Service manual

1-32
Confidential
■ Black spots
■ Black band
User Check
• Damp (wet) paper might be used. Try to change to freshly unpacked
paper.
• Toner may be empty. Replace the toner cartridge with a new one.
• If the problem is not solved after printing a few pages, the drum unit
may have glue from label stock on the exposure drum surface.
Refer to the previous page, and wipe it off gently with a cotton swab.
• The drum unit may be damaged. Replace the drum unit with a new
one.
Step Cause Check
Result Remedy
1
Toner attached
on the develop
roller
Are the horizontal
stripes at 41.0 mm
(develop roller
circumference)
intervals?
Ye s
This problem will
disappear by printing
approximate 10 pages. If
the same problem occurs,
replace the toner cartridge.
2
Scratch and Dirt
on the exposure
drum
Are the horizontal stripes
at 75.0 mm (exposure
drum circumference)
intervals?
Ye s
Replace the drum unit.
3
Drum unit
connection
failure
Are the electrodes on
the drum unit and
machine body dirty?
Ye s
Clean both electrodes
(Refer to Fig. 1-1, Fig. 1-2.)
4
Scratch and Dirt
on the heat roller
Are the horizontal
stripes at 78.5 mm (heat
roller circumference)
intervals?
Ye s
Replace the fuser unit.
5
HVPS PCB
failure
Is the problem solved
after replacing the
HVPS PCB ASSY?
Ye s
Replace the HVPS PCB
ASSY.
6
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.
User Check
• Clean the inside of the machine and the corona wire in the drum
unit. If the same problem occurs after cleaning, replace the drum
unit with a new one.
• The paper tray ground terminal provided in the machine body may
be dirty. Clean the contact with a dry cloth.