Canon CP660 Service Manual page 315

7 E019
Cause Step
Waste toner 1
detection win-
dow
Connectors 2
Waste toner 3
detecting block
(light-emitting/
-receiving sec-
tion; printer
unit)
Waste toner 4
detection block
(printer unit)
8 E020
Cause Step
Density sensor 1
(light-emitting/
-receiving sec-
tion)
Connector 2
(density detec-
tion PCB)
Density detec- 3
tion PCB
COPYRIGHT © 1999 CANON INC.
Download free service manual at http://printer1.blogspot.com
Checks
Is the waste toner detection window
of the photosensitive drum soiled?
Are the connector J21 on the DC
controller PCB, connectors J631
and J633 of the waste toner sensor,
and the relay connector J71 con-
nected securely?
Is the light-emitting/-receiving sec-
tion of the waste toner detection
block of the printer unit soiled?
Replace the waste toner detection
block of the printer unit. Is the prob-
lem corrected?
Checks
Is the density sensor soiled?
Are the connector J1101 on the
density detection PCB, relay con-
nectors J75 and J46, and connector
J206 on the DC controller PCB con-
nected securely?
Is the voltage between the connec-
tors J206-5 (+24 UH) on the density
detection PCB and GND 24 V when
the printer unit is turned on?
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Yes/No Action
YES Wipe the waste toner
detection window with
a dry cloth.
NO Connect the connec-
tors securely.
YES Dry wipe the light-emit-
ting/-receiving section
of the waste toner
detection block with a
dry cloth.
YES End.
NO Replace the photosen-
sitive drum unit. If the
problem cannot be cor-
rected, replace the DC
controller PCB.
Yes/No Action
YES Clean the density sen-
sor with the special
brush.
NO Connect the connec-
tors securely.
NO Replace the density
detection PCB.
YES Replace the DC con-
troller PCB.
10-33