Brother HL-L5000D Service Manual page 79

 Electrodes location of the toner cartridge and drum unit
 Electrodes location of the machine
 Error code 6801
The side thermistor of the fuser unit or internal temperature sensor detected a temperature
higher than the specified value.
<User Check>
• Lower the room temperature.
• Keep the machine away from heating appliances.
Step
Connection failure of the internal
1
temperature sensor harness
Internal temperature sensor
2
failure
3 Fuser unit side thermistor failure Replace the fuser unit.
4 Main PCB failure
Fig. 2-6
Fig. 2-7
Cause
Reconnect the internal temperature sensor
harness.
Replace the main frame L ASSY.
Replace the main PCB ASSY.
2-53
Side surface of
drum unit
Bottom surface of
drum unit
Remedy
Confidential