Xerox Phaser 7300B, Service Manual

Page: 74 / 277

2-58 Phaser 7300 Color Printer Service Manual
U0: Engine ROM Failure
U1: Engine RAM Failure
U2: Engine EEPROM Failure
U3: Engine EEPROM Missing Failure
U4: Engine SRAM Failure
U5: Engine Control Failure
U6: Power Supply Failure
Troubleshooting Procedure Table
Steps Actions and Questions Yes No
1 Cycle power to the printer.
Does the error still appear? Go to step [2]. Complete
2 Perform an NVRAM Reset.
Does the error still appear? Replace the
EEPROM for U2
or U3 errors.
Replace the
Engine Controller
Board. Complete
Troubleshooting Procedure Table
Steps Actions and Questions Yes No
1 Visually inspect the LVPS fans for proper
operation and airflow.
Are the fans operating correctly? Go to step [4]. Go to step [2].
2 34 volts is being supplied to fuse
F7 on the Engine Controller Board.
Is there +34 volts? Replace the fan. Go to step [3].
3 Verify the Low Voltage Power Supply to
the POWER connector on the Engine
Controller Board is sup34 volts to
pins 12, 13, and 14. Replace the
Engine Controller
Board. Replace the Low
Voltage Power
Supply and/or
wiring harness.
4 Turn the printer off, remove the Duplex
Unit, then turn the printer back on.
Does the error still appear? Replace in the
following order:
Transfer Unit
LVPS
HVPS
Engine Controller
Board. Replace the
Duplex Unit.