User Check- Page 158

CHAPTER 6  TROUBLESHOOTING

6-36

I-16

Black spots

Possible cause

Step

Check

Result

Remedy

Drum unit

1

Are the spots at 94mm
intervals?
(The problem is not solved
after printing a few pages.)

Yes

1)  If toner or glue remains

stuck, wipe it off gently with a
cotton swab.  (Refer to 

NOTE

in the previous page.)

2)  If the photosensitive drum is

scratched or deteriorated
(exposed), replace the drum
unit.

Fixing unit

2

Are the spots at 79mm
intervals?
(The problem is not solved
after printing a few pages.)

Yes

1)  Check and clean the heat

roller with a cloth dampened
with alcohol.

2)  Replace the fixing unit.

High-voltage
power supply
PCB failure

3

Is the problem solved after
replacing the high-voltage
power supply PCB?

Yes

Replace the high-voltage power
supply PCB.

I-17

Black band

Possible cause

Step

Check

Result

Remedy

Ground

contacts

Corona failure

1

Is the wire cleaner at its home
position?

No

Return the wire
cleaner to its home
position.

➁

Corona failure

2

Is the corona wire dirty?

Yes

1)  Clean the corona

wire.

2)  If the problem still

appears after
cleaning, replace
the drum unit.

➁

User Check

(1) If the problem is not solved after printing a few pages, the drum unit may have

glue from label stock on the photosensitive drum surface.  Refer to Step 1 in the
table below and 

NOTE 

in the previous page.

(2) The drum unit may be damaged.  Install a new drum unit.