Filter
Top Products
COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
10–41
21.The copy is blank.
Drum unit
Developing
assembly
Primary charging
assembly
Developing
assembly
DC controller PCB
Scanning lamp
(LA1)
Connector
High-voltage cord
High-voltage power
supply (primary/
transfer)
1
2
3
4
5
6
7
8
Is the drum unit set securely?
Is the developing assembly set
securely?
Is the primary charging wire broken?
Is the developing assembly locked to
the drum?
Does the blank exposure lamp remain
off while the scanner is moving
forward?
Does the scanning lamp remain on
during copying operation?
Are the connectors on each PCB
connected securely?
Is there continuity between high-
voltage cords connected to each
charging assembly?
Remove and set the drum unit once
again.
Remove and set the developing
assembly securely.
Spring the charging wire.
Check the developing assembly
locking lever.
Check the DC controller PCB.
Make checks as instructed under “The
scanning lamp fails to turn on.”
Connect the connectors securely.
Replace the high-voltage cord.
Check the high-voltage power supply
(primary/transfer).
Yes/No
Actions
Checks
Cause
NO
NO
YES
NO
NO
NO
NO
NO
YES
Step
22.The copy is solid black.
Does the scanning lamp remain on
during copying operation?
Make checks according to the
instructions under “The scanning
lamp fails to turns off.”
Yes/No
Actions
ChecksStep
Cause
NO
1