Manual Ecografo Eximed Mantenimiento AV-3618 Ok

8/15/2019 Manual Ecografo Eximed Mantenimiento AV-3618 Ok

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AMBIVISION

Portable and Foldaway Portable and Foldaway Portable and Foldaway Portable and Foldaway BBBB

Mode ElectronicMode ElectronicMode ElectronicMode Electronic

Ultrasound ScannerUltrasound ScannerUltrasound ScannerUltrasound Scanner

AV -3608 and AV -3618

Maintenance Guide

Version 1.0

Headquarter

Suite 804 Eastern Commercial Center,397 Hennessy Road,

Hongkong

Phone : +852 2891-6799

Fax : +852 2891-1618

Email : [email protected]

Website : http://www.ambisea.com

China Operations

5A Shuntian Building,62 GuiMiao Road, Nanshan District

Shenzhen City, China 518052

Phone : +86 755-2647-5192

Fax : +86 755-2647-5193

Email : [email protected]

n ed with the DEMO VERSION of CAD-KAS PDF-Editor htt ://www.cadkas.com .

nged with the DEMO VERSION of CAD-KAS PDF-Editor (http://www.cadkas.com).



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MAINTENANCEGUIDEAV-36X8 V1.0

AMBISEA TECHNOLOGYCORP., LTD PAGE 1

Declaration:

Our company doesn’t make any warranty for such materials, including but not limited in implied warranties for

the sales of the apparatus or other purposes.

We shall not be responsible for any possible mistakes inside this document, and incidental or consequential

damages during the connection, operation and use of the apparatus.

This document shall not be taken photos, copied, or translated into other languages without our permission.

We have rights to modify this document without notice.

Liabilities of the manufacturer:

The manufacturer is only responsible for the safety, reliability and usability of the apparatus.

Assembly/disassembly and maintenance of the apparatus shall be operated by the professionals appointed by our

company, while use of the apparatus shall strictly follow the applicable specifications.

The manufacturer is responsible to provide free maintenance for the products under warranty.

As shown in the following table for details:

Parts Warranty period

Main unit 18 months

Mechanical sector-scanning probe 18 months

Adapter 18 months

Any of the following cases will receive no warranty but only paid maintenance:

1. Out of warranty or no proof of purchase;

2. Apparatus damages due to modification or re-adjustment by customers themselves;

3. Apparatus damages due to maintenance by unauthorized personnel;

4. Apparatus damages due to operation/maintenance following out of the user manuals provided by our

company;

5. Apparatus damages due to wrong or improper use or operation;

6. Substituted, altered, or removed original codes/product labels;

7. Apparatus damages due to artificial factors or force majeure.

Our company, in accordance with the fault complaints or requests from our clients, will designate the

corresponding technical staffs to guide the apparatus maintenance or assist completing the check, maintenance or

adjustment of the apparatus.





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Warranty:

For each apparatus sold by our company, the labels and materials are both our exclusive brands, and the technical

parameters are identified with the technical parameters in the user manual. Upon receipt of any complaint during

the warranty period, our company will decide to provide maintenance or apparatus replacement based on the

actual case.

The software and firmware produced by our company is all independently researched and designed by our

company itself and shall be used by our company itself, which means that the software provided by our company

must be applied with the associated firmware provided by our company so as to give good work performance。

Safety labels:

International Electrotechnical Commission (IEC) has established a set of safety labels for medical electrotechnical

equipments and classified various potential risks. The classification and labels are as shown:

External labels of apparatus:

B-mode apparatus

Safety warning! Before you use, please ensure that you have understood the operating

functions that have been introduced in the user manual.

Main power switched on

Main power switched off

Signal input

Signal output

Safe points to be connected with the groundline and the socket

IPX7 Immersion protection

Internal labels of apparatus：：：：

High voltage: voltage over AC1000V or DC 1500V





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Safety Guide:

Isopotential label

The label means: when different apparatus need to be connected, isopotential point should be connected to get into

the same voltage.

Attention: please operate in strict accordance with the manual guide.

Reminder:

The apparatus shall not be applied for family use.

Any unit or individual purchasing the apparatus must strictly follow this Maintenance Guide

for operation, otherwise apparatus damages or injury may happen.

Warning

The apparatus shall not be used as therapy apparatus.

Attention:

This Guide shall be only used for post-sale maintenance by the professionals

authorized by AMBISEA Technology Corp., Ltd.





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Table of Content

1. Product introduction…………………………………………………………………………… 5

1.1 Product introduction and basic functions………………………………………………5

1.2 Technical parameters………………………………………………………………………5

1.2.1 Safety …………………………………………………………………………………5

1.2.2 Monitor types………………………………………………………………………6

1.2.3 Table of technical parameters………………………………………………………6

1.3 Methods of AV-3618 B-mode Diagnostic Apparatus…………………………………7

1.4 Connection of the boards inside the apparatus, and outlook of the material

objects………………………………………………………………………………………7

1.4.1 Monitor board…………………………………………………………………………8

1.4.2 Channel plate…………………………………………………………………………10

1.4.3 DSC board……………………………………………………………………………11

1.4.4 Button panel…………………………………………………………………………12

1.4.5 Power panel…………………………………………………………………………13

1.4.6 Probe…………………………………………………………………………………14

2. Disassembly of AV-3618 B-mode Diagnostic Apparatus…………………………………15

2.1 Disassembly of each part…………………………………………………………………15

2.1.1 Disassembly of front cover…………………………………………………………15

2.1.2 Disassembly of back cover……………………………………………………………16

2.1.3 Disassembly of keyboard and track ball……………………………………………18

2.1.4 Disassembly of front frame…………………………………………………………19

2.1.5 Disassembly of DSC board…………………………………………………………20

2.1.6 Disassembly of channel plate………………………………………………………21

2.1.7 Disassembly of power panel…………………………………………………………21

2.1.8 Disassembly of monitor board……………………………………………………22

2.1.9 Disassembly of back panel……………………………………………………………23

2.1.10 Disassembly of potentiometers……………………………………………………242.2 Assembly of AV-3618 B-mode Diagnostic Apparatus…………………………………25

3. Trouble shooting………………………………………………………………………………27

3.1 Trouble shooting for power supply………………………………………………………27

3.2 Trouble shooting for ultrasonic and system control circuits…………………………28





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1. Product introduction

1.1 Product introduction and basic functions

The apparatus are a kind of high-resolution sector-scanning/linear-array/convex-array scanning diagnostic

apparatus under computer control. As equipped with a digital scan converter (DSC) and applied with the

technologies including variable aperture, multistage dynamic focusing, big-dynamic wideband low-noise head

amplifier, logarithmic compression, TGC control, dynamic filter, edge enhancement, and frame correlation, the

apparatus display clearly, stably and in high resolution.

● Four display modes, namely, B, B+B, B+M and M; 256 grey scale.

● Frozen images, real-time scan, storage, export, zoom-in, color reverse, flip vertical, flip

horizontal, and real-time depth upgrading may be realized. 10 types of posture labels.

● The inbuilt pseudo-color processor outputs in VGA signals, and the video output is

under PAL-D mechanism, able to be externally connected with screen monitors, VGA color monitors,

video recorders, video image printer and other video equipments.

● A touch folded keyboard with a mouse is adopted, rapid, convenient and flexible.

● Molded cover and portable structure; non-industrial frequency transformer switches for

power supply; FPGA and SMT technologies are widely applied; high degree of integration, small

volume, low weight, and low energy consumption.

● Proven safe and effective by clinical verifications.

1.2 Technical parameters

1.2.1 Safety

The apparatus is designed and manufactured strictly following the GB10152-1997 B-mode Ultrasonic Diagnostic

Apparatus, GB9706.1—1995 Medical Electrical Equipment - Part 1 : General Requirements for Safety, and

GB9706.9-1997 Medical Electrical Equipment: Particular Requirements for the Safety of Ultrasonic Medical

Diagnostic and Monitoring Equipment as well as other applicable national standards. In accordance with these

standards, the apparatus are classified as C-level B-mode ultrasonic diagnostic apparatus, and the type of

protection against risks of electric shock is I-type B-mode.

Environmental tests of the apparatus meet the requirements of II-group environmental climatic tests and II-group

environmental mechanical tests of GB/T-14710-93 Environmental requirements and Test Methods for Medical





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Electrical Equipments.

1.2.2 Monitor types

Level of protection against risks of electric shock: Level 1, no inbuilt power supply

Type of protection against risks of electric shock: Level C, B-mode

Immersion protection: no immersion protection

Sterilization method: Refers to the applicable user manual or maintenance guide.

Workability under flammable gas environment: not applicable

Work status: continuously workable

1.2.3 Table of technical parameters

Model AV-3608 AV-3618

Standard probe 3.5MHz electronic linear-array 3.5MHz electronic convex array(R＝

60)

Optional probe5.0MHz mechanical sector-scanning

7.5MHz electronic l inear-array

5.0MHz electronic linear-array

7.5MHz electronic linear-array

6.5MHz electronic convex array(for vagina)

Display depth (mm) 200mm

Maximum detection

depth (mm)≥160

Acoustical

power(C1-2/R60) M

Mode

P- 1.0498mpa

Iob 1.316mw/cm2

Ispta 2.63mw/cm2

lateral

≤3(depth≤80mm)

≤4(80mm＜depth≤130mm)Resolution

(mm)axial

≤2(depth≤80mm)

≤3(80mm＜depth≤130mm)

Blind area (mm) ≤5

horizontal ≤15Geometric

position

PrecisionVertical ≤10

Monitor size 7 inch

Display mode B、B+B、B+M、M

Image grey scale 256 frames

Image multiplier ×1.0, ×1.2, ×1.5, ×2.0

Zoom in 2 times (either real-time or frozen)

Electronic focusing Free grouping of the 4 focuses

Depth upgrading Real-time upgrading of B and B+B modes





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Frame correlation

parameters3 steps adjustable under B and B+B modes

Image flip Vertical, horizontal, and black-white

Functions of

measurement

Distance, circle length, area, heart rate, gestational weeks, fetus weight, and

confinement date

Text remarksDate, serial number of medical record, age, gender, focus grouping, frame correlation

parameters, and full-screen text editor

Posture label 10 types

Maximum energy

consumption70VA

1.3 Methods of AV-3618 B-mode Diagnostic Apparatus

Block Diagram for the Methods of AV-3618 B-mode Diagnostic Apparatus

1.4 Connection of the boards inside the apparatus, and outlook of the material objects

A AV-3618 B-mode Diagnostic Apparatus is constituted by a CRT monitor, a channel plate, a DSC board, a

button panel, and a probe.

send sorting

head

receive sorting,focus andamplify A/D relevant

processingM-mode

address

B-mode

address

access

control grey scale

video

combination

video

synchronization

control frame

RAM

images and

texts

crystal

mouse ke board monitor

CPU D/A





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Block Diagram for the board connection

1.4.1 Monitor board

Outlook of the monitor board

Socket ofcontrast

potentiometer

Socket of VGAsignals

Socket of powersupply

Socket ofdeflection coil

Socket of lightnesspotentiometer

Cavity

cap

Socket ofimage tube





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The following is the introduction to some debug points and signal connections on the monitor board:

CT203： signal input CT202：contrast potentiometer (main)

UR202： contrast potentiometer（associated）

VR301： field amplitude potentiometer VR302：field linear potentiometer

UR401： field frequency potentiometer (main)

UR402： field frequency potentiometer (associated) L501：line amplitude regulator

CT501： deflection coil socket

UR501： lightness potentiometer (associated) CT502：lightness potentiometer (main)

T501： line output transformer

UR503： focusing potentiometer CT601：Power supply

UR601： Voltage regulating potentiometer for main power supply

Warning There is high voltage in the monitor. When power switched on,

carefully operate and avoid touching the cavity cap and the surrounding area.





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1.4.2 Channel board

Debug points and signal connection of the channel board

Debug points and signal connection ports of the channel board:

XS1: 96-chip probe socket

XS2: control signal input of the DSC board

XS4: GND, ＋8V, －8V, and GND(from left to right) for power supply I

XS5: STC and VBP control input

XS8: simulated echo signal output

XS9: port for overall gain potentiometer

W1 ：K73 reference voltage regulator

W2: channel gain regulator

W3 ：under color regulator

W4, W5 ：VBP amplitude regulators

XS12：GND, ＋12V, ＋5V, ＋120V, －120V, GND, NC, and NC (from left to right) for power supply II

XS8simulated echosignal output

XS4power socket

I

XS5

STC and VBP

control input X S 9 p or t f or

o v e r a l l g a i n

p o t e n t i om e t e r

XS2 DSC controlsignal input

XS2 DSC control

signal input

W4 and W5

VBP amplitude

regulators

W 3 un d e r c ol or

r e g ul a t or

W

2 c h a nn e l g a i n

r e g ul a t or

W1 K 7 3 r e f e r e n c e

v ol t a g e r e g ul a t or

XS1 96-chip probe





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1.4.3 DSC board

Debug points and signal connection of the DSC board

Debug points and signal connection ports of the DSC board:

RP1: D/A voltage regulating potentiometer for VBP and STC signals

RP2: D/A voltage regulating potentiometer for VGA signals

RP3: D/A voltage regulating potentiometer for echo signals

XS1: Control data output port

XS3: Simulated echo signal input

XS4: PLA-D video output

XS5: PLA-D video output

XS6: Matrix keyboard socket

XS7 and XS10：Colorful VGA signal output

XS8 ：Black and white VGA signal output

XS11：VBP and STC outputs

XS12：Track ball socket

XS14：Power sockets respectively for GND, ＋5V, ＋8V, －8V, and GND(from up to down)

XS6 Matrixkeyboard

socket

RP2 D/A voltageregulatingpotentiometer forVGA signals

XS4 and XS5:PLA-D videooutputs

XS8 Blackand whiteVGA signaloutput

XS1Control dataoutput port

XS11VBP andSTC output

XS12 Track

ball socket

XS14Power socket

XS7 and XS10Colorful VGAsignal output

XS3 Simulatedecho signal

input

RP3 D/A voltageregulatingpotentiometer forecho si nals

RP1 D/A voltageregulatingpotentiometer forVBP and STCsignals





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Attention：：：：DSC board must be used with its associated channel board.

Warning Don’t adjust the potentiometer on the boards, because the

indexes of the boards have been set at the best status. Adjustment must be operated by

authorized professionals with professional equipments.

1.4.4 Button panel

Outlook of the button panel

Assembly of the track ball Connection ports of the button panel (back side)

Connection ports of the button panel

Signal output of

the track ball

Input/Output port ofthe button panel

signal line for thebutton of thetrack ball





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1.4.5 Power panel

Outlook of the power panel

Connections ports of the power panel

AC input socket Powersupply I for the channelboard

Power supply I forthe channel board

Power supply forthe DSC board

Power supply II forthe channel board

Power supply forthe monitor





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1.4.6 Probe

Outlook of the probe





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2. Disassembly of AV-3618 B-mode Diagnostic Apparatus

2.1 Disassembly of each part

2.1.1 Disassembly of front cover:

Step 1

Step 2

Step 3

Remove these 3 rubber

plugs, and then use a cross

head driver to remove the 3

screws inside

Use a cross head driver to

remove the 3 screws

Firstly remove this cover

Front cover





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Step 4

2.1.2 Disassembly of back cover:

Step 1

Step 2

Remove the front cover.

Disassembly completed.

Firstl remove this cover


remove the 3 screws





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Step 3

Step 4

Step 5

Remove the foot pads

Remove the 4 rubber plugs

Remove the back cover.



remove the 6 screws inside





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2.1.3 Disassembly of keyboard and track ball

Step 1

Step 2

Step 3

Firstly remove the 4 rubber

plugs, and then use a cross

head driver to remove the 4

screws inside

Remove the upper frame of the

button panel. (the upper frame is

applied with a catcher design

with 6 catching positions as

shown in Step 3. in case of upper

frame removal, tools are required

to open the catcher)

Rotate the cap of the trackball and remove it

The circled area is for the

catching positions.

Remove the keyboard.






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Step 4

Step 5

2.1.4 Disassembly of front frame:

Step 1


remove the 4 screws inside


remove the 2 screws in the right

side of the front frame


remove the 2 screws

Remove the track ball

board.


Remove the track ball

Dispatch the cap of

the track ball





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Step 2

Step 3

2.1.5 Disassembly of DSC board:

Firstly remove all signal wires


remove the 4 screws

Remove the DSC board.



remove the 2 screws in theright side of the front frame

Use a cross head driver to remove

the 2 screws at the top of the front

frame

Remove the connection wires of

the potentiometer and the button

panel

Remove the front frame.

Disassembly completed





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2.1.6 Disassembly of channel plate:

2.1.7 Disassembly of power panel:

Step 1

Step 2

Firstly remove all signal wires


remove the 4 screws


remove the 4 screws

Firstly remove all wires for

power supply

Use a cross head driver

to remove the 4 screws

Remove the channel board.






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Step 2

2.1.10 Disassembly of potentiometers:

Step 1

Remove the signal wire

Solder off the inputpower supply wire

Solder off the power

supply wire of the fan

Remove the back cover.


Remove the knob of the

contrast potentiometer


lightness potentiometer


overall gain potentiometer





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Step 2

2.2 Assembly of AV-3618 B-mode Diagnostic Apparatus

Assembly of the AV-3618 B-mode ultrasonic apparatus is the reverse process of disassembly.

During assembly process, wires shall follow the routes of the original wires (so as to avoid inter-disturbance

among wires), and be well tied. Ensure the socket is well touched and properly connected; also ensure the screws

are stably installed. Then switch on the power for a trial run. With power on, check whether there is any wrong

connection, whether the apparatus functions well, and whether there is unusual phenomenon.

Before you assemble the cover, carefully ensure there is no more mistake or omission.

After you assemble the cover, re-check the apparatus with power on. If there is no mistake during about one hour

of aging test, the apparatus can be delivered for use.

Use a spanner to

remove the nuts

Remove the potentiometers

from the back side.






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Attention:

１１１１. Before you disassemble or assemble the apparatus, please ensure that you have

been familiar with the inter-relationship among various modules.

２２２２. As there are quite an amount of internal connection wires, please remember the

right positions of the connection wires to be disassembled, and if necessary,

remark them.

３３３３. Under some special connection, please pay attention to the direction of the

connection in stead of the reverse direction. DO READ this Guide before you

start operation.





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3. Trouble shooting

Typical failures of AV-3618 and the possible reasons

3.1Trouble shooting for power supply:

AV-3618 power supply circuits are used to supply stable DC voltages of ±5V, ±8V, +12V and ±80V to the system.

1.Main reasons for the failure of power supply are as follows:

（1） short circuit or leakage happening with the load of the DC power supply, causing elements of the

power supply circuit to be overheated and burnt;

（2） low overload capacity of the integrated circuit, diode, and/or triode, easy to be damages under instant

over-voltage under-voltage, or voltage fluctuating, or other casual cases;

（3） amount of use of electrolytic capacitors, whose service lives are limited; if the electrolytic capacitors

work under high temperature for long time, they will easily be damaged in three years. (Thus it is

suggested to replace the electrolytic capacitors within four or five years)

2. Typical failures and possible reasons

Mainly 5 types of typical failure of power supply: ①no output voltage; ①low output voltage; ①high output voltage;

①fluctuating of output voltage; ①loud output noises. The 5 types of failure may happen to various DC manostat

circuits, and the elements causing these failures are mainly the integrated circuit, diode, and triode，as well as

damaged electrolytic capacitors.

(1) main reasons for no output voltage:

No AC power supply; damages to the rectifiers bridge D1; damages to switch tube Q1; short circuit happening to

the turn-to-turn for switch and voltage transformation; damage to the main manostat circuit; damage to the

high-frequency rectifier diode DD 1 (totally no output), DD5 (no -120V output), DD4 (no +120V output),

DD2-DD3 (no -8V output), and DD6-DD7 (no +5V output); damage to LDO IC5 (no +5V output), IC3 (no -8V

output); and damages to DC/DC integrated circuit IC6 (no +5V output), and IC4 (no +8V output).

(2) main reasons for low output voltage:

Short circuit happening with the load; over-leakage or capacity reduction happening with the filtering capacitor;

short circuit happening with DZ1; resistance increase happening with the sampling circuits VR1 and R25;

damages to AFC Q5; damage to the optocoupler IC1; resistance increase of R5. Reasons for low output from

DC/DC+5V: damages to R18 and R19; damages to IC5 and IC6; reasons for low output from DC/DC+8V:





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damages to R26, R28, and R29; damage to IC4; reasons for low output from -8V: damage to IC3.

(3) main reasons for high output voltage:

Damage to the sampling circuit VR1; resistance increase of R24; damage to the open circuit DZl; damages to AFC

Q5; damage to the optocoupler IC1; and failure of the PWM control circuit. Reasons for high output from

DC/DC+5V: damages to R18 and R19; damages to IC5 and IC6; reasons for high output from DC/DC+8V:

damages to R26, R28, and R29; damage to IC4; reasons for high output from -8V: damage to IC3.

(4) main reasons for the fluctuating of output voltage:

Capacity reduction or failure of the filtering capacitor, or damages to the filtering capacitor; worsened sampling

stability; worsened stability of the PWM control circuit; worsened stability of the optocoupler IC1; and damages

to IC3, IC4, IC 5 or IC6.

(5) main reasons for loud output noises

Capacity reduction or failure of the filtering capacitor, or damages to the filtering capacitor; worsened sampling

stability; worsened stability of the PWM control circuit; worsened stability of the optocoupler IC1; and damages

to IC3, IC4, IC 5 or IC6.

3.2 Trouble shooting for ultrasonic and system control circuits:

1. Failures: No display of any images, texts, or symbols on the monitor. Black screen.

（1）Possible reasons

① no power supply for the monitor;

① failure of the LCD screen;

① improper connection between the main unit and the monitor;

① no power supply for the main unit;

① failure of the main unit.

（2）Trouble shooting methods

①Firstly check the connection between the main unit and the monitor; in case of proper connection,

use external monitor to check whether there is video signal output in the main unit, if there is

display, where the problem happens shall be the monitor.

①Check the power input of the monitor; in case there is input, firstly check the lightness and contrast

potentiometers; if the potentiometers have failed, replace them; otherwise where the problem





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happens shall be the monitor board, and you shall repair or replace the monitor board.

①If there is no display on the external monitor, where the problem happens shall be the main unit.

Then you check the power input of the DSC board; if the input works, repair or replace the DSC board.

2. Failures: No ultrasonic images are displayed on the screen under any scan method, while the

display for grey scale and texts is proper.

（1）Possible reasons:

① no echo signal output in the channel board;

① failure of some A/D converting circuits in the DSC board;

① failure of some image processing circuits in the DSC board;

（2）Trouble shooting methods:

①Firstly check the echo signal output in the channel part; if there is output, where the problem

happens shall be the DSC part; otherwise where the problem happens shall be the channel board part.

①If there is no echo signal output in the channels board, where the problem happens shall mostly be

the signal channels and the relevant ±8V power source. The signal channels include the gain

control circuit (V39, V1, V27, V8, V9, and V32), logarithmic amplification and detection circuit

(U18, U19, U20, V13, V14, and V15), and the edge enhancement circuit (U21, U22, U23, U24,

and U25). To clarify the level where the problem happens, you may test the wave shapes of the

outputs of various transistors or integrated circuits, and make the judgment by observing.

①If there is echo output in the channel board, where the problem happens shall be the DSC part. The

focus here is the check to the A/D converting circuit, the main memory, the control circuit, and the

image processing circuit. As the display for grey scale and texts is proper, the D/A circuit and its

successive circuits are proper.

① Display of images are also affected by the single chip computer D4, thus the check shall also be

done to the single chip computer. Check to the single chip computer is mainly under two methods,

replacement method and characteristics testing method. During your measurement, you shall pay

attention to the wave shape and level property of the control signals from the image processing

circuit under the control of the single chip computer.

① Repair or replace the board(s) with problems.

3. Failures: Lack of echo in the vertical direction of screen scanning





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Lack of echo in the vertical direction of screen scanning ( means that part of scan lines have no reflecting waves

or have weak reflecting waves, shown by black vertical lines of shadows in the acoustic window, and low

sensitivity during the total picture display process.


①Failure of the transmitting circuit;

①Failure of the +120V power supply circuit;

① Failure of the ultrasonic probe;

① Improper connection with the probe socket;

① Failure of the pre-amplifier.

（2）Trouble shooting methods:

① Check whether the probe socket is properly connected, and based on the lack of scan echo and low

sensitivity, focus on the performance of the probe; if the crystal of the probe is moistured, or the

control circuit inside the probe is damages, weakening of transmitting/receiving functions will

happen. You may consider to get a probe of the same model for replacement, so as to judge

whether the probe is the trouble source.

① If the judgment result is that the trouble source is the main unit, you shall focus on the transmitting

circuit and the transmitting control circuit of the signal plate, and shall mainly consider whether the

transmitting-pulse generating circuit works properly in the way of checking the 5V, +12V, +120V,

and -120V power supply for the channel board.

① If the power supply are all under proper voltages, where the problem happens shall be the

transmitting-pulse generating circuit and the transmitting control circuit.

① If the lacked echo shows as a black vertical line, where the problem happens shall be the

transmitting control circuit. You may focus on the control signal channel (CN1-CN5), specifically,

the route(s) without control pulse output.

① If the lacked echo shows as 4 (or multiples of 4) black vertical lines, where the problem happens

shall be the transmitting-pulse generating circuit or pre-amplifier circuit. You may firstly check the

wave shapes outputted from the various routes of the transmitting-pulse generating circuit,

specifically, the route(s) without control pulse output. If the transmitting-pulse generating circuit

outputs proper wave shapes, you shall subsequently check the pre-amplifier circuit, specifically, the





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route(s) without pulse output or with improper pulse output.

① Repair or replace the board(s) with problems.

4. Failures: No texts are displayed, while the display for images is proper.


① failure of part of the text memory in the DSC board;

① failure of part of the image processing chip in the DSC board;

① failure of part of the single unit computer in the DSC board.

5. Failures: Image rolling on the monitor (i.e., no synchronization between the line and the field)


① failure of sync separation of the monitor;

① no line-field sync signal output from the image processing unit of the DSC board;

① failure of pseudo-color processing of the DSC board and converting of VGA

6. Failures: The keyboard makes no input.


① failure of the buttons in the keyboard;

① failure of the keyboard port circuit in the DSC part;

① failure of the single chip computer in the DSC part;

① failure of power supply to the keyboard port.

7. Failures: The track ball has no reaction.


① no power supply for the track ball;

①failure of the track ball;

① failure of the serial communication circuit of the track ball in the DSC board.

8. Failures: Failure of video playback.


① Failure of the video replay memory in the DSC board;

① Failure of the image processing chip in the DSC board.





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9. Failures:Non-periodical image twinkling.


① Damage to the lightness potentiometer;

①Damage to the contrast potentiometer;

①Failure of the monitor board.

10. Failures: A horizontal or vertical bright line shown on the monitor.


①Failure of the monitor board;

①Failure of the deflection coil of the monitor.



Documents

Manual Ecografo Eximed Mantenimiento AV-3618 Ok