Brother HL-L5000D Service Manual page 71

 Error code 050A
The hardware detected a temperature error through the center thermistor or the side
thermistor of the fuser unit.
Error code 050B
When the center thermistor of the fuser unit was lower than the idle temperature, the side
thermistor detected a temperature higher than the specified temperature.
Error code 050C
When the center thermistor of the fuser unit was higher than the idle temperature, the side
thermistor detected a temperature lower than the specified temperature.
<User Check>
• Turn OFF the power switch. After several seconds, turn ON the power again and check
that this error is reset.
Step
Connection failure of the center
1 or side thermistor harness of the
fuser unit
Connection failure of the fuser
2
unit heater harness
Connection failure of the eject
3
sensor harness
Connection failure of the low-
4
voltage power supply harness
5 Eject sensor PCB failure
6 Fuser unit failure
Low-voltage power supply PCB
7
failure
8 Main PCB failure
 Error code 0800
An error occurred in the internal temperature sensor.
Step
Connection failure of the internal
1
temperature sensor harness
Internal temperature sensor
2
failure
3 Main PCB failure
Cause
Reconnect the center or side thermistor
harness of the fuser unit.
Reconnect the fuser unit heater harness.
Reconnect the eject sensor harness.
Reconnect the low-voltage power supply
harness.
Replace the eject sensor PCB ASSY.
Replace the fuser unit.
Replace the low-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Cause
Reconnect the internal temperature sensor
harness.
Replace the main frame L ASSY.
Replace the main PCB ASSY.
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Remedy
Remedy
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