Brother DCP-L8400CDN Service Manual page 87

■
Error code 6801
Cooling Down
Wait for a while
The internal temperature sensor or side thermistor of the fuser unit detected a temperature
higher than the specified value.
< User Check >
- Decrease the room temperature.
- Place the machine away from a heater.
Step
1 Connection failure of the internal
temperature sensor harness
2 Side thermistor of the fuser unit
failure
3 Main PCB failure
■
Error code 6901
Self-Diagnostic
Turn the power off, then on again. Leave the machine for 15 min.
Some fuser unit errors occurred at power-ON or upon recovery from sleep mode.
Error code 6902
Self-Diagnostic
Will Automatically Restart within 15 minutes.
After the errors 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
1 Connection failure of each
harness of the fuser unit
2 Connection failure of the eject
sensor PCB harness
3 Fuser unit failure
4 Eject sensor PCB failure
5 Low-voltage power supply PCB
failure
6 Main PCB failure
Note:
- Turn OFF the power switch. After checking that the fuser unit has cooled sufficiently, turn
ON the power switch again and leave the machine for ten minutes. This problem may
then be cleared.
- To clear the fuser unit error after the remedy of the error is taken, enter the maintenance
mode and then exit from the maintenance mode using Function code 99.
Cause
Reconnect the internal temperature
sensor harness.
Replace the fuser unit.
Replace the main PCB ASSY.
Cause
Reconnect each harness of the fuser unit.
Reconnect the eject sensor PCB harness.
Replace the fuser unit.
Replace the eject sensor PCB ASSY.
Replace the low-voltage power supply
PCB unit.
Replace the main PCB ASSY.
2-57
Remedy
Remedy
Confidential