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Error code 6801
The side thermistor detected a temperature higher than the specified value.
<User Check>
• Lower the room temperature.
• Keep the machine away from heating appliances.
• Check that the fan is not clogged.
Error code 6901
Some fuser unit errors occurred at power-ON or upon recovery from sleep mode.
Error code 6902
After the error was detected at the fuser unit, power was turned ON again and the error is
being checked. (If power is turned OFF and ON after error code 6901 occurred, this code is
displayed for about 15 minutes.)
Step Cause Remedy
1
Connection failure of the side
thermistor harness
Reconnect the side thermistor harness.
2 Fuser unit thermistor failure Replace the fuser unit.
3 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 PCB harness
Reconnect the eject sensor PCB harness.
3 Fuser unit failure Replace the fuser unit.
4 Eject sensor PCB failure Replace the eject sensor PCB ASSY.
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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