Xerox Phaser 7400

3-66 Phaser 7400 Color Printer Service Manual
Install or Reseat Transfer Unit
The printer does not detect the Transfer Unit.
Initial Actions:
■ Check the installation of the Transfer Unit.
■ Cycle the printer's power.
■ If the problem persists follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Transfer Unit, PL1.1.20
■ Belt Rotation Sensor, PL2.1.146
■ Print Engine Map 1 (page 10-4)
■ Print Engine Map 5 (page 10-8)
■ Print Engine Motor Driver Board (1/6) (page 10-31)
■ Print Engine Motor Driver Board (4/6) (page 10-34)
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1
Test the Belt Rotation Sensor.
Run the Service Diagnostics Belt Hole IC
test.
Does the sensor function correctly?
Go to Step 2. Replace the
sensor (
8-91). If
the error persists,
go to Step
3.
2
Check all pins on the HALL1 Harness for
continuity.
Disconnect HALL1 and P/J310
Is the harness conductive?
Replace the Motor
Driver Board
(
page 8-141).If the
error persists, go to
Step
3.
Replace the
HALL1 Harness.
3
Check all pins of the DRV0 harness for
continuity.
Disconnect the DRV0 ribbon cable.
Is the cable conductive?
Replace the Engine
Control Board
(
page 8-112).
Replace the DRV0
Harness.