Xerox Phaser 7750DXF, Service Manual

Page: 91 / 505

Error Messages and Codes 3-25
Fuser Main Lamp Failure, Code 35
The lamp control circuit has failed resulting in the front thermistor detecting an
overheat condition.
Note
If this failure reoccurs three times successively, an Engine NVRAM value is set
preventing further printer use until the Clear Tech Rep Fault (see pg. 6-20) is
performed.
Troubleshooting References
Applicable Parts Wiring and Plug/Jack Map References
■
Fuser
■
Engine Control Board
Troubleshooting Procedure
Step Actions and Questions Yes No
1 1. Turn OFF power and remove the fuser
assembly and allow it to cool down.
2. Measure the resistance between the
Fuser connector P600-4 and P600-6.
3. Does the resistance measure between
30 K and 190 K Ohms?
Go to step 2. Replace the fuser
assembly.
2
1. Reinstall the fuser assembly.
2. Enter service diagnostics.
3. From the Sensor Tests run the Fuser
Temperature test.
4. Is the temperature indicated
approximately 165
o
C?
Go to step 4. Go to step 3.
3 1. Turn OFF printer power.
2. Measure the resistance between
J641- 2 and J641-3 on the Engine
Control Board.
3. Does the resistance measure between
30 K and 190 K Ohms?
Go to step 4. Repair or replace
the wiring
harness.
4 1. Turn printer power back ON.
2. Is there ~+3.4 VDC between
J590-5 and ground?
Check the AC
wiring harness to
the fuser.
If the check is OK,
replace the AC
drive assembly. Replace the
engine control
board.