The Copy Is Blank - Canon NP6330 Service Manual

21

The copy is blank.

Step
Cause
1
Drum unit
2
Drum drive
assembly
3
Primary charg-
ing assembly
4
5
6
Blank exposure
assembly
7
Developing
assembly
8
9
Developing
assembly drive
assembly
10
Transfer charg-
ing assembly
11
12
High-voltage
cord
High-voltage
power supply
PCB
COPYRIGHT © 1997 CANON INC.
Checks
Is the drum unit set?
Is the photosensitive drum rotating
during copying operation?
Is the primary charging assembly
set properly?
Is the charging wire broken?
Is the grid installed properly?
Does the blank shutter solenoid
operate during copying operation?
Is the developing assembly set?
Is there toner over the toner sen-
sor of the developing assembly?
Is the developing cylinder rotating
during copying?
Is the transfer charging assembly
set securely?
Is the charging wire broken?
Is there electrical continuity
between connectors of the high-
voltage cord connected to the
developing assembly and each
charging assembly?
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO Action
NO Set the drum unit.
NO 1. Check to see if the
photosensitive drum
is rotating smoothly.
2. Check the drum drive
assembly.
NO Set it properly.
YES Re-route the charging
wire.
YES Install it properly.
NO Check the blank
exposure assembly.
(Replace the solenoid.)
NO Set the developing
assembly.
NO See "The Add Toner
indicator fails to turn off."
NO Check the developing
assembly drive
assembly.
NO Set the charging
assembly securely.
YES Replace the charging
wire.
NO Replace the high-voltage
cord.
YES Replace the high-voltage
power supply PCB.
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