Panasonic UF-490 Service Manual page 97

4.4.10. Improper Fusing (Printed image does not bond to the paper)
P
START
Yes
Is the recording paper damp?
No
Replace the recording paper.
No
Is the Fuser Unit normal?
Yes
Replace the Fuser Unit. (See Note)
END
Note:
Replace the entire Fuser Unit when the Thermostat and / or the Thermistor turn into an open-circuit.
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