Xerox 7300B - Phaser Color Laser Printer Service Manual page 79

Troubleshooting Procedure Table
Steps Actions and Questions
9 Verify the Low Voltage Power Supply to
the POWER connector on the Engine
Controller Board is supplying +34 volts to
pins 12, 13, and 14.
10 Check the Imaging Unit wiring harness.
Is the wiring harness defective?
11 Inspect the Printer Unit Chassis for
warping or damage.
U30: Flash Hardware Failure
U31: Flash Software Failure
Troubleshooting Procedure Table
Steps Actions and Questions
1 Cycle power to the printer.
Does the error reappear?
U32: Fuser Fan Failure
Troubleshooting Procedure Table
Steps Actions and Questions
2 Verify +34 volts is being supplied to fuse
F7 on the Engine Controller Board.
Is there +34 volts?
3 Verify +34 volts is being supplied to fuse
F7 on the Engine Controller Board.
Is there +34 volts?
4 Verify the Low Voltage Power Supply to
the POWER connector on the Engine
Controller Board is supplying +34 volts to
pins 12, 13, and 14.
Error Messages and Codes
Yes
Replace the
Imaging Unit
Motor.
Replace the wiring
harness.
Replace the
Printer Unit
Chassis.
Yes
Replace the
Engine Controller
Board.
Yes
Replace the
defective fan and
wiring harness.
Replace the
defective fan and
wiring harness.
Replace the
Engine Controller
Board.
No
Replace the Low
Voltage Power
Supply and/or
wiring harness.
Replace the
Engine Controller
Board.
Replace the
Engine Controller
Board.
No
Complete
No
Go to step [2].
Go to step [3].
Replace the Low
Voltage Power
Supply and/or
wiring harness.
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