Canon CP660 Service Manual page 309

15 The print has dots.
Cause Step
Secondary 1
transfer belt
assembly
Separation sta- 2
tic eliminator
Separation sta- 3
tic eliminator
bias PCB
4
DC controller
PCB
16 The print has a ghost image.
Cause Step
Connector, 1
Wiring
Pre-exposure 2
LED assembly
DC controller
PCB
17 The print is soiled (in double-sided copying mode).
Cause Step
Duplexing unit 1
2
3
COPYRIGHT © 1999 CANON INC.
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Checks
Is the charging roller of the sec-
ondary transfer belt deformed or
worn?
Is the charging wire of the separa-
tion static eliminator broken?
Are the connectors J5600, J5601,
and J5602 on the separation static
eliminating bias PCB connected
securely?
Replace the separation static elimi-
nating bias PCB. Is the problem cor-
rected?
Checks
Are the connector J681 of the pre-
exposure LED assembly, relay con-
nectors J74 and J18, connectors
J645 and J647 on the main relay
PCB, and connector J227 on the DC
controller PCB connected securely?
Replace the pre-exposure LED
assembly. Is the problem corrected?
Checks
Is the duplexing feeding roller 1
soiled?
Is the feeding guide soiled?
Is the reversing roller or the duplex-
ing feeding roller 2 soiled?
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Yes/No Action
YES Replace the secondary
transfer charging roller.
YES Replace the separation
static eliminator.
NO Connect them securely.
YES End.
NO Replace the DC con-
troller CPB.
Yes/No Action
NO Connect them securely.
YES Replace the pre-expo-
sure LED assembly.
NO Replace the DC con-
troller PCB.
Yes/No Action
YES Clean the roller.
YES Clean the guide.
YES Clean the roller.
NO Replace the duplexing
unit.
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