4. Troubleshooting
3)
Horizontal Black Band
Description : Dark of blurry horizontal stripes occur in the printing periodically.
Probable Cause
Solution
The paper is dirty or not the proper type.
Replace the paper.
The paper path is contaminated by toner residue, debris etc.
Clean the paper path.
The contact terminal of the imaging unit is bad.
1) Clean the contact terminal of the imaging unit.
2) Replace the imaging unit.
The surface of transfer roller is contaminated or worn out.
Replace the transfer roller.
The LSU window is contaminated.
1) Clean the LSU window.
The pressure roller or heat roller in fuser unit defective.
1) Turn the machine off.
2) Remove and replace the fuser unit.
3) Turn the machine on.
WARNING
Do not touch the fuser unit while it is hot.
HVPS terminal is contaminated.
Clean the contaminated terminal.
The output from the HVPS is abnormal.
Replace the HVPS board.
NOTE
Roller Period for Horizontal Problem
Roller Description
Band Period (mm)
Defective part
Pressure Roller
75.4 mm
Heat roller
77.6 mm
Fuser Unit
Charge roller
26.7 mm
OPC drum
75.49 mm
Imaging Unit
Supply roller
63.22 mm
Toner Cartridge
Transfer roller
47.12 mm
Transfer Roller
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