Canon CP660 Service Manual page 301

5 The print has a soiled image/soiled back.
Cause Step
Cassette pick- 1
up roller,
Registration
roller, Lower
fixing roller,
Feeding roller 1/,
Etc.
Secondary 2
transfer belt
assembly,
Fixing inlet
guide,
Fixing/separa-
tion lower
guide,
Separation
guide
ITD cleaning 3
4
5
Fixing assem- 6
bly
High-voltage 7
PCB 2 (ITD
cleaning bias
or fixing/sepa-
ration bias out-
put absent)
COPYRIGHT © 1999 CANON INC.
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Checks
Does the soiling have a specific
interval (as of the diameter of the
cassette pick-up roller, registration
roller, lower fixing roller, feeding
roller 1/2, etc.)?
Is the secondary transfer belt
assembly, fixing assembly inlet
guide, fixing/separation lower guide
or separation guide soiled?
Are there scratches or dirt in the
peripheral direction of the ITD clean-
ing roller?
Is the contact of the ITD cleaning
roller (for ITD cleaning bias) or the
contact for the ITD cleaning mecha-
nism of the printer unit soiled?
Does the problem occur in a high
humidity environment?
Is the contact of the fixing assembly
(for fixing bias) or the contact for the
fixing/separation bias of the printer
unit soiled?
Replace the high-voltage PCB 2. Is
the problem corrected?
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Yes/No Action
YES See Table 10-202.
Identify the soiled
roller, and clean it. If
the dirt cannot be
removed, replace it.
YES Clean the soiled part. If
the dirt cannot be
removed, replace the
part.
YES Replace the ITD clean-
ing roller.
YES Clean the contact. If it
is damaged, replace
the problem part. Also,
check for a displaced
part.
YES Wipe the surface of the
intermediate transfer
drum with a moistened
flannel cloth; then, dry
wipe it with lint-free
paper.
YES Clean the contact. If it
is damaged, replace
the problem part. Also,
check for a displaced
contact.
YES Replace the PCB.
10-19