User Check- Page 152

CHAPTER 6  TROUBLESHOOTING

6-30

I-7

Black and blurred horizontal stripes

Possible cause

Step

Check

Result

Remedy

Ground

contacts

Scratch on the
drum

1

Are the horizontal stripes at
94mm (photosensitive drum)
intervals?

Yes

The photosensitive
drum was scratched.
Replace the drum
unit.

Toner stuck on
the developer
roller

2

Are the horizontal stripes at
39mm (developer roller)
intervals?

Yes

After printing several
pages, the problem
will disappear.
If not, replace the
toner cartridge.

Scratch on the
heat roller

3

Are the horizontal stripes at
79mm (heat roller) intervals?

Yes

Replace the heat
roller.

Corona contact
failure

4

Are the charge electrodes
between the printer body and
the drum unit dirty?

Yes

Clean both electrodes.

➂

High-voltage
power supply
PCB failure

5

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

Yes

Replace the high-
voltage power supply
PCB.

I-8

Black vertical streaks (in a gray background)

Possible cause

Step

Check

Result

Remedy

Ground

contacts

Translucent
stain on the
scanner window

1

Is there any dirt on the scanner
window?

Yes

1) Clean the scanner

window.

2) If it is not effective,

replace the laser
unit.

Corona failure

2

Is the corona wire dirty?

Yes

Clean the corona wire
with the wire cleaner.

➁

User Check

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

(2) Check the paper used meets the recommended paper specifications.

(3) Clean the printer interior and the corona wire in the drum unit.