3-28 Phaser 4500 Service Manual
Fuser Failure
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 10-20
■ “Print Engine General Wiring Diagram” on
page 10-17
■ “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 8-54)
Go to “Fuser
Assembly” on
page 4-16.
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