Panasonic UF-890 Service Manual page 138

4.4.7 Dark Background
Is the printout in Service Mode 3
normal?
Is the recording paper damp?
Is the Toner Cartridge operational?
Is the LSU normal?
Is the HVPS normal?
Are the Fuser and Pressure Roller
surfaces clean?
START
Yes
No
Yes
No
No
Yes
No
Yes
No
Yes
No
Yes
END
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Check the Scanner mechanism.
Replace the paper.
Replace the Toner Cartridge.
Replace the LSU.
1. Check all connectors and
voltages on the HVPS.
2. Check the Spring Connector
and voltage on the HVPS.
3. Replace the HVPS.
Clean or replace the rollers.