Service manual

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
13-20
3 Blank
Cause
Cartridge
High-voltage
contact point
Transfer charg-
ing roller
Poor connector
contact
(between the
laser scanner
unit and the DC
controller PCB)
Laser scanner
unit
High-voltage
contact point
pin on the DC
controller PCB
DC controller
PCB
Poor connector
contact
(between the
CCD unit and
image proces-
sor PCB)
CCD unit
Image proces-
sor PCB
Steps
1
2
3
4
5
6
7
8
9
10
Yes/No
NO
YES
YES
NO
NO
YES
YES
YES
NO
YES
NO
Action
Check from Item 9.
End
Clean the contact
point.
Reinstall the transfer
charging roller.
Reconnect the connec-
tor.
End
Repair it. When this is
not possible, replace
the DC controller PCB.
End
Reconnect the cable.
End
Replace the image
processor PCB.
Checks
Make a test print following the direc-
tions on page 13-120. Is the output
image blank?
Is the trouble resolved when the car-
tridge is replaced?
Is there dirt on the contact point that
supplies high-voltage to the car-
tridge? (Remove the cartridge and
check.)
Is the transfer charging roller proper-
ly installed?
Check the contact between connec-
tor J304 on the DC controller PCB
and the laser scanner unit. Is it prop-
erly connected?
Is the trouble resolved when the
laser scanner unit is replaced?
Are troubles occurring due to defor-
mity of the high-voltage contact point
pins (JH401, JH402, JH403) on the
DC controller PCB?
Is the trouble resolved when the DC
controller PCB is replaced?
Check the connection of the flat
cable between connector J208 on
the image processor PCB and the
CCD unit. Is it properly connected?
Is the trouble resolved when the
CCD unit is replaced?
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