3-30 Phaser 4500/4510 Service Manual
Error Messages and Codes
Fuser Failure
Diagnostic Error Codes
U4-1: Fuser High Temp
U4-2: Fuser Low Temp
U4-3: Fuser overheat in stand-by
U4-4: Fuser fails at warm-up
U4-5: Fuser thermistor failure
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
■ Fuser assembly
■ HVPS/engine logic board
■ LVPS
■ Fuser assembly harness
■ LVPS harness assembly
■ “Fuser Assembly, Power Switch” on page 10-25
■ “Print Engine Wiring Diagrams” on page 10-19
■ “Print Engine Plug/Jack Locator” on page 10-3
Troubleshooting Procedure
Steps Actions and Questions Yes No
1 Turn the printer ON and notice how
much time elapses before the error
occurs.
Does the error occur soon after the
power is turned ON?
Replace the
fuser assembly.
(page 8-44)
Go to “Fuser
Assembly” on
page 4-15.
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