Fig. 6-6; How to clean the pressure roller- Page 150

CHAPTER 6  TROUBLESHOOTING

6-28

I-5

Dirt on the back of paper

Possible cause

Step

Check

Result

Remedy

Fixing unit dirty

1

Is the pressure roller dirty?

Is any other area in the printer
dirty?

Yes

Clean the pressure roller
referring to 

the following

procedure

.

Dirt in the drum
unit

2

Is the transfer roller dirty?

Is the problem solved after
replacing the drum unit?

Yes

Replace the drum unit

No

Replace the high-voltage power
supply PCB.

NOTE:

• 

This problem may disappear after printing approximately 10 pages of completely blank
sheets.

• 

The dirt on the back of paper as shown at the right is
caused by toner on the star wheel hooks in the fixing
unit.  This problem may disappear after printing a few
pages.

Fig. 6-6

How to clean the pressure roller

Clean the pressure roller as follows;

(1)  Set three or more sheets of paper in the paper cassette.

(2)  Open the front cover, and turn on the power switch while holding down the control panel

button.

(3)  Release the panel button when the Drum LED is on.

(4)  Close the front cover.

(5)  Hold down the panel button until the Ready LED is on, then release the button.  Three

patterns; grid, zip and solid black are printed.

(6)  Turn off the power switch with the front cover closed.

(7)  Set paper in the manual feed slot with the solid black side down.

(8)  Turn on the power switch while holding down the control panel button.

(9)  Release the panel button when the Drum LED is on.

(10) Press the panel button again and release it immediately.  A page of test pattern is printed

while cleaning the pressure roller.