Canon CP660 Service Manual page 298

CHAPTER 10 TROUBLESHOOTING
Cause Step
Contact (for 7
color develop-
ing bias)
High-voltage 8
PCB 1 (inade-
quate color
developing bias
output)
9
Intermediate 10
transfer drum
High-voltage 11
PCB 1 (inade-
quate primary
transfer bias
output)
Secondary 12
transfer belt
assembly
High-voltage 13
PCB 2
10-16
COPYRIGHT © 1999 CANON INC.
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Checks
Is the contact for the color develop-
ing bias for the printer unit soiled?
Open the front cover while toner is
being developed on the photosensi-
tive drum (about 20 sec after the
start of test printing), and take out
the black toner cartridge. Then, take
out the drum cartridge, and check
the toner image on the surface of
the photosensitive drum. Is the color
toner image fully developed on the
surface of the photosensitive drum?
Open the right cover of the printer
unit, and fit the door switch actuator.
Make a print, and check the toner
image on the surface of the interme-
diate transfer drum. Is the toner
image fully developed on the sur-
face of the intermediate transfer
drum?
Is the contact of the intermediate
transfer drum unit (for primary trans-
fer bias) or the contact of the prima-
ry transfer bias for the printer unit
soiled?
Replace the high-voltage PCB 1. Is
the problem corrected?
Is the contact of the secondary
transfer belt assembly (for sec-
ondary transfer bias) or the contact
of the secondary transfer bias for
the printer unit soiled?
Replace the high-voltage PCB 2. Is
the problem corrected?
Yes/No
YES
NO
YES
NO
YES
YES
YES
NO
YES
YES
NO
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Clean the contact. If it
is deformed or dam-
aged, replace the prob-
lem part. Also, check
for a displaced contact.
Replace the high-volt-
age PCB 1.
Replace the DC con-
troller PCB.
Go to step 10.
Go to step 12.
Clean the contact. If it
is deformed or dam-
aged, replace the prob-
lem part. Also, check
for a displaced contact.
End.
Go to step 12.
Clean the contact. If it
is deformed or dam-
aged, replace the prob-
lem part. also, check
for a displaced contact.
End.
Replace the DC con-
troller PCB.