Brother HL-5590DN

2-53
Confidential
 Electrodes location of the toner cartridge and drum unit
Fig. 2-6
 Electrodes location of the machine
Fig. 2-7
 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 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.
Side surface of
drum unit
Bottom surface of
drum unit