Service manual

Samsung Electronics 1-1
PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE
6. REPAIR
6-1. SCANNER
Black data when
you scan or copy
Bright image
Dark image
Lamp blinks
Cannot turn on the
lamp
Overlapped or omit-
ted image when you
scan or copy
Black in whole
when you scan or
copy
White lines when
you scan/copy.
Does the lamp operate normally while
shuttle module operates?
Check if white ref. panel is too dirty.
1. Is the lamp supplied with appropri-
ate power when the scanner oper-
ates?
2. Does the output of module satisfy
specifications?
3. Does (-)Vref value satisfy specifica-
tions?
Check power of the lamp. (12V serial
connection)
Check the power of the lamp. (12V
serial connection)
Check scan connector on circuit board.
Check if screws of CR fixing part are
loose.
Check if LF connector is properly
connected.
Check the scanner of the main board.
Check scanner cable.
Check the scanner.
Check if there is foreign substances on
LABEL(P)-REFERENCE.
- Check module lamp.
- Check FPC of the main board & module.
(J1-1<=> CON2-1: LAMP ON)
- Check the path of the main board.
(U17[#10]->R185[1K]-Q8->R262->Q7-
> CON2[#1])
- Replace module.
- Replace the main board.
- Clean white ref. panel.
- Replace white ref. panel.
1. Check the lamp-on level of module
and the main board.(+11.75V/ + 5V)
(J1-1<=> CON2-1: LAMP ON)
2. Check video signal output of module
and main board.
3. Check (-) Vref value.
Replace FPC-SCAN connecting power
of the lamp.
Replace the scanner.
Check the power of the lamp.
Replace the scanner. Connect the
connector.
Screw down
Connect LF connector.
Replace the main board.
Replace FPC-SCAN.
Replace the scanner.
Wipe LABEL(P)-REFERENCE.