The Copy Has White Spots (Vertical); The Copy Has White Lines (Vertical) - Canon GP605 Service Manual

10

The copy has white spots (vertical).

11

The copy has white lines (vertical).

Cause Step
Copy paper
Dust-proofing
glass
Scanner (dirt)
Photosensitive
drum
Developing
assembly
Fixing assembly
Transfer/
separation
charging
assembly,
Pre-transfer
charging
assembly
COPYRIGHT © 1999 CANON INC.
1 Try copy paper fresh out of package. Is
the problem corrected?
2 Clean the dust-proofing glass. Is the
problem corrected?
3 Does the problem occur in copy images
only?
4 Are there scratches in the peripheral
direction of the photosensitive drum
corresponding to the problem in the
image?
5 Is the toner on the developing cylinder in
an even coating?
6 Using the door switch actuator, generate a
test print PG-TYPE8 (solid black) while
keeping the front cover open.
Turn off the power switch immediately
before copy paper enters the fixing
assembly, and check the image. Is the
image normal?
7 Clean the pre-transfer charging assembly
and the transfer/separation charging
assembly. Is the problem corrected?
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Checks Yes/No Action
YES The copy paper may be
moist. Instruct the user
on the correct method
of storing paper.
YES End.
YES The cause is between
the scanner and CCD:
1. Check the standard
white plate for dirt.
2. Execute
COPIER>FUNCTION
>CCD>CCD-ADJ
in service mode.
YES Find out the cause of
the scratches; then,
replace the
photosensitive drum.
NO Check the edge of the
blade of the developing
assembly for paper lint
or the like.
YES The cause is after the
fixing system; check
the following:
1. fixing upper roller
for offset.
YES End.
NO Perform the following:
1. Change the setting
of the following in
service mode:
COPIER>OPTION>
BODY>TRNSG-SW.
2. Change the setting
of the following in
service mode:
COPIER>OPTOIN>
BODY>FUZZY.
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