Service manual

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
13-24
12 Thin White Lines (vertical)
11 White Strips (vertical)
Cause
Exposure sys-
tem
Transfer charg-
ing roller
Separation sta-
tic charge elim-
inator
Cartridge
Fixing
Assembly
Steps
1
2
3
4
Yes/No
YES
YES
YES
YES
NO
Action
Clean the white refer-
ence plate, on the back
of the copyboard glass,
and mirrors 1-4.
Clean the roller. If
cleaning does not solve
the problem, replace
the roller.
Clean the separation
static charge eliminator.
End
Replace the fixing
assembly.
Checks
Make a test print following the direc-
tions on page 13-120. Is the output
image normal?
Is there dirt on the transfer charging
roller?
Is there dirt on the separation static
charge eliminator?
Is the trouble resolved when the car-
tridge is replaced?
13 Leading Edge Displacement
Cause
Document
Paper curl
Paper overload
Pick-up roller
Feed roller
Separation
roller
Registration
roller
Faulty adjust-
ment of leading
edge margin
DC controller
PCB
Steps
1
2
3
4
5
6
Yes/No
NO
YES
YES
NO
NO
YES
NO
Action
Reset the document.
Replace the paper.
Explain to the user that
each cassette can hold
a maximum of 250
sheets of paper.
Check each roller. If
any are worn, replace
them.
If the registration roller
is dirty, clean it. If it is
worn, replace it.
End
Replace the DC con-
troller PCB.
Checks
Is the document set properly?
Is the paper very curled?
Is the amount of paper set in the
cassette over the limit?
Are the rollers of the pick-up level on
which the displacement occurs nor-
mal?
Is the registration roller normal?
Is the trouble resolved when the
leading margin adjustment proce-
dures described on page 13-3 are
performed?
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