The Copy Is Foggy. (Overall) - Canon NP6045 Service Manual

6. The copy is foggy. (overall)

Cause Step
LIGHT_5
Scanner
Cleaning
assembly
Pre-exposure
lamp, DC
controller PC
Developing roll
Developing
cylinder
Lamp regulator
Potential control
system
DC controller
PCB.
High-voltage
transformer,
Developing
assembly
COPYRIGHT © 1997 CANON INC.
Checks
1 Perform the Image Adjustment
Basic Procedure. Is the problem
corrected?
2 Clean the scanning lamp,
reflecting plate, side reflecting
plate, mirror, lens, dust-proofing
glass, and heat-absorbing glass.
Is the problem corrected?
3 Is the cleaning blade installed
properly?
4 Is the pre-exposure lamp ON
during copying?
5 Is the developing roll worn?
6 Is the developing cylinder worn?
7 Replace the lamp regulator. Is the
problem corrected?
8 Make checks on p. 10-35. Is the
potential sensor normal?
9 Set the meter range to 30 VDC. Is
the voltage between J114A-2
(DCBC) and J114A-13 (GND) on
the DC controller PCB during
copying between 2 and 11 V?
CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
YES/NO Action
YES End.
YES End.
NO Install the cleaning blade
correctly.
NO 1. Replace the pre-
exposure lamp.
2. Replace the DC
controller PCB.
YES Replace the developing
roll.
YES Replace the developing
cylinder.
YES End.
YES Replace the DC
controller PCB.
NO Replace the DC
controller PCB.
YES 1. Check the wiring from
the DC controller PCB
to the high-voltage
transformer; if normal,
replace the high-
voltage transformer.
2. Check the developing
assembly.
10-63