The Output Is Foggy (Overall) - Canon iR105 Service Manual

3.3.6 The output is foggy (overall)

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1) Perform the Image Adjustment Basic Procedure. Is the problem
YES: End.
Scanner (dirt)
2) Does the problem occur only in copy images?
YES: The cause is between scanner and CCD. Perform the following:
High-voltage DC PCB (settings)
3) Is the switch SW101 on the high-voltage PCB set to UP position?
NO:
Potential control system
4) Set the following in service mode '0' to turn off potential control:
YES: The cause is in the potential control system. Make checks as in-
Cleaner assembly
5) Is the cleaning blade mounted correctly?
NO:
Pre-exposure lamp, DC controller PCB
6) Does the pre-exposure lamp remain ON during copying?
NO:
Developing roll, Developing cylinder
7) Is the developing roll worn?
YES: Replace the developing roll.
NO:
Developing bias (control)
8) Is the setting of the following in service mode high:
YES: Try decreasing the setting.
Developing cylinder speed control
9) Is the setting of the following in service mode '2':
NO:
COPYRIGHT© 2001 CANON INC.
corrected?
[1] Check the scanning lamp for dirt and the end of its life.
[2] Check the reflecting plate, mirrors, lenses, and standard white
plate for dirt.
Set it to UP position.
COPIER>OPTION>BODY>PO-CNT. Is the problem corrected?
structed for checking the surface potential control system (2.7.12).
Mount the cleaning blade correctly.
[1] Replace the pre-exposure lamp.
[2] Replace the DC controller PCB.
Replace the developing cylinder.
COPIER>ADJUST>V-CONT>DE-OFT, OHP-OFST?
COPIER>OPTION>BODY>DEVL-SLOW?
Set it to '2'.
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CHAPTER 6 TROUBLESHOOTING
CANON iR105 REV.0 JULY 2001
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