Brother HLL3290CDW Service Manual page 99

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Error code 0501
The center thermistor of the fuser unit has not reached the specified temperature within the
specified time.
Error code 0502
The center thermistor of the fuser unit has not reached the specified temperature within the
specified time after it was heated normally to the certain level.
Error code 0503
The center thermistor of the fuser unit detected a temperature higher than the specified value.
Error code 0504
After the heat unit was heated normally, the center thermistor of the fuser unit detected a
temperature lower than the specified value.
Error code 0505
The center thermistor of the fuser unit detected a temperature rise greater than the specified
value within the specified time.
Error code 0506
The center thermistor of the fuser unit detected a temperature fall greater than the specified
value within the specified time.
<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
Cause
2-63
Remedy
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.
Replace the fuser unit.
Replace the low-voltage power supply
PCB.
Replace the main PCB.
Confidential