The Copy Is Foggy - Canon NP6330 Service Manual

CHAPTER 11 TROUBLESHOOTING
6 The copy is foggy. (entire copy)
Cause Step
1
Scanner 2
Pre-exposure
3
lamp
Developing rolls 4
Developing
5
assembly
Drum unit
6
Lamp
7
regulator
High-voltage
cord, high-
voltage power
supply PCB,
DC controller
PCB, scanning
lamp
11-60
Checks
Perform the Image Adjustment
Basic Procedure. Is the problem
corrected?
Clean the scanning lamp, reflect-
ing plate, side reflecting plate,
mirror, lens, and dust-proofing
glass. Is the problem corrected?
Is the pre-exposure lamp on
during copying operation?
Are the developing rolls worn?
Is the developing cylinder insulat-
ed from the copier GND?
Turn off the power, and disconnect
the connector Dp from the high-
voltage power supply PCB; then,
check the length between the con-
nector on the developing assem-
bly side and the copier GND for
electrical continuity using a meter.
Replace the drum unit. Is the
problem corrected?
Replace the lamp regulator. Is the
problem corrected?
COPYRIGHT © 1997 CANON INC.
YES/NO
YES
YES
NO
YES
NO
YES
YES
NO
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
End.
End.
See "The pre-exposure
lamp fails to turn on."
Replace the developing
rolls.
Check the developing
cylinder and the area
around the developing
connector.
End.
End.
1. Check the high-
voltage cord for
electrical continuity.
2. Check the high-
voltage power supply
PCB and the DC
controller PCB.
3. Replace the scanning
lamp.