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I-21
Horizontal lines
Possible cause
Step
Check
Result
Remedy
Paper tray
contacts
1 Are the ground contacts on
the right side of the paper
tray connecting correctly?
No Clean the contacts.
Drum unit 2 Are the high-voltage power
supply and drum unit
contacted correctly?
No Clean the contacts.
I-22
Light rain
Possible cause
Step
Check
Result
Remedy
Ground
contacts
Drum unit
failure
1 Is the problem solved after
replacing the drum unit?
Yes Replace the drum unit.
Drum
connection
failure
2 Is the contact between the
drum unit and printer body
connected correctly?
No Clean contact electrode
both on the drum unit
and in the printer body.
(7)
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.