Xerox Phaser 7400

Error Messages and Codes 3-65
Install or Reseat [C][M][Y][K] Imaging Unit
The Imaging Unit CRUM fails to detect the Imaging Unit.
Initial Actions:
■ Remove and reseat the Imaging Unit.
■ Cycle printer power.
■ If the problem persists, follow the procedure below
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Imaging Unit, PL1.1.23
■ Imaging Unit Sensor Board, PL5.1.21
■ Print Engine Map 8 (page 10-11)
■ Print Engine I/U Sensor Board (page 10-41)
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1
Is the Imaging Unit installed and seated
properly?
Go to Step 2]. Reseat the
Imaging Unit.
2
Visually inspect the Imaging Unit Contact
Assembly and springs.
Are the contacts free from damage and
debris?
Go to Step 3. Clean or replace
the Imaging
Drum contacts.
3
Use service diagnostics to test the CMYK
IU Sensor.
Does the sensor function correctly?
Replace the Engine
Controller Board
(
page 8-112).
Go to Step 4.
4
Verify continuity of the CTG0 harness.
Is the harness conductive?
Replace the Imaging
Unit Sensor Board
(
page 8-142).
Replace the
harness.