3-28 Phaser 4500/4510 Service Manual
Error Messages and Codes
Main Motor Failure
Diagnostic Error Code
U1: Main Drive Motor Failure
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
■ Main motor
■ Gear assembly housing
■ Plate gear assembly
■ LVPS
■ HVPS/engine logic board
■ “P4500: 24 V Interlock, Rear Cover Switch,
Main Motor, Sub Fan, Exit Motor Assembly” on
page 10-21
■ “Laser Unit, 5 V Interlock, Interlock Switch
Assembly” on page 10-29
■ “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 1.Remove the left cover (page 8-8).
2.Enter Service Diagnostics and check
main motor operation.
Does the main motor rotate, and
each gear rotate normally?
Replace the
HVPS/engine
logic board.
(page 8-73)
Go to step 2.
2 Rotate and check each gear of the gear
assembly housing and plate gear
assembly.
Does each gear rotate normally?
Go to “Main
Motor”
(page 4-11).
Replace the
parts causing
the obstruction.
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