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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