Canon GP160F Service Manual page 254

CHAPTER 13 TROUBLESHOOTING
3 Blank
Cause Steps
1
Cartridge 2
High-voltage 3
contact point
Transfer charg- 4
ing roller
Poor connector 5
contact
(between the
laser scanner
unit and the DC
controller PCB)
Laser scanner 6
unit
High-voltage 7
contact point
pin on the DC
controller PCB
DC controller 8
PCB
Poor connector 9
contact
(between the
CCD unit and
image proces-
sor PCB)
CCD unit 10
Image proces-
sor PCB
13-20
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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?
COPYRIGHT © 1999 CANON INC.
Yes/No
NO Check from Item 9.
YES End
YES Clean the contact
point.
NO Reinstall the transfer
charging roller.
NO Reconnect the connec-
tor.
YES End
YES Repair it. When this is
not possible, replace
the DC controller PCB.
YES End
NO Reconnect the cable.
YES End
NO Replace the image
processor PCB.
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action