Panasonic UF-490 / UF-4000 / UF-4100 Service Manual ▷ View online
97
4.4.10. Improper Fusing (Printed image does not bond to the paper)
Note:
Replace the entire Fuser Unit when the Thermostat and / or the Thermistor turn into an open-circuit.
END
Is the Fuser Unit normal?
No
Yes
Replace the Fuser Unit. (See Note)
START
No
Yes
Is the recording paper damp?
Replace the recording paper.
P
98
4.4.11. Voids in Solid Areas
END
No
Yes
Clean or replace the rollers.
START
No
Yes
Is the recording paper damp?
Replace the recording paper.
Is the Toner Cartridge/
Drum Unit Assembly
operational?
Drum Unit Assembly
operational?
Yes
No
Replace the Toner Cartridge/
Drum Unit Assembly.
Drum Unit Assembly.
P
Paper Travel
Are the Fuser and Pressure
Roller surfaces clean?
Roller surfaces clean?
99
4.4.12. Black Dots
END
No
Yes
Clean or replace the rollers.
START
Is the Toner Cartridge/
Drum Unit Assembly
operational?
Drum Unit Assembly
operational?
Yes
No
Replace the Toner Cartridge/
Drum Unit Assembly.
Drum Unit Assembly.
P
Paper Travel
Are the Fuser and Pressure
Roller surfaces clean?
Roller surfaces clean?
100
4.4.13. Recording Paper Creases
START
No
Yes
Is the recording paper damp?
Replace the recording paper.
END
Are the Fuser and Pressure
Roller surfaces clean or are
there any foreign particles or
stains in the Fuser Unit?
Roller surfaces clean or are
there any foreign particles or
stains in the Fuser Unit?
2. Clean or replace the rollers.
1. Remove any foreign particles
and / or clean the stains.
and / or clean the stains.
Are there any foreign particles
or stains in the paper path?
or stains in the paper path?
Yes
No
Remove any obstructions and / or
clean the paper path.
clean the paper path.
No
Yes
Is the recording paper skewing?
Ensure the paper is set correctly in
the Paper Tray and that the Paper
Guides are properly adjusted.
the Paper Tray and that the Paper
Guides are properly adjusted.
No
Yes
3. Replace the Fuser Unit.
Paper Travel
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