Brother SCANNERII Troubleshooting guide

SERVICE MANUAL

PARTS LIST

SCANNERII

12.1997

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Table of Contents

∗

Service Manual

I.Main Configuration..........................................................................2

II.Disassembling the SCANNER........................................................5

III.Setting the Scanner Adjustment and Test Mode..........................7

IV.Diagnosing a Breakdown in the Electrical System......................9

∗

Parts List.....................................................................................................13

nGENERAL INFORMATION

This service manual has been compiled for explaining repair procedures of the SCANNER.

This was produced based on up-to-date product specifications at the time of issue, but there may have

been changes of specifications for the purpose of improvements.

Contact manufacturer or local sales company for information concerning such changes.

lCAUTION l

1.Always use rubber gloves when handling printed circuit boards and never touch the metal portion of a

printed circuit board with bare hands.

2.Keep your body earthed in order to avoid generating static electricity.

3.Pack printed circuit boards in aluminum foil and avoid subjecting them to any form of impact during

storage or transportation.

4.Do not touch or damage the metal portion of a printed circuit board with a screwdriver or any other tool

while making repairs or the like.

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I.Main Configuration

1. Main Components

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2. Control System Block Diagram

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Selecting the language

•

Turn off the unit, then enter the language mode by holding down the three middle buttons while turning

on the unit.

The language mode screens change in the following order: I →II →III.

This mode ends if JAPANESE, ENGLISH or KOREAN is chosen.

‚

When screen II of the language mode is displayed, select the language with ↑and ↓, then press

ENTER .

∗If NEXT PAGE is pressed, another screen showing more languages is displayed.

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II.Disassembling the SCANNER

•Remove the scanner guide cover.

‚Remove the cover from the battery compartment, and take out the six batteries. (Skip this step if there

are no batteries in the compartment.)

ƒRemove the four screws from the bottom of the compartment, lift up the main body of the scanner, and

remove the two connectors.

„Remove the four screws securing the main PC board assembly and take out the assembly.

…Disconnect the scanner connector from the main PC board assembly.

†Remove the cord guide from the main body of the scanner, and disconnect the scanner connector from

the main body.

‡Remove the four screws that secure the LCD module to the main body of the scanner, and take off the

LCD module.

ˆRemove the four screws that secure the battery holder to the main body, and take off the battery holder.

Fig. 1 Connecting the LCD module leads to the main PC board assembly

Fig. 2 Arranging the cables for the Scanner B5N-1771

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III.Setting the Scanner Adjustment and Test Mode

∗With this equipment, because each scanner has its own individual characteristics and these are stored

in the memory element in the main PC board assembly, scanner adjustment and testing should always

be carried out if only the main PC board assembly is being replaced, or if the scanner (B5N-1771) is

being replaced. In any other case, the adjustment has already been made at the factory before the unit

is shipped, and does not need to be done again.

[Items Required for Adjustment]

Adjusting the scanner requires that the test picture be read. Copy the test picture found on page 8, and cut

out the picture along the dotted lines.

[Starting Up the Test Mode]

Pressing the main power switch while holding down the highest and lowest of the five operation switches

puts the scanner in the Adjustment and Test Mode.

[Adjusting the Scanner]

•Set the test picture on the glass plate (see Fig. 1).

‚Press the SCAN button. (The buzzer will sound once.)

ƒScan the test picture while holding down the scanner button.

„Press the SCAN button. (The buzzer will sound twice.)

…Scan the test picture once again while holding down the scanner button.

∗If there have been no internal problems with the adjustment at the point where step …is completed, the

power supply will shut off automatically.

If a message reading "No original found" is displayed after step ƒor step …, press the

button and repeat the procedure starting from step ‚. If the above message appears, the test picture

may not have been placed on the glass plate in the correct position.

Fig. 1

CORRECT

&REDO

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Test picture

Copy the picture and cut along the dotted lines.

(The size should be W125 mm ×H143 mm.)

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IV.Diagnosing a Breakdown in the Electrical System

Diagnosing a breakdown in the electrical components

* See the illustration for locations which should be checked.

Situation Locating the Problem Solutions

•No buzzer sounds when the

main power switch is

pressed, and nothing

appears on the LCD display.

•Have the batteries been inserted

correctly?

‚Has the fuse blown?

ƒAre the battery holder and main PC

board assembly connected, or has the

wiring to the main PC board assembly

been disconnected?

„If the AC adaptor has been plugged into

a wall outlet, is the DC plug output

between 9.5 and 14 VDC (if an AC

adaptor is being used)?

…Other Points to Check

•Check carefully.

‚Replace the fuse.

(First check to see why the fuse

has blown, and correct the

problem.)

ƒReplace the terminal plate

assembly.

„Replace the AC adaptor.

…Replace the main PC board

assembly.

‚The LCD display does not

function correctly.

•Has the LCD contrast adjustment knob

been adjusted?

‚Have the LCD module and the main PC

board assembly been connected, or are

there any disconnected lead assemblies?

ƒWhen the LCD module connector (P5) is

disconnected from the main PC board

assembly, is the voltage between 1 and

2, and between 3 and 2, correct?

Between 1 and 2: -8 to -20 VDC

Between 3 and 2: 5 VDC

„Check other points carefully.

•Check carefully.

‚Replace the lead assembly.

ƒReplace the main PC board

assembly.

„Replace the main PC board

assembly or the LCD module.

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