Canon IR2800, IR3300, IR2200 manual Copy is too light entire face, considerable, 10 T

CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

3.3The 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: Go to step 5.

Developing assembly

3) Are the developing members in firm contract with the drum?

NO: Check the developing assembly locking lever. Check the surface of the developing members for foreign matter (toner).

Developing clutch

4) Is the developing cylinder rotating?

NO: Check the developing clutch (for a lose hex screw).

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:

•Check the transfer charging roller pressure spring.

•Check the feeding locking assembly.

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:

•Replace the high-voltage cord.

•Check the feeding unit.

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 PCB.

4-10 T COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001