Xerox 7300B - Phaser Color Laser Printer Service Manual page 72

T1: Fuser Upper Failure
T2: Fuser Lower Failure
Troubleshooting Procedure Table
Steps Actions and Questions
1 Reseat the Fuser Unit.
Did the error reappear?
2 Check the resistance of the lamps.
See "Fuser Roller Resistances" on
page 3-75
3 Check the Fuser thermistors.
Are the thermistors damaged or
misaligned, not in contact with the rollers?
4 Is there AC voltage to the low voltage
power supply CN1 connector?
T29: Temp Sensor Failure
Troubleshooting Procedure Table
Steps Actions and Questions
1 Use Service Diagnostics to check the
current ambient humidity inside the
printer.
Verify proper operation of the sensor by
blowing on it.
Is the sensor operating correctly? See
"Environmental Specifications" on
page 1-15.
Is the printer operating temperature within
its optimal range?
2-56
Yes
Go to step [2].
Go to step [3].
Replace the Fuser. Go to step [4].
Replace the
Engine Controller
Board.
Yes
Replace the
Temp/Humidity
Sensor Board
Replace the
Engine Controller
Board.
Phaser 7300 Color Printer Service Manual
No
Complete
Replace the
Fuser.
Replace Low
Voltage Power
Supply.
No
Notify customer of
the environmental
specifications.