The Copy Is Too Light (Entire Face, Considerable) - Canon iR2200 Service Handbook

CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

3.3 The copy is too light (entire face, considerable).

1) Perform the Image adjustment Basic Procedure. Is the problem cor-
rected?
Check to make user that the placement of the pattern print when executing
the folding is correct: FUNCTION>DENS>PD-ME.
YES: End.
AE adjustment
2) Turn off the main power switch in the middle of copying operation, and
open the front cover. At this time, is the toner image on the surface of the
photosensitive drum before transfer more or less normal?
NO:
Developing assembly
3) Are the developing members in firm contract with the drum?
NO:
Developing clutch
4) Is the developing cylinder rotating?
NO:
Feeding unit (tranfer charging roller)
5) Is the feeding unit locked in place correctly?
Is the transfer roller in contact with the photosensitive drum whet the feed-
ing unit is locked in place?
NO:
•
•
6) Is there leakage in the electrode assembly of the feeding unit?
YES: Check the electrode assembly of the feeding unit.
High-voltage cord, Feeding unit (Transfer charging roller)
7) Is the feed electric continuity from the composite power supply PCB to
the electrode assembly of the feeding unit? (The resistance of the high-volt-
age cord of the transfer charging roller is about 10 kΩ.)
NO:
•
•
Composite power supply PCB, DC controller PCB
8) Is there electrical continuity from the composite power supply PCB to
the feeding unit? (The resistance of the high-voltage cord of the transfer
charging roller is about 10 kΩ.)
YES: Check the composite power supply PCB and the DC controller
4-10
Go to step 5.
Check the developing assembly locking lever. Check the surface of
the developing members for foreign matter (toner).
Check the developing clutch (for a lose hex screw).
Check the transfer charging roller pressure spring.
Check the feeding locking assembly.
Replace the high-voltage cord.
Check the feeding unit.
PCB.