 4-2 and 4-3 at least every twelve months. Model QT-740 requires lubrica-tion at the locations shown in Figure 4-3 at least every twelve months.

Float Top Locking Magnet Check

With power applied to table, check holding force of floating table top in both longitudinal (left-to-right) and transverse (front-to-back) directions. If holding force is not sufficient, adjust Float Top Locking Magnets as fol-lows:

Note: Both the front and rear Longitudinal Magnets must be aligned at the same time.

1. Starting at one corner, lift the phenolic table top up and then gradually pull the top apart from dual-lock tape attached to table rails. Place table top to the side.

2. Loosen the two (2) hex head bolts securing each Longitudinal Magnet Bracket to Transverse Rails.

3. Place Brake Spacer Tool P/N TL10-002 (a piece of 0.020" shim stock), provided with the table, between magnet and Brake Shoe as shown in Figure 4-4).

4. Press float foot pedal. The magnet should release from Brake Shoe. If not, push against magnet until it releases.




5. Slide the Longitudinal Magnet Bracket toward Tabletop Rail until Magnet just contacts the shim. Ensure Brake Pad is parallel with respect to rail.

6. Tighten two (2) hex head screws in Longitudinal Magnet Bracket.

Figure 4-4. Adjusting the Longitudinal (Float) Magnets

LONGITUDINALMAGNET BRACKET

TABLETOPRAIL

SPACER TOOL, LONGITUDINAL BRAKE

TL10-002

MAGNET

SPACER TOOL TL10-002(SEE DETAIL BELOW)

BRAKE SHOE



R4

-cur-

at di-n

en-

n-

sen-

sen-

l" nor-on.

" up al

TROUBLESHOOTING PROCEDURE

The following table provides instructions for troubleshooting various problems that could be encountered on Model QT-740 and/or QT-750 radiographic tables. Refer to Chapter 6, Diagrams for the locations of the LEDs mentioned in this table.

Table 4-1. Troubleshooting Information

PROBLEM/INDICATION TABLE MODEL ACTION

Emergency Shut-off Switch lamp is flashing

QT-750 6-Way Table Control Board AY40-030T contains various status/error LEDs to indicate rent operational status of the table and to identify particular error types. The steps thfollow provide a description of each LED incator and suggests an appropriate action ithe event the indicator is lit.

Error LED D12 (OBS SENS #1) is lit and error LED D53 (EMERG.) is flashing

QT-750 This LED is lit when front left obstruction ssor is activated:1. Remove obstruction.2. Adjust front left obstruction sensor.


QT-750 This LED is lit when rear left obstruction sesor is activated:1. Remove obstruction.2. Adjust rear left obstruction sensor.


QT-750 This LED is lit when front right obstruction sor is activated:1. Remove obstruction.2. Adjust front right obstruction sensor.


QT-750 This LED is lit when rear right obstruction sor is activated:1. Remove obstruction.2. Adjust rear right obstruction sensor.

Status LED D32 (DN LMT) is lit QT-750 This LED is lit when table top is at "normadown limit. No action is required; this is a mal condition when table is in down positi

Status LED D36 (UP LMT) is lit QT-750 This LED is lit when table top is at "normallimit. No action is required; this is a normcondition when table is in up position.



Models QT-Quantum M

Status L

Status L

Error LEerror LEflashing

Error LEsteady switch i

PROB

ED D42 (PEDDIS) is lit QT-750 No action is required; this is a normal condi-tion when Foot Pedal/Operator Control Handle Disable Switch is activated.Pedal/Operator Control Handle disabled = ONPedal/Operator Control Handle enabled = OFF

ED D48 (FLOAT) is lit QT-750 This LED is lit when table top "float" function is not active. No action is required; this is a nor-mal condition when Float Foot Pedal or Opera-tor Control Handle FLOAT Push button is not pushed in.

D D51 (BELTS) is lit and D D53 (EMERG.) is

QT-750 This LED is lit when the Drive or Sync belt sen-sor is activated, or drive motor thermal sensor is activated, or transformer A1T1 input voltage falls below required operational voltage. Per-form following checks:1.Check if a drive belt fault condition occurred

(i.e. snapped or disengaged belt), sensed by normally-closed MOTOR BELT switch S22.

2.Check if a sync belt fault condition occurred (i.e. snapped or disengaged belt), sensed by normally-closed SYNC BELT switch S23.

3.If no belt fault is found, a DC Motor over-temperature fault may have occurred (motor temperature exceeds 70°C), sensed by DC Motor thermal switch S21. Allow DC Motor to cool, then re-check table opera-tion. If still not operating, remove power from table and check S21 with ohmmeter. If open, replace S21.

4.If none of the above, the 20 VAC input from transformer T1 may have dropped below 15% nominal. Check for 110 VAC across ter-minals L1 and L2 on DC Motor Driver Board A2, and also on6-Way Table Control Board A1 connector J1, across pins 15 and 16.

D D53 (EMERG.) is lit and Emergency shut-off s activated.

QT-750 Release Emergency Switch, error light should extinguish.


LEM/INDICATION TABLE MODEL ACTION



R4

down itch ble ent of wn nt, de-(i.e., as ormal

d (i.e., A1R27 on 6-- to tween

s (i.e., is g

ch is indi-ing).nnec-n foot d

ay (pins 14 to

Error LED D56 (U/D LMT) is lit and error LED D53 (EMERG.) is flashing

QT-750 This LED is lit when table top redundantlimit switch S10 or redundant up limit swS8 was activated, indicating excessive taup/down speed or a failure or mis-alignmprimary up limit switch S9 or primary dolimit switch S7. To regain table movemeactivate the activated redundant switch S10 or S8) then move table up or downrequired until table top height is within noperating height range.Check table speed and adjust as requirereadjust MOTOR SPEED potentiometers (Down Motion) and A1R78 (Up Motion) Way Table Control Board A1). It is recommended that the travel time (fully raisedfully lowered) remain in the range of be8-14 seconds.

Status LED D31 (BRAKE) is lit QT-750 Power is applied to three fail-safe brakebrakes are in released state). No actionrequired; this is a normal condition durintable top up/down motion.

Table does not drive up or down; error LED D53 (EMERG.) is flashing.

QT-750 1. Check if the Emergency Shut-off switactivated (Emergency Shut-off switchcator light is illuminated, D53 is flash

2.Check Up foot pedal connections at cotor pins A1J2-1 and A1J2-15 and Dowpedal connections at pins A1J2-11 anA1J2-15.

3.Check for loose pin connection on 6-WTable Control Board A1 connector J1 10 and 2 to DC Motor, and pins 8 andMotor Brake).






Table dodown; enot flas

PROB

es not drive up or rror LED D53 (EMERG.)

hing.

QT-750 1.Verify the following:a. AC supply to DC Motor Driver Board A2

is normal (110 to 120 VAC during standby; 100 VAC when driving up or down).

b. DC supply on DC Motor Driver Board A2 is normal (160 to 165 Vdc during standby; approx. 145 Vdc when driving up or down).

c. A normal "speed command" input volt-age as measured between S1(L) and S2(W) on the DC Motor Driver Board A2 (0 Vdc during standby; between 4.5 and 12.0 Vdc when driving up or down).

2. If above appear normal, and an insufficient sag in the DC occurs, do the following:

a. Disconnect the A+ and A- leads from the Minarik DC Motor Driver Board A2.

b. Measure Ohms across the leads you removed as you command a vertical motion. Once the control relays are activated, the motor armature's input impedance (Low Ohms) should appear on these leads.

c. If no change occurs, the problem is in the current path to the motor. If a low ohms reading does occur and no motion or a slow motion occurs, replace the defective DC Motor Driver Board A2.





R4

h is indi-ing).) and oard

Table and 3. Table and 8 r J3 ).ay

e at

er.AC 0 vac con-switch

ay pins 1

Table and 9.-Way

ectro-

Table drives up and down, but tabletop does not float.

QT-750 1.Check if the Emergency Shut-off switcactivated (Emergency Shut-off switchcator light is illuminated, D53 is flash

2.Check +24 vdc supply fuses A1F1 (8AA1F2 (10A) on 6-Way Table Control BA1.

3.Verify 20 vac is present across 6-Way Control Board A1 connector J5 pins 1

4.Verify +24 vdc is present across 6-WayControl Board A1 connector J3 pins 1(for Transverse Magnet) and connectopins 5 and 6 (for Longitudinal Magnet

5.Check if transistors Q1 and Q3 on 6-WTable Control Board A1 are shorted.

No Power to the Table QT-740,QT-750

1.Check for correct incoming line voltagterminal block TB1-1 and TB1-2.

2.Check line input fuses F1 and F2.3.Check for 115 VAC across TB1-5 and

TB1-9. If not present, replace line filt4.Check 115 vac and 20 vac outputs of

Input Transformer T1: measure for 11across 6-Way Table Control Board A1 nector J1-15 and Emergency Shut-off terminal 1. Measure 20 vac across 6-WTable Control Board A1 connector J5 and 3.

Image Receptor Cabinet lock not working

QT-740,QT-750

1.Verify +24 vdc is present across 6-WayControl Board A1 connector J3 pins 2

2.Check +24 vdc supply fuse A1F1 on 6Table Control Board A1.

3.Check Bucky Switch S15 and bucky elmagnet.






Table drdown; sis lit, eris not lit

Table drdrive upLMT) isLMT) is

Float Toholding

PROB

ives up, does not drive tatus LED D36 (UP LMT) ror LED D56 (U/D LMT)

QT-750 1.While activating Down Foot Pedal, monitor voltage across 6-Way Table Control Board connector J2 pins 11 and 15 to verify opera-tion of Down Pedal Switch S2. Replace switch if faulty. If switch is good, proceed with next step.

2.Check signal at TP6 on 6-Way Table Control Board A1 while activating DOWN foot pedal. It should toggle between high (+15 vdc) when pedal is activated and low (approx. 0 vdc) when pedal is not activated. If not, replace A1 board.

ives down, does not ; status LED D32 (DN

lit, error LED D56 (U/D not lit.

QT-750 1.While activating Up Foot Pedal, monitor volt-age across6-Way Table Control Board connector J2 pins 1 and 15 to verify operation of Up Pedal Switch S1. Replace switch if faulty. If switch is good, proceed with next step.

2.Check signal on TP3 on 6-Way Table Control Board A1 while activating UP foot pedal. It should toggle between high (+15 vdc) when pedal is activated and low (approx. 0 vdc) when pedal is not activated. If not, replace A1 board.

p Locking Magnets not sufficiently.

QT-740,QT-750

Refer to "Float Top Locking Magnet Check" procedure in this chapter for Float Top Locking Magnet adjustment instructions.





R4

REMOVAL/REPLACEMENT PROCEDURES

The following procedures provide step-by-step instructions for removal and replacement of the repairable components in the table.

Replacing the Drive Belt (Model QT-750 Tables Only)

WARNING! Make sure to remove any objects fromthe tabletop before continuing.


2. Remove upper and lower table covers.

3. Install Service Safety Bracket.

4. Remove four (4) hex bolts securing the DC Motor to Table Base Plate (see Figure 4-5).

5. Remove Drive Belt from pulley.

6. Install replacement Drive Belt on pulley.

7. Install, but do not tighten, four (4) hex bolts securing DC Motor to the Table Base Plate.

8. Adjust belt tension by sliding DC Motor toward front end of Table Base Plate. When belt tension is set, tighten DC Motor mounting screws.

Figure 4-5. DC Motor Location

9. Verify Drive Belt Safety Switch is in open position (if not, motor will not operate).

DC MOTOR

DC MOTOR MOUNTING SCREWS (4X)

DRIVE BELT




10. Remove Safety Bracket.

11. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation).

12. Turn on power. Perform an operational test and check table travel and positions.

Replacing the Sync Belt (Model QT-750 Tables Only)

WARNING! Remove any objects from the tabletopbefore continuing.




4. Remove four (4) hex bolts securing the DC Motor to the Table Base Plate (see Figure 4-5).

5. Remove Drive Belt from pulley.

6. Loosen two (2) bolts securing Sync Belt Switch Bracket (see Fig-ure 4-6) and remove Sync Belt Switch Bracket and set aside. (Do not disconnect switch wires).

Figure 4-6. Location of Sync Belt Switch Bracket and Tensioner

BELT TENSIONER

SYNC BELTSWITCH

BRACKET



R4

7. Loosen nut on Belt Tensioner to create slack in belt (see Figure 4-6). If necessary, remove Belt Tensioner to achieve sufficient slack for belt removal.

8. Loosen two (2) 1/4-20 socket head cap screws securing Ball Screw Mounting Block at pulley end of Lead Screw to Base Plate (see Figure 4-7). Gently tap Block to remove it from Lead Screw.

9. Remove Sync Belt from pulleys.

10. Install replacement Sync Belt on pulleys.

11. Verify the distance between Ball Nut Blocks and center Ball Screw Mounting Blocks (see Figure 4-7) are equal (±0.003"). If not, rotate either shaft until distances are equal (within tolerance). This is to ensure equal torque on both Lead Screws.

12. Install Ball Screw Mounting Block on pulley end of Lead Screw and secure to Table Base Plate using two (2) 1/4-20 socket head cap screws.

Figure 4-7. Ball Nut and Screw Mounting Block Locations

13. Re-install Belt Tensioner (if removed). Adjust belt tension as fol-lows:

a. If not already done so, loosen nut on Belt Tensioner.

b. Increase belt tension by adjusting Belt Tensioner downward. The belt is properly tensioned when, at the midpoint of the longest belt span, there is approximately 1/4" deflection.

BALL SCREW MOUNTING BLOCK

CENTER BALL SCREW MOUNTING BLOCKBALL NUT

BLOCKS




c. When belt tension is set, tighten nut on Belt Tensioner.

14. Verify Sync Belt Safety Switch is in open position (if not, motor will not operate).




Replacing the DC Motor (Model QT-750 Tables Only)




4. Cut the two DC Motor wires connected to 6-Way Table Control Board A1 connectors A1J1-12 and A1J1-10.

5. Remove four (4) hex bolts securing the DC Motor to the Table Base Plate (see Figure 4-5).

6. Remove Drive Belt from DC Motor pulley.

7. Loosen set screw securing pulley to motor shaft and remove pul-ley from shaft. Retain pulley (and key) for re-assembly.

8. Slide pulley (with key inserted) onto shaft of replacement DC Motor.

9. Reinstall Drive Belt on DC Motor Pulley.

10. Mount DC Motor to Table Base Plate using four (4) hex bolts.

11. Be sure pulley on DC Motor is aligned with pulley on Lead Screw to within ±1/16". After adjusting pulley position, tighten set screw on DC Motor pulley.

12. Connect replacement DC Motor wires to 6-Way Table Control Board connector A1J1-12 and A1J1-10.

13. Verify Drive Belt Safety Switch is in open position (if not, motor will not operate).






R4

Replacing the DC Motor Driver Board A2 (Model QT-750 Tables Only)

There are two different types of DC Motor Driver Boards used on QT-750 tables; Bodine-manufactured type and Minarik manufactured type. A key distinguishing characteristic to determine the type installed is the electri-cal connector; Bodine uses a DIN type connector having nine screw-down terminals, Minarik uses three separate "STACON" type terminals (see Fig-ures 4-8 and 4-9).

Bodine-Manufactured DC Motor Driver Board Removal/Replace-ment

.

Figure 4-8. DC Motor Driver Board A2 Layout (Bodine-manufactured)

To replace the DC Motor Driver Board A2, proceed as follows:



3. Install Service Safety Bracket (see Figure 4-1).

WARNING! To prevent electrical shock, makesure power is off and all capacitors are dischargedbefore proceeding.

4. Disconnect plug from connector on DC Motor Driver Board A2.

POTENTIOMETERS

SPEED REG.

MAX. SPEED

MIN. SPEED

ACCEL.

TORQUE



Models QT-Quantum M

5. Remove four (4) screws securing DC Motor Driver Board A2 to Board Mounting Bracket and remove board. Retain screws for re-assembly.

6. On replacement DC Motor Driver Board A2, adjust five potentiom-eters as follows (see Figure 4-8):

a. Set ACCEL pot. to mid-range (half-way)

b. Set MIN. SPEED pot. to mid-range (half-way)

c. Set MAX. SPEED pot. to mid-range (half-way)

d. Set TORQUE pot. fully counter-clockwise

e. Set SPEED REG. pot. fully counter-clockwise

7. Set DIP switches 1-8 on DC Motor Driver Board A2 as follows:1 = OFF 5 = ON2 = ON 6 = OFF3 = ON 7 = OFF4 = OFF 8 = ON

8. Position replacement DC Motor Driver Board A2 on Board Mount-ing Bracket and secure using screws removed in previous step.

9. Connect plug into connector on DC Motor Driver Board A2.



12. If necessary, readjust MOTOR SPEED potentiometer A1R27 (Down Speed Motion Control) and MOTOR SPEED potentiometer A1R78 (Up Speed Motion Control) on 6-Way Table Control Board A1. It is recommended that the travel time (fully raised to fully lowered) remain in the range of between 8-14 seconds. Also, the MIN. SPEED and/or MAX. SPEED potentiometers on DC Motor Driver Board A2 may be adjusted to increase/decrease accelera-tion, but do not increase either beyond half-way.




R4

Minarik-Manufactured DC Motor Driver Board Removal/Replace-ment.

Figure 4-9. DC Motor Driver Board A2 Layout (Minarik-manufactured)

To replace the DC Motor Driver Board A2, refer to Figure 4-9 and proceed as follows:



3. Install Service Safety Bracket (see Figure 4-1).

TO A

RM

ATU

RE

via

Con

trol P

CB

(ME

AS

UR

E A

T TP

1 &

TP

2)

TOP

RED

RED/GRN

red

black

-DC

IN

LIN

E V

OL T

AG

E

AC

CEL/D

ECELIR

CO

MP

CU

RR

ENT

LIMIT

MA

X SPEED

+DC

IN

A+

R504

+ C503

R502

D501

Q502

A-

Q501

LWH

S1S2S3

R501

C504

C502

R503

Measure DCSupply Voltagebetween these

two points

160-165 VDC(Sags to 145 VDC during

motor operation)

YEL

BRN/YEL

RED/GRNWHT/BLKBRN

(S1 to S2: +4.5 to +12 VDC when driving up/down)

C CWSTO P

12 o'clock

TRIMPO T

CWSTO P

IR COMPPOTENTIOMETER




Test Poin

AC (~) to AC

DC+ to DC-

S1(L) to S2(W

A+ to A-

TP1 to TP2

WARNING! To prevent electrical shock, makesure power is off and all capacitors are dischargedbefore proceeding.

4. Disconnect seven "STACON" type connectors from terminals on DC Motor Driver Board A2.

5. Remove four (4) screws securing DC Motor Driver Board A2 to Board Mounting Bracket and remove board. Retain screws for re-assembly.

6. On replacement DC Motor Driver Board A2, viewing each potenti-ometer as a clock-face, set the pointers to the following initial o'clock positions, where 12:00 o'clock is pointing straight up (see Figure 4-9), set each as follows:

• Max Speed 6:00 (fully clockwise)• Current Limit 4:00• Accel/Decel 3:30 • IR Comp 4:00

7. Position replacement DC Motor Driver Board A2 on Board Mount-ing Bracket and secure using screws removed in previous step.

8. Re-connect seven STACON connectors to terminals on DC Motor Driver Board A2.


10. Turn on power.

11. On DC Motor Driver Board A2, measure the DC voltage across S1 (L) and S2 (W). Adjust the Motor Speed potentiometer A1R27 (Down) located on Table Control Board A1 (AY40-030T), to 10 seconds when driving table down. Use potentiometer A1R78 (Up) to adjust motor speed to 8 seconds when driving table up (recommended). Any speed between 8-14 seconds is acceptable.

Table 4-2. Minarik DC Motor Driver Board Normal Voltage Levels

ts Location & Function Standby Driving Up or Down

(~) Motor Controller Bridge Rectifier 110 - 120 VAC > 100VAC

Motor Controller Power Supply 160 - 165 Vdc Sags to ~145 Vdc

) Motor Controller Speed Command 0 Vdc +4.5 Vdc to +12.0 Vdc

Motor Controller Output to Motor0 Vdc 70 Vdc (±50 Vdc)

varies with load and speed6-Way Table Control Board A1 Drive IN



R4

12. Following this adjustment, you should obtain:

a. Smooth ramp-up and ramp-down occurring at the beginning and end of each motion command.

b. No tendency to roll backward before forward, when acceler-ating in either direction from either end of the vertical travel range.

13. Adjust IR COMP potentiometer to minimize difference between up and down travel time when table is in either no-load or maxi-mum-load conditions. (see Figure 4-9).


Receptor Cabinet Removal/Replacement

The following procedure is performed with the radiographic portion of the tabletop removed. To remove the radiographic portion of the tabletop, lift up at one corner and pull off tabletop.

WARNING! To prevent electrical shock hazards,make sure power is off before proceeding.

1. On systems equipped with a moving grid (bucky), tag and discon-nect wires connected to bucky terminal strip.

2. Remove eight (8) 10-32 x 1/2" screws securing Receptor Cabinet to Receptor Cabinet Mounting Bracket and remove cabinet.

3. Place new Receptor Cabinet inside Receptor Cabinet Mounting Brackets and install eight (8) 10-32 x 1/2" screws. Do not tighten screws.

4. Position Receptor Cabinet in brackets so that the distance mea-sured from the top of the Table Frame to the top of the receptor cabinet is 4.25" (see Figure 4-10) at all four corners. When this position is achieved, tighten Receptor Cabinet mounting screws.

5. Install radiographic portion of the tabletop. Slide the Receptor Cabinet from one end of the table to the other and ensure that the movement is smooth. If not, re-check measurements as described in the previous step.




Figure 4-10. Correct Distance for Receptor Cabinet Installation

Cassette Tray Removal Procedure

To remove the cassette tray from the housing for cleaning or repair, pro-ceed as follows:

1. Float the tabletop fully back.

2. Pull the cassette tray out by the handle until it stops.

3. Grasp both sides of the tray with your right hand placed near the table and your left hand towards the tray front.

4. Locate the finger hole on the right side of the tray bottom. A spring-loaded plate covers this hole. Press the plate with your right index finger, lift the cassette tray up slightly and pull the tray away from the housing.

4.25"

RECEPTOR CABINET

TABLE TOP FRAME (UPPER FRONT COVER RESTS ON FRAME)



R4

ty d in tem

28

1

1

1

2

11

11

44

22

4

8

11

1

1

1

-

REPLACEMENT PARTS AND ORDERING INFORMATION

Table 4-3 provides a list of replaceable parts for the Models QT-740 and QT-750 tables. Figures 4-11 through 4-23 show the locations of the replaceable parts in the system. Use only original replacement parts, as supplied or recommended by Quantum Medical Imaging.

Table 4-3. Table Replaceable Parts

Item Description Part Number

Model(s) Used On

QUseSys

1 Foot Pedal (Up/Down/Float), Table Up/Dn Limit Switches

EL50-006 QT-740QT-750

2 4-Way Table Control Board AY40-017T QT-740

3 6-Way Table Control Board AY40-030T QT-750

4 AC Transformer EL55-021 QT-740

5 Fuse, 2 Amp (115 VAC Input)Fuse, 1 Amp (230 VAC Input)

EL45-008EL45-007

QT-740

6 Longitudinal MagnetAssembly, Front Side

AY20-062 QT-740QT-750

7 Longitudinal MagnetAssembly, Rear Side

AY20-062-1 QT-740QT-750

8 Transverse Magnet Assembly AY20-057 QT-740QT-750

9 Transverse Bearing(3/8"ID x 7/8"OD)

ME40-018 QT-740QT-750

11

10 Obstruction Switch, Cross-Roll EL50-013 QT-750

11 Longitudinal Bearing(1/4"ID x 3/4"OD)

ME40-026 QT-740QT-750

1

12 Bucky Locking Magnet EL58-004 QT-740QT-750

13 Switch, Emergency Shut Off EL50-009 QT-750

14 LED, Emergency Shut Off EL50-009-1 QT-750

15 Lens, Emergency Shut Off EL50-009-2 QT-750

16(not shown)

Lamp/LED Removal Tool forEmergency Switch

EL50-009-T QT-750



Models QT-Quantum M

1

11

1

1

1

1

11

1

1

1

2

1

1

1

1

1

2

1

ty d in tem

17 Switch, Foot Pedal Disable EL50-014 QT-750

18 Bulb, Blue, Foot Pedal Disable EL50-014-1 QT-740QT-750

19 Operator Control Handle Assem-bly (includes single switch and cable)

AY20-042 QT-740

19 Operator Control Handle Assem-bly (includes dual switches and cable)

AY20-195 QT-750

19a Switch, FLOAT Push Button (part of AY20-042 and AY20-195)

EL50-002 QT-750QT-740

19b Switch, UP/DOWN Rocker (part of AY20-195)

EL50-043 QT-750

20 Receptor Lock Release Lever Han-dle Grip (Gray)

ME30-012 QT-750QT-740

21 AC Transformer EL55-008 QT-750

22 DC Motor Driver Board (Specify Bodine or Minarik type, see Fig-ures 4-8 and 4-9)

EL67-002 QT-750

23 Lead Screw Assembly, Rear AY20-083 QT-750

24 Brake, Fail-Safe, Lead Screw EL80-002 QT-750

25 DC Motor EL66-001 QT-750

26 Belt, Drive ME46-004 QT-750

27 Belt, Sync ME46-005 QT-750

28 Brake, Fail-Safe, Motor EL80-001 QT-750

29 Line Filter EL99-001 QT-750

30 Fuse, 6 Amp (115 VAC Input)Fuse, 3 Amp (230 VAC Input)

EL45-006EL45-009

QT-750

31(not shown)

Bucky Power Cable (35 ft.) EL75-025 QT-740,QT-750


Model(s) Used On

QUseSys



R4

1

1

2

4

4

ds.

ds.

1

1

ty d in tem

32 Switch, Push Button, W/Lens & LED (Auto-Tracking Enable)

EL50-030 QT-750 (w/ QT-AT Option)

33 Potentiometer, 5 Kohms, 5-turn (Auto-Tracking Position)

EL20-012 QT-750 (w/ QT-AT Option)

34 Shim Tool for Longitudinal Locks TL10-002 QT-740QT-750

35 Table Top Corner Bumper Set QT-BMP4 QT-740QT-750

35a Bumper, Table Top Corner (part of QT-BMP4)

ME30-159 QT-740QT-750

36(not shown)

Dual Lock Tape (upper) FA56-001 QT-740QT-750

6 y

37(not shown)

Dual Lock Tape (lower) FA56-002 QT-740QT-750

6 y

38(not shown)

Sound-Proof Mat ME30-081 QT-750

39 Dummy Fuse (shipped separately not installed)

EL45-017 QT-740QT-750


Model(s) Used On

QUseSys



Models QT-Quantum M

ORDERING INFORMATION

To order replacement parts for the table, contact the Service Department at;

Quantum Medical Imaging2002-B Orville Drive NorthRonkonkoma, New York 11779 USAPhone: (631) 567-5800 (x2)Fax: (631) 567-5074e-mail: [email protected]

When ordering replacement parts, supply the following information:

Model and serial number of equipment

Part number

Part description

Quantity required

P.O. Number

Shipping Instructions

When ordering components or parts not listed in Table 4-2, a complete description of the part, including its function and location should be provided with the model number and serial number of the unit.

Contact [email protected] for more information.

Figure 4-11. Replaceable Parts Location Diagram

1

NOTE: Model QT-750 Foot Pedal is shown below; Model QT-740 Foot Pedal has only two switches.



R4



2

54

6,7






8

9



R4



10

11

12






19

1718

20

131415

19a19b

32

3

21

2224

123



R4



30

29

25 28

26

27

33






SPACER TOOL, LONGITUDINAL BRAKE

TL10-002

34

35






Chapter

5-1

DIAGRAMS

5

5-2

Chapter 5 Diagrams

ModeQuan

Figure 5-1. Model QT-740 RadiographicTable Wiring Diagram

1212

55

1110

9

1112

10

11109

8

67

78

6

9

1211109

8

67

78

6

2

45

3

4

23

11 2

3454

23

11

10 10

33

7

98

10

89

7

456 5

6

4

7

89

7

1098

56

4 56

4

23

112

12

23

1

12

1

211 1

2

2

2

1 1

2 2

4 ab

12

49

1

17

1319

15

3 3

1,3

1,34

2

2

23

1

12

3

1

12

2

1

32

115VAC

TB2

GNDLINE

NEUTRAL

TB1

SEE NOTE 2

SEE NOTE 2

F2

F1

DS2D1

PED DIS

TH SWTH SW

BUCKY SW

LM

EXPOSURE BUCKY CONTACT

BUCKY START SIGNALEXPOSURE BUCKY CONTACT

BUCKY GROUND

115VAC RTN

TH SWS6

BM

1N4005 S5

LM TMSC50-003T REV. K

TMTM TM

TH SWS8S7 TH SW

TH SWS9

S10

PEDAL DIS

S11

T1

S4

S3

FLOAT (PEDAL)

J1

S2

FLOAT (PEDAL)

S1

GR

EEN

/YEL

LOW

WHITE

ORANGEGREEN

BLACK

RED

GREEN/YELLOWBUCKY GND

115VAC RTNBUCKY START

BUCKY CONTACTBUCKY CONTACT

115VAC

GREENBLACKWHITE

115VAC/230VACIN

NOTE 1

BLACK

WHITE

GREEN/YELLOWBLACKWHITE

M6M1 M2 M3

- + PEDAL DISABLE SWITCH

M4

RED

M5

BLACK

TABLE CONTROL BOARD

WHITEWHITE

BLACKBROWNBLUE

AY40-017T

4-WAY

A1

ORANGE

ORANGE

18VAC

18VAC

1

8

BLAC

K

RE

D

67

5

34

2

BLAC

K

RED

RED

J1

BLA

CK

BROWN

E-Z GLIDE

COM N/O

RED

BLACKRED

P1

N/O COM

N/O COM

NOTE 3

PU

RP

LEBL

UE

BRO

WN

GR

EEN

BR

OW

N

BR

OW

N

RE

D

YELL

OW

OR

ANG

E

BLAC

K

YELL

OW

OR

ANG

E

LINE INPUT

230 VAC115 VAC

CORD CONNECTED (With Plug) PERMANENT INSTALLATION (Hard Wired to Mains)

2A/250VSLOW BLOWUL LISTED

ALL OTHER CONFIGURATIONS MUST COMPLY WITH NEC OR LOCAL ELECTRICAL CODES


1A/250VSLOW BLOWUL LISTED 1A/250VSLOW BLOWUL LISTED

115 VAC(W/NEUTRAL)

DUMMY FUSE

230 VAC(W/NEUTRAL)

230 VAC(W/O NEUTRAL)

DUMMY FUSE1A/250VSLOW BLOWUL LISTED

QT-740 FUSE USAGE CHART




F1

F2

NOTE 1:

230 VACINPUT

TB1: 6-10TB1: 5-6, 9-10

115 VACINPUT

JUMPER CONFIGURATION OF TERMINAL BLOCKTB1 DEPENDS ON AC LINE INPUT. (SEEMANUAL FOR ADDITIONAL INSTRUCTIONS).

INSTALLJUMPERBETWEEN:

NOTE 2: ALL FUSES MUST BE U.L. LISTED.

NOTE 3:

FOR 115 VAC LINE, USE LINE CORD AY51-170.

FOR INTERNATIONAL (230 VAC) LINE, USE LINE CORD EL75-038; CONNECT AS FOLLOWS: BROWN TO LINE LIGHT BLUE TO NEUTRAL GREEN/YELLOW TO PROTECTIVE EARTH

ls QT-740 & QT-750 - Service Manual Revision Qtum Medical Imaging 5-3

Chapter 5 Diagrams

ModeQuan

Figure 5-2. Model QT-750 RadiographicTable Wiring Diagram

+24V

GREEN/YELLOWTABLE GROUND

BUCKY STARTBUCKY CONTACTBUCKY CONTACTTABLE READY(GND=READY)PBL CONTACTS (NO)PBL CONTACTS (NO)

115VAC RTN

GREEN

YELLOWYELLOW

GREEN

ORANGEREDWHITE

BLACK

YEL

LOW

SEE NOTE 4

(DRAWER SLIDE)

OPTION QT-DDS

COM N/CRED

SC50-001T REV. V

ORANGE

BLACK BLACK

- -

TAN GRAY

- -

TABLE CONTROL BOARD

DRAWER SLIDE SWITCH

N/C

COM

GREEN

BROWNWHITE

YELLOWYELLOW

34

12

-

-GREENBROWN

BLACKCOM

+

RED

PEDAL DISABLE SWITCH

RED+

PINK WHITE

BLACK

J4

6-WAY

37

J3

105

29

RTN

SEE NOTE 4

RED

BR

OW

N

EMERGENCY SWITCH

BLACKGREEN

RED

BLACK115VAC

E Z GLIDE

REDBLACKGREEN

BLU

E

ORGBROWNBROWN

ORG

NOTE 1:

PURPLE

YELLOWORANGE

WHITEBLACK

115VAC/230VACIN

GREEN/YELLOW

BLACK

WHITE

10A, 250VAC

GND

RED

LINE FILTERL1L2 FL1

WHITE

BRO

WN

AY40-030T

8

MOTORBRAKE

BRO

WN

YELL

OW

OR

ANG

E

YELL

OW

RE

D/G

REE

N

MOTOR

DRIVERDC MOTOR

S1EL67-002

WH

ITE

S3S2

GR

EE

N/B

RO

WNTABLE

BRAKE45

BLAC

K

GR

EEN

/BR

OW

N

7NOTE 3:

23

6

RED

1516

14

WHITE/BLACK

BROWN

BROWN/YELLOWA2GREEN

ACAC

I1I2

A-A+

REDBLACK

RED

BLUE12

91

10

1113

BRAKETABLE

23

1

ORANGE

6

+24V

RTN46

+24V

18

RTN

1020

REDBLACK

8

919

18

J1

J2

717

16

BLUE

PU

RP

LE

N/0COM

GREEN

N/0COM

Switch)Up (Bottom

Down (TopSwitch)2

4

515

14

A1

313

12

GRAY/WHITE

1 2 J6

J5 111

YELLOW

GRAY/WHITE

RED N/C

BLACK N/C

COM

N/0YELLOW

N/0ORANGE

COM

GREENCOM

BROWNCOM

Up (Top Switch)

Down (Bottom Switch)

BLACK

110VAC

20VAC

REDORANGE

ORANGE

N/0RED

N/C

GR

AY/W

HIT

E

N/CCOM

COMCOMN/0GRAY

BLUE N/0WHITECOM

PURPLE

N/0BLACKCOM

COM

R4R3115VAC115VAC RTN

EXPOSURE BUCKY CONTACTEXPOSURE BUCKY CONTACTBUCKY START SIGNAL

BUCKY GROUND

S15

BUCKY SWBM2

1N4005D2

BM1

D11N4005 TM TM TM TM

S24

OT

S21

DRIVE BELT

S22

35 35

DS2

LM LM

SYNC BELT

S23

TH SWS17

TH SWS18

TH SWS19 S20

TH SWS24TH SW

S25TH SW

PEDAL DIS

PED DIS

S14

TB2

FLOAT

SW14

J1P1

S16

SW13

LINEGROUND

NEUTRALF1

SEE NOTE 2:

SEE NOTE 2:

TB1F2

35

R1

EMERG SW

DS1

35

R2

1N4005D3

4-62-4305

1N4005D2

FLOAT

S11

FLOAT

S12

UP LMT

DN LMT

S9

OS4

S7

OS3

S6

UP LMT (RDNT)

DN LMT (RDNT)

TB3

T1

S10

S8

OS2

S5

OS1

S4

S3

/DN

S2

/UP

S1

11

10

12

9

1112

1011

5

789 8

67 6

345 4

23 2

9

1112

12

101011

5

78

89

667

34

45

223

1 2

12

3

23

12

3

1

1 1

23

1

2 2

1 1

2 2

1 1

2 2

4 ab

3

12

10 10

1

44

1

2211

33

34

3

12

551

2

33

10

66 778

109 88 9

9 9

7 87

4

65 5

5 65

34

434

21 1

12

212

4

23

1

X1X2

23

2

1

3

1

2

2

3

1

3

2

2

1

3

1

3

34

2

8

67

5

1

444

2

32

32 3

111

2

2

12

3

3

12

2

1

3

1

3

2

1

3

1

3

1

GR

EEN

BLA

CK

WH

ITE

NOTE 5

COM

QT-MATAUTO TRACK ASSY OPTION

BLU

VIO

ORN

YEL

BRN

GRN

RED

BLK

N.C.

AY51-098

N.O.

5KR1

1.2K, 2W 5

J101

LED

POT

YEL

BLUGRN

VIO

12

1011

78

56

2

BRN

SHLDRED

BLK

ORN94

23

1

2

1

3

13

Servo Tracking Pot

QT-ACT (OPTION)

POT

BROWNManual for

Manual forconnection)

connection)

(See Tracking

BLACK

BROWN

RED

BLACK

(See Collimator RED

1 3 1

Collimator Tracking Pot

POT

3R1 1K R2 5K

2 2

NOTE 5:FOR 115 VAC LINE, USE LINE CORD AY51-170.

FOR INTERNATIONAL (230 VAC) LINE,USE LINE CORD EL75-038; CONNECT AS FOLLOWS: BROWN TO LINE LIGHT BLUE TO NEUTRAL GREEN/YELLOW TO PROTECTIVE EARTH

LINE INPUT

230 VAC115 VAC

CORD CONNECTED (With Plug) PERMANENT INSTALLATION (Hard Wired to Mains)


ALL OTHER CONFIGURATIONS MUST COMPLY WITH NEC OR LOCAL ELECTRICAL CODES




115 VAC(W/NEUTRAL)

DUMMY FUSE

230 VAC(W/NEUTRAL)

230 VAC(W/O NEUTRAL)

DUMMY FUSE3A/250VSLOW BLOWUL LISTED

QT-750 FUSE USAGE CHART




F1

F2


Chapter 5 Diagrams

ModeQuan

Figure 5-3. 4-Way Table Control Board A1 (AY40-017T)

R5

100K

D11N759A

Q22N2222A

C70.1u

R10

10K

C9

0.1u

C3

0.1u

D21N4148

U1LMC555CN

GND1

TR2

RST4

CV5

Q3

VCC8

DIS7

THR6

R3

10K

C822u/16V TANTALUM

+

J1

39-29-9106 / 39-29-9102

123456789

10

R1

1K/2WC127000u/50V

+

DB1

MB151W

2

1

3

4 - +

R8

100K

R9

10K

Q32N2222A

Q1IRF530N

R6

100

R7

1.2MC547u/50V

+

F1

10A/SB

R2

1.5K

D3

MUR420 OR MURS320T3

R4

10K

C60.1u

+12VDC

+12VDC

+12VDC

LOCKS RTN (SWITCHED)+24VDC OUT RTN

+24VDC OUT (LOCKS & LAMP)

FLOAT PEDAL SWITCH NO

PEDAL DISABLE SWITCH COM

18VAC IN18VAC IN

+24VDC OUT RTN+24VDC OUT (LOCKS & LAMP)

SC40-017T REV. E


Chapter 5 Diagrams

ModeQuan

Figure 5-4. 6-Way Table Control Board A1(AY40-030T) Test Point Diagram

R23

R25

R73

C20

C3

D11D13

D14

D15

D20

D27

D28

D29

D30

D35

D39

D41

D45

D46

D49

D50

D54

D55

D60

D63

R1

R12

R17

R19

R2

R3

R35

R40

R47

R50

R55

R56

R64

R8

65

65

D70

R76

R26

C35

C36

R80

.Q6

.R73

D34

D23

PC40-030T REV F

TP10EMERGENCY

LIGHT SIGNAL(0 VDC TO +9 VDC)

TP9TABLE TOP FLOAT

45 SEC. TIMER SIGNAL(0 VDC WHEN FLOAT

FUNCTION IS INACTIVE,ABOVE 7.5 VDC FOR 45 SEC.

WHEN FLOAT FUNCTION IS ACTIVE)

TP14UP/DOWN MOTION

24 SEC. TIMER SIGNAL(+15 VDC WHEN UP/DNFUNCTION IS ACTIVE

FOR 24 SEC.)

TP1UP/DOWN MOTORDRIVE DC VOLTAGE

TP2UP/DOWN MOTORDRIVE DC VOLTAGE (APPROX. 160 VDC

FROM TP1 TO TP2WHEN MOTOR ISDRIVING)

TP13COMMON

(GROUND NOT REFERENCEDTO CHASSIS EARTH GROUND)

TP3DRIVE UP LOGIC VOLTAGE

(+15 VDC WHEN ACTIVE =TABLE TOP UP MOTION,

0 VDC WHEN INACTIVE =TABLE TOP AT REST)

TP6DRIVE DOWN LOGIC VOLTAGE

(+15 VDC WHEN ACTIVE =TABLE TOP DOWN MOTION,

0 VDC WHEN INACTIVE =TABLE TOP AT REST)

TP4DRIVE UP RELAY K2

(0 VDC WHEN ACTIVE =TABLE TOP UP MOTION,

+24 VDC WHEN INACTIVE)

TP11+24 VDC(REFERENCED TO COMMON TP13)

TP5DRIVE DOWN RELAY K4(0 VDC WHEN ACTIVE =TABLE TOP DOWN MOTION,+24 VDC WHEN INACTIVE)

TP12+15 VDC

(REFERENCED TO COMMON TP13)

TP8SAFETY BRAKES RELAY K6(+24 VDC WHEN ACTIVE =

TABLE TOP IN MOTION,0 VDC WHEN TABLE TOP

AT REST)

TP7MOTOR INHIBIT RELAY K5(+24 VDC WHEN TABLE TOPIN MOTION, 0 VDC WHENTABLE TOP AT REST)

20 VAC INPUT POWERFOR +24 VDC, +15 VDC,+7.5 VDC SUPPLIES

10A, 250 VAC SLO-BLOF2

+24 VDC TO TABLE LOCKS8A, 250 VAC FAST-BLOF1

FUSE RATING FUNCTION

SEE TABLE 4-1FOR INTERPRETATION OF SLED INDICATOR

POTENTIOMETER A1R78 TABLE UP SPEED ADJUSTCW INCREASES SPEED,CCW REDUCES SPEED

POTENTIOMETER A1R27 TABLE DOWN SPEED ADJUSTCW INCREASES SPEED,CCW REDUCES SPEED


Chapter 5 Diagrams

ModeQuan

Figure 5-5. Table Base Plate Mounting HoleLocations

33.00[838.2]

.500[12.7]

.250[6.4]

.50[12.7]

1.00[25.4]

R FULL2X

4.125[104.7]

8.250[209.5]

3.75[95.3]

16.50[419.1]

5.625[142.9]

11.000[279.4]

2.750[69.9]

1.375[34.9]

2.500[63.5]

6.375

3.00[76.2] DIA

6.000[152.4]

9.000[228.6]

15.750[400.1]

4.00[101.6]

5.000[127.0]

5.00[127.0]

9.38[238.1]

SLOT DIMENSIONS(6 PLACES)

18.75[476.3]


Chapter 5 Diagrams

ModeQuan

Figure 5-6. Installing Digital Image ReceptorUsing QT-FCD Mounting Bracket


Chapter 5 Diagrams

ModeQuan

Figure 5-7. Installing CMT SmartRad DigitalImage Receptor

6-32 x 1/4"BUTTON HEAD

PHILIPS SCREWS AND LOCKWASHERS (6X)

DIGITAL IMAGERECEPTORMOUNTING

BRACKET

MOVEABLECABLE CLAMP

INSTALLATION INSTRUCTIONS FORCMT SMARTRAD DIGITAL IMAGE RECEPTOR

1. Place digital image receptor in Mounting Bracket shown above.

2. Secure receptor to bracket using six (6) 6-32 x 1/4" Button Head Philips Screws and lockwashers.

3. Remove top rear table cover.

4. Remove top section of Moveable Cable Clamp.

7. Align Center Line Indicator Bracket (with label) with center line on image receptor and affix bracket to bottomm surface of image receptor using double-sided tape.

CENTER LINE INDICATOR BRACKET

DIGITAL IMAGERECEPTOR

CABLE

SLOT IN COVER

INSTALLATION INSTRUCTIONS FORCMT SMARTRAD DIGITAL IMAGE RECEPTOR

5. Lay digital receptor cable in Cable Clamp and secure by installing top section of Moveable Cable Clamp on lower section.

6. Re-install top rear table cover while carefully positioning digital receptor cable in cover slot as shown below .


Documents

DC30-007 Quantum QT-740 & QT-750 Service Manual Rev Q