Panasonic UF-490 Service Manual page 83

4.4.3. Vertical White Lines
Is the printout in Service
Mode 3 normal?
Is the recording paper damp?
Is the Toner Cartridge/
Drum Unit Assembly
operational?
Are there any foreign particles
or stains blocking the Laser
Beam path?
Are there any foreign particles
or stains on the BTR?
Are the Fuser and Pressure
Roller surfaces clean?
START
Yes
No
Yes
No
No
Yes
Yes
No
Yes
No
No
Yes
END
P
Check the Scanner mechanism.
Replace the recording paper.
Replace the Toner Cartridge/
Drum Unit Assembly.
1. Remove the particles from
the laser beam path or clean the stains.
2. Replace the Laser Unit (LSU).
1. Clean the BTR with a soft, dry cloth.
2. Replace the BTR.
Clean or replace the rollers.
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