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CHAPTER 6 TROUBLESHOOTING
6-36
I-16 Black spots
Possible cause Step Check Result Remedy
Drum unit 1 Are the spots at 94mm
intervals?
(The problem is not solved
after printing a few pages.)
Yes 1) If toner or glue remains
stuck, wipe it off gently with a
cotton swab. (Refer to NOTE
in the previous page.)
2) If the photosensitive drum is
scratched or deteriorated
(exposed), replace the drum
unit.
Fixing unit 2 Are the spots at 79mm
intervals?
(The problem is not solved
after printing a few pages.)
Yes 1) Check and clean the heat
roller with a cloth dampened
with alcohol.
2) Replace the fixing unit.
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.
I-17 Black band
Possible cause Step Check Result Remedy
Ground
contacts
Corona failure 1 Is the wire cleaner at its home
position?
No Return the wire
cleaner to its home
position.
➁
Corona failure 2 Is the corona wire dirty? Yes 1) Clean the corona
wire.
2) If the problem still
appears after
cleaning, replace
the drum unit.
➁
User Check
(1) If the problem is not solved after printing a few pages, the drum unit may have
glue from label stock on the photosensitive drum surface. Refer to Step 1 in the
table below and NOTE in the previous page.
(2) The drum unit may be damaged. Install a new drum unit.