Xerox Phaser 7760 Service Manual page 217

010-349 Fuser Front Thermistor Open
The Front Thermistor open error. This is a cold condition.
Troubleshooting References
Table 1 References
Applicable Parts Part List
Engine Control Board PL 13.1
(MCU PWB)
Fuser PL 7.1
NOTE: If this failure reoccurs three times successfully, an Engine NVRAM value is set prevent-
ing further printer use until the Clear Tech Rep Faults
Troubleshooting Procedure
Table 2 Procedure
Step Actions and Questions
1 1. Turn the printer power Off and remove
the Fuser Assembly.
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?
2 1. Reinstall the Fuser Assembly.
2. Enter Service Diagnostics Menu
to Control Panel Diagnostics). Run the
Fuser Temperature test.
3. Is the temperature indicated approxi-
mately 165°C?
3 1. Turn the printer power Off.
2. Check for an open circuit or poor con-
nection between J600-4 J600-6 to
J412-8 to J600-6, and J412-9 to J600-
4.
3. Is the wiring OK?
Revised
Phaser 7760 Color Laser Printer
Wiring and Plug/Jack References
Section 7, Engine Control Board (MCU PWB) Plug/
Jack Locations - Figure 15
Section 7, Fuser Assembly Plug/Jack Locations -
Figure 6
(Section 6) is performed.
Yes No
Go to step 2. Replace the Fuser
(PL 7.1).
Go to step 4. Go to step 3.
(refer
Replace the Engine Repair or replace
Control Board the wiring harness.
(MCU PWB) (REP
1.2).
Figure 1 010-349 Fuser Front and Rear Thermistor
January 2010
2-181
Status Indicator RAP's
010-349