Xerox 7300B - Phaser Color Laser Printer Service Manual page 75

U7: Feeder Home Failure
Troubleshooting Procedure Table
Steps Actions and Questions
1 Visually inspect the MPT Liftplate by
printing a job to the MPT.
Does the liftplate operate correctly?
2 Use service diagnostics to check the
registration motor.
Is the motor operating correctly?
3 Use service diagnostics to test the MPT
Roller Home sensor.
Does the sensor function correctly?
4 Inspect the wiring harness to the MPT.
Is the wiring harness defective?
U8: Controller Fan Failure (Electrical Card Cage)
Troubleshooting Procedure Table
Steps Actions and Questions
1 Visually inspect the Electrical Cage Fan
operation and airflow.
Does the fan operate correctly?
2 Inspect the wiring harness to the fan.
Is the wiring harness defective?
3 Verify +34 volts is being supplied to fuse
F7 on the Engine Controller Board.
Is there +34 volts?
Error Messages and Codes
Yes
Go to step [3].
Replace the MPT
Pick Assembly.
Replace the
Engine Controller
Board.
Replace the wiring
harness.
Yes
Replace the
Engine Controller
Board.
Replace the
Electrical Cage
Fan.
Replace the
Engine Controller
Board.
No
Go to step [2].
Replace the
Registration
Motor.
Go to step [4].
Replace the
Engine Controller
Board.
No
Go to step [2].
Go to step [3].
Replace the Low
Voltage Power
Supply.
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