Service manual

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
13-19
Cause
Shading cor-
rection
Poor connector
connection
(between the
CCD unit and
the image
processor
PCB)
CCD unit
Image proces-
sor PCB
Steps
11
12
13
Yes/No
YES
NO
YES
NO
Action
End
Connect the cable firm-
ly.
End
Replace the image
processor PCB.
Checks
Is the trouble resolved when auto-
matic shading correction is per-
formed? (see page 13-9)
Is the flat cable which connects J208
on the image processor PCB and
the CCD unit properly connected?
Is the trouble resolved when the
CCD unit is replaced?
2 Too Dark
Cause
Dirty scanner
assembly
Automatic
shading correc-
tion
Cartridge
High-voltage
contact point
pin on the DC
controller PCB
Developing
bias
Image proces-
sor PCB
Steps
1
2
3
4
5
Yes/No
YES
YES
YES
YES
YES
NO
Action
End
End
End
Repair it. When this is
not possible, replace
the DC controller PCB.
End
Replace the image
processor PCB.
Checks
Is the trouble resolved when the
scanning lamp, reflecting plate, mir-
ror and lens are cleaned?
Is the trouble resolved when auto-
matic shading correction is per-
formed? (see page 13-9)
Is the trouble resolved when the car-
tridge is replaced?
Are problems occurring due to defor-
mity of the high-voltage contact point
pin (JH402) on the DC controller
PCB?
Is the trouble resolved when the DC
controller PCB is replaced?
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