Canon GP160DF Service Manual page 257

8 Vertical Fogging
Cause Steps
Exposure sys-
tem
Cartridge
External light
9 Fuzzy Horizontal Black Lines
Cause Steps
Connection
fault due to
poor contact of
the flat cable
Poor drum sen-
sitivity of the
developer cylin-
der drum
Fixing
assembly
10 Dirt
Cause Steps
Copyboard
glass
Toner spillage
Fixing assem-
bly
Cartridge
COPYRIGHT © 1999 CANON INC.
Checks
1 Make a test print following the direc-
tions on page 13-120. Is the output
image normal?
2 Is the trouble resolved when the car-
tridge is replaced?
Checks
1 Is the flat cable connecting the
inverter PCB and the image proces-
sor PCB almost broken?
2 Is the trouble resolved when the car-
tridge is replaced?
Checks
1 Make several copies consecutively.
Does the dirt always occur in the
same place?
2 Does the dirt occur at random?
3 Does the dirt's cycle occur at an
approximately 75mm pitch?
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Yes/No Action
YES Clean the copyboard
glass, mirrors 1 to 4
and the lens.
YES End
NO Check that no external
light is reaching the
photosensitive drum.
Yes/No Action
YES Replace the cable.
YES End
NO Replace the fixing
assembly.
Yes/No Action
YES Clean the copyboard
glass.
YES Check if toner is spilling
from the cartridge.
YES Replace the fixing
assembly.
NO Replace the cartridge.
13-23