User Check- Page 148

CHAPTER 6  TROUBLESHOOTING

6-26

I-3

Completely blank

Possible cause

Step

Check

Result

Remedy

Ground

contacts

Developing bias
contact failure

1

Are the developing bias
contacts between the printer
body and drum unit dirty?

Yes

Clean the electrodes
at both sides.

➃

Drum unit

2

Are the drum shaft and drum
electrode of the printer body
connected correctly?

Yes

Clean the shaft and
the electrode.

➀

No

Check the connection
between the shaft and
the electrode.

➀

Drum unit failure

3

Is the problem solved after
replacing the drum unit?

Yes

Replace the drum
unit.

Toner cartridge
failure

4

Is the problem solved after
replacing the toner cartridge?

Yes

Replace the toner
cartridge with a new
one.

Scanner
harness
connection
failure

5

Is the scanner harness
connected securely?
(Check if there is any play in
the connection.)

No

Reconnect the
connector correctly.

Main PCB failure

6

Are printing signals being input
to the laser unit?

Is the problem solved after
replacing the main PCB?

Yes

Replace the main
PCB.

Laser unit failure

7

Is the scanner interlock lever
damaged?

Yes

Replace the laser unit.

Is the scanner mirror broken or
loose?

No

Replace the high-
voltage power supply
PCB.