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CHAPTER 6 TROUBLESHOOTING
6-38
I-20 Downward fogging of solid black
Possible cause Step Check Result Remedy
Toner cartridge
failure
1 Is the problem solved after
replacing the toner cartridge?
Yes Replace the toner cartridge.
High-voltage
power supply
PCB failure
2 Is the problem solved after
replacing the high-voltage
power supply PCB?
Yes Replace the high-voltage power
supply PCB.
I-21 Horizontal lines
Possible cause Step Check Result Remedy
Ground
contacts
Paper feed roller 1 Are the feed roller shaft and
the ground contact connected
correctly?
No Check the connection
between the shaft and
the ground contact.
Also check the ground
contact on the back of
the feed roller. Refer
to P.4-28.
Paper cassette
contacts
2 Are the ground contacts on the
back side of the paper cassette
connecting correctly?
No Clean the contacts.
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