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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. (4)
Yes Clean the shaft and the
electrode.
(1)
Drum unit 2 Are the drum shaft and
drum electrode of the
printer body connected
correctly?
No Check the connection
between the shaft and
the electrode.
(1)
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.
Yes Replace the laser unit. Laser unit
failure
7 Is the scanner interlock
lever damaged?
No Replace the high-
voltage power supply
PCB.
Laser scanner unit assy
Interlock lever