Brother HL-5340D Service Manual page 103

Black spots
<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
- The drum unit may be damaged. Replace the drum unit with a new
one.
Step Cause
Toner attached
on the develop
1 roller
Scratch and Dirt
on the exposure
2
drum
Drum unit
3 connection
failure
Scratch and Dirt
on the heat roller
4
HVPS PCB
5 failure
Main PCB failure Is the problem solved
6
Black band
<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.
previous page, and wipe it off gently with a cotton swab.
Check
Are the horizontal
stripes at 42.5 mm
(develop roller
circumference)
intervals?
Are the horizontal stripes
at 94.2 mm (exposure
drum circumference)
intervals?
Are the electrodes on
the drum unit and
machine body dirty?
Are the horizontal
stripes at 78.5 mm (heat
roller circumference)
intervals?
Is the problem solved
after replacing the
HVPS PCB ASSY?
after replacing the main
PCB ASSY?
3-45
Result Remedy
This problem will
disappear by printing
Yes approximate 10 pages. If
the same problem occurs,
replace the toner cartridge.
Replace the drum unit.
Yes
Clean both electrodes
Yes (Refer to Fig. 3-2, Fig.
Replace the fuser unit.
Yes
Replace the HVPS PCB
Yes ASSY.
Replace the main PCB
Yes ASSY.
3-3.)
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