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Error code 6801
The side thermistor of the fuser unit or internal temperature sensor detected a temperature
higher than the specified value.
Error code 6901
An error occurred in the fuser unit when the power switch was turned ON or sleep mode was
released.
Error code 6902
Rechecking the error after the power switch was turned OFF and then ON again because an
error was detected in the fuser unit.
(This message is displayed for approximately 15 minutes when the machine is restarted after
error code 6901 has occurred.)
<User Check>
• Lower the room temperature.
• Keep the machine away from heating appliances.
Step Cause Remedy
1
Connection failure of the internal
temperature sensor harness
Reconnect the internal temperature sensor
harness.
2
Internal temperature sensor
failure
Replace the main frame L ASSY.
3 Fuser unit side thermistor failure Replace the fuser unit.
4 Main PCB failure Replace the main PCB ASSY.
Step Cause Remedy
1
Connection failure of a fuser unit
harness
Reconnect the fuser unit harness.
2
Connection failure of the eject
sensor harness
Reconnect the eject sensor harness.
3 Eject sensor PCB failure Replace the eject sensor PCB ASSY.
4 Fuser unit failure Replace the fuser unit.
5
Low-voltage power supply PCB
failure
Replace the low-voltage power supply PCB
ASSY.
6 Main PCB failure Replace the main PCB ASSY.
Note:
• Turn OFF the power switch. After the fuser unit has cooled sufficiently, turn ON the
power switch again and leave the machine for 15 minutes. This problem may then be
cleared.
• To release the fuser unit error after taking appropriate measures, enter the
maintenance mode once and quit it with the function code 99.
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