Fuser Failure - U4-N Over Heat / Thermistor - Fuji Xerox Phaser 5500 Service Manual

Fuser On Time Troubleshooting Procedure (Continued)
Step Actions and Questions
10
Check the Fuser connection.
Is P/J6 connected?
11 Check continuity between the Fuser and
LVPS.
Is there continuity on each wire
between P/J600 <=> P/J6?
12 Check for +5 V to the Fuser.
Is there +5 V between these pins?
P/J6-1 <=> P6-2
P/J6-1 <=> P6-3
P/J6-1 <=> P6-4
13 Check the LVPS and the Engine Logic
Board connection.
Are P/J401 and P/J525 connected?

Fuser Failure - U4-n Over Heat / Thermistor

The Fuser failed to reach temperature within the warm-up period. The control
thermistors has detected a temperature higher than the specified value, or one of the
thermistors has failed.
Applicable Error Codes
Fuser Failure - U4-2 Over Heat Temp
Fuser Failure - U4-3 FS1 Thermistor
Fuser Failure - U4-4 FS2 Thermistor
Fuser Failure - U4-5 Pressure Roller Thermistor
Fuser Thermistor Troubleshooting Reference
Applicable Parts
Fuser
LVPS
Error Messages, Codes, and Procedures
Yes
Go to Step 11.
Go to Step 12.
Replace the Fuser
(page 8-76)
Replace the
Engine Logic
Board
(page 8-89).
References
Print Engine P/J Fuser and Exit 1 (page 10-8)
"Print Engine Fuser Wiring (page 10-22)
PL6.1 Fuser and Exit 1 Unit (page 9-34)
PL8.1 Print Engine Electrical (page 9-40)
No
Connect P/J6.
Repair the wiring.
Replace the
LVPS
(page 8-92).
Connect P/J401
and P/J525.
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