Xerox Phaser 7400

Error Messages and Codes 3-165
Failure in the [C][M][Y][K] Imaging Unit Drum or Motor
The Drum Phase Sensor integrated on the Imaging Unit Sensor Board indicates an
error in one of the Imaging Units.
Applicable Status Codes:
Code 920: The Yellow Imaging Unit drum is not rotating.
Code 921: The Magenta Imaging Unit drum is not rotating.
Code 922: The Cyan Imaging Unit drum is not rotating.
Code 923: The Black Imaging Unit drum is not rotating.
Initial Actions:
■ Reseat the affected Imaging Unit
■ Cycle the printer's power.
■ If the problem persists follow the procedure below.
5
Check the LVPS +24 V output.
1. Close the Interlock Switches.
2. Disconnect CN2.
Is there +24 V at CN2-1 and <=> ground?
Go to Step 6. Replace the LVPS
(
page 8-121).
6
Check all pins of the DRV1 harness for
continuity.
Disconnect the DRV1 ribbon cable.
Is the cable conductive?
Replace the Engine
Control Board
(
page 8-112).
Replace the DRV1
Harness.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Imaging Unit Motors, PL2.1.8
■ Imaging Unit Sensor Board, PL5.1.20
■ LVPS, PL3.1.1
■ Motor Driver Board, PL2.1.10
■ Print Engine Map 5 (page 10-8)
■ Print Engine Map 6 (page 10-9)
■ Print Engine Map 8 (page 10-11)
■ Print Engine Motor Driver Board (3/6) (page 10-33)
■ Print Engine Imaging Unit Sensor Board (page 10-41)
Troubleshooting Procedure Table (Continued)
Step Actions and Questions Yes No