COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
13-21
4
Solid black
Cause
Scanning lamp
Cartridge (pri-
mary charging
roller bias fault)
Cartridge
High-voltage
contact point of
the DC con-
troller PCB
CCD unit
Image proces-
sor PCB
Steps
1
2
3
4
5
Yes/No
NO
YES
YES
YES
YES
NO
Action
See the “Scanning lamp
does not light” section.
Clean the contact
point.
End
Repair it. When this is
not possible, replace
the DC controller PCB.
End
Replace the image
processor PCB.
Checks
Is the scanning lamp lit while copy-
ing?
Is there dirt on the contact point that
supplies high-voltage to the car-
tridge?
Is the trouble resolved when the car-
tridge is replaced?
Are problems occurring due to defor-
mity of the high-voltage contact point
pin JH401 on the DC controller
PCB?
Is the trouble resolved when the
CCD unit is replaced?
5
Polka dots
Cause
Cartridge (pho-
tosensitive
drum)
Transfer charg-
ing roller
Static charge
eliminator
Re-charging
eliminator
DC controller
PCB
Steps
1
2
3
4
5
Yes/No
YES
YES
YES
YES
YES
NO
Action
Replace the cartridge.
Clean the roller. If it is
scratched, replace it.
Clean the static charge
eliminator.
Clean the re-charging
eliminator.
Repair it.
Replace the DC con-
troller PCB.
Checks
Is the surface of the photosensitive
drum scratched?
Is the transfer charging roller dirty?
Is the static charge eliminator dirty?
Is the re-charging eliminator dirty?
Are problems occurring due to defor-
mity of the high-voltage contact point
pin JH401 on the DC controller PCB?
Summary of Contents for GP160DF
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