Canon CP660 Service Manual page 330

CHAPTER 10 TROUBLESHOOTING
3 +24 UH is absent.
Cause Step
DC power 1
(printer unit)
Connectors 2
Right cover 3
switch (man
relay PCB)
Delivery 4
cover/front
cover switch
(sub relay
PCB)
Power supply 5
(printer unit)
Main relay 6
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.
10-48
COPYRIGHT © 1999 CANON INC.
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Checks
Disconnect the printer unit power
plug from the reader unit connector,
and connect it to the power plug
directly. Is DC power present in the
printer unit?
Are the connectors J641 through
J643 and J6476 of the main relay
PCB, connectors J671 and J673 on
the sub relay PCB, connector J102
of the power supply, and connector
J227 on the DC controller PCB con-
nected 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 J671-1 (PMP) and
J671-2 (PFUFR) on the sub relay
PCB when the delivery cover/front
cover switch (SW761) is turned on?
Disconnect the printer unit power
plug from the reader unit, and con-
nect it to the power outlet directly.
Turn on the printer unit power switch
(Note 1), and measure the voltage
between the connectors J641 (+24
VB) on the main relay PCB and
J641-4 (GND). Is it 24 V?
Disconnect the printer unit power
plug from the reader unit, and con-
nect it to the power outlet directly.
Turn on the printer unit power switch
(Note 1), and measure the voltage
between the connectors J647-B11
(+24 UH) on the main relay PCB
and J647-A1(GND). Is it 24 V?
Yes/No
NO
NO
NO
NO
NO
NO
YES
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
4. "DC power is absent
in the printer unit."
Connect the connec-
tors securely.
Replace the right cover
switch on the main
relay PCB.
Replace the delivery
cover/front cover switch
on the sub relay PCB.
Replace the printer unit
power supply.
Replace the main relay
PCB.
Replace the DC con-
troller PCB.