Brother HLL3290CDW Service Manual page 116

■
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
Connection failure of a fuser unit
1
harness
Connection failure of the eject
2
sensor harness
3 Fuser unit failure
4 Eject sensor PCB failure
Low-voltage power supply PCB
5
failure
6 Main PCB failure
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.
Cause
2-80
Remedy
Reconnect the fuser unit harness.
Reconnect the eject sensor harness.
Replace the fuser unit.
Replace the eject sensor PCB.
Replace the low-voltage power supply
PCB.
Replace the main PCB.
Confidential