Canon CP660 Service Manual page 331

4 +24 VAR is absent.
Cause Step
DC power sup- 1
ply (printer
unit)
Connectors 2
Right cover 3
switch (main
relay PCB)
Black toner 4
cartridge
detecting
switch
Toner cartridge 5
cover switch
(SW672)
Drum cartridge 6
switch
(SW642)
Main relay 7
PCB
Note:
The printer unit power switch (SW1) is blocked by a face cover after turning on the
printer unit at time of installing the reader unit. Do not detach the cover unless this step
must be performed. Be sure to turn it on, and attach the face cover after the work.
COPYRIGHT © 1999 CANON INC.
Download free service manual at http://printer1.blogspot.com
Checks
Disconnect the power plug from the
printer unit, and connect it to the
power outlet directly. Is DC power
present in the printer unit?
Are the connector J701 on the
developing rotary motor PCB, con-
nectors J641, J642, J644, and J648
on the main relay PCB, connector
J672 on the sub relay PCB, and
connector J102 of the power supply
connected securely?
Is there electrical continuity between
the connectors J641-1 (+24 VB) and
J642-3 (PMP) on the main relay
PCB when the right cover switch
(SW641) is turned on?
Is there electrical continuity between
the connectors J644-1 (PBK) and
J644-2 (PMP) on the main relay
PCB when the black toner cartridge
detecting switch (SW644) is turned
on?
Is there electrical continuity between
the connectors J642-1 (PYMC) and
J642-2 (PBK) on the sub relay PCB
when the toner cartridge cover
switch (SW762) is turned on?
Is there electrical continuity between
the connectors J642-1 (PYMC) and
J648-1 (+24 VAR) on the main relay
PCB when the drum cartridge switch
(SW642) is turned on?
Disconnect the printer unit power
plug from the reader unit, and con-
nect it to the power outlet directly. Is
the voltage between the connectors
J648-1 (+24 VAR) and J648-3
(GND) on the main relay PCB 24 V
when the printer unit power switch
(Note 1) is turned on?
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Yes/No Action
NO See 4. "DC power is
absent in the printer
unit."
NO Connect the connec-
tors securely.
NO Replace the right cover
switch on the main
relay PCB.
NO Replace the black toner
cartridge detecting
switch (SW644).
NO Replace the toner car-
tridge cover switch
(SW672) on the sub
relay PCB.
NO Replace the drum car-
tridge switch (SW642)
on the main relay PCB.
NO Replace the main relay
PCB.
YES Replace the DC con-
troller PCB.
10-49