The Copy Is Foggy (Entire Face) - Canon iR2200 Service Handbook

3.6 The copy is foggy (entire face).

Scanner
1) Clean the scanning lamp, reflecting plate, mirrors, and lenses. Is the
problem corrected?
YES: End.
2) Perform the Image Adjustment Basic Procedure. Is the problem cor-
rected?
YES: End.
3) Select the following in service mode, and press the OK key:
COPIER>FUNCTION>DPC>D-GAMAM. Is the problem corrected?
NO:
Developing assembly
4) Is the developing cylinder insulated from the GND of the machine?
(Turn off the main power switch, and disconnect the connector J130 of the
composite power supply PCB; then, check the length between J130-1 and
the metal plate of the host machine for electrical continuity.)
NO:
High-voltage system
5) Is PG solid white foggy?
YES: Check the high-voltage system.
Service mode
6) Adjust the setting of the following up to +30 of the factory value:
ADJUST>DEVELOP>DE-OFST. Is the problem corrected?
YES: End.
Developing bias, DC controller PCB
7) Try replacing the composite power supply. Is the problem corrected?
YES: End.
NO:
CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Replace the drum unit. However, be sure to take appropriate mea-
sures, as a fault in the following is suspected: main controller PCB,
DC controller PCB, composite power supply PCB.
Check the area around the developing cylinder and the develop-
ment connectors.
Replace the DC controller PCB.
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