Xerox Phaser 7400

3-98 Phaser 7400 Color Printer Service Manual
Feeder Home Failure
Applicable Status Code:
Code U7: Tray 1 (MPT) does not reach home position.
Initial Actions:
■ Cycle the printer's power.
■ If the problem persists follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Home Position Sensor, PL8.1.8
■ Registration Motor, PL4.2.36
■ MPTHOME Harness, PL8.1.9
■ Print Engine Map 9 (page 10-12)
■ Print Engine Front Sensor Board (1/2) (page 10-26)
■ Print Engine Motor Driver Board (4/6) (page 10-34)
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1
Check the Tray 1 (MPT) Lift Plate by
printing a job from Tray 1 (MPT).
Does the Lift Plate operate correctly?
Go to Step 3. Go to Step 2.
2
Test the Registration Motor
Run the Service Diagnostics Registration
Motor B test.
Is the motor operating correctly?
Replace the Tray 1
(MPT) Assembly
(
page 8-25).
Replace the
Registration Motor
(
page 8-39).
3
Test the Tray 1 (MPT) Home Position
Sensor.
Run the Service Diagnostics MPT Roller
Home test.
Does the sensor function correctly?
Replace the Engine
Control Board
(
page 8-112).
Go to Step 4.
4
Check continuity of the MPTHOME
harness.
Is the wiring harness conductive?
Replace the Engine
Control Board
(
page 8-112).
Replace the
MPTHOME
harness.