3-80 Phaser 6121MFP Service Manual
Error Messages and Codes
0502 Thermistor Failure, 0510 Fuser Failure, and 0520 Fuser Failure
0502 Thermistor Failure The temperature detected by the thermistor does not
reach an expected level after the warm-up cycle starts.
0510 Fuser Failure The temperature detected by the thermistor remains lower
than expected for a given period of time or longer.
0520 Fuser Failure The temperature detected by the thermistor remains higher
than expected for a given period of time or longer.
Initial Actions
Power down and reboot the printer.
Procedure
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Fuser, PL4.0.13
■ Engine Control Board, PL13.0.20
■ Power Supply, PL13.0.17
■ Board Locations (page 2-10)
■ Map 1 - Engine Control Board
Plug/Jack Locator (page 10-5)
■ Power Supply Wiring (page 10-17)
Troubleshooting Procedure Table
Step Action and Questions Yes No
1 Check that the Fuser is installed
correctly.
Does the problem persist?
Go to step 2. Complete.
2 Check the Engine Control Board
connectors P/J2, P/J3, and P/J6.
Are the connectors seated properly?
Go to step 3 Reseat the
connectors. If
the problem
persists, go to
step 3.
3 Check the Low Voltage Power Supply
connectors CN3, CN5, and CN7.
Are the connectors seated properly?
Go to step 4. Reseat the
connectors. If
the problem
persists, go to
step 4.
4 Replace the Fuser (8-9).
Does the problem persist?
Go to step 5. Complete.
5 Replace the Engine Control Board
(page 8-59).
Does the problem persist?
Go to step 6. Complete.
6 Replace the Power Supply (page 8-72). Complete.
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