Brother HL-5450DN - Page 73

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 Error code 6A00
The center thermistor of the fuser unit has not reached the specified temperature within the
specified time.
Error code 6B00
The center thermistor of the fuser unit has not reached the specified temperature within the
specified time.
Error code 6C00
The center thermistor of the fuser unit detected a temperature higher than the specified
value.
Error code 6D00
After the heat unit was heated normally, the center thermistor of the fuser unit detected a
temperature lower than the specified value.
Error code 6E00
The center thermistor of the fuser unit detected that the heat unit was not heated.
Error code 6F00
The center thermistor or the side thermistor of the fuser unit detected a temperature error.
Fuser Error / Print Unable 6A
Fuser Error / Print Unable 6B
Fuser Error / Print Unable 6C
Fuser Error / Print Unable 6D
Fuser Error / Print Unable 6E
Fuser Error / Print Unable 6F
<User Check>
• Turn OFF the power switch. After several seconds, turn ON the power again and check
that this error is reset.
Step Cause Remedy
1
Connection failure of the center
or side thermistor harness of
the fuser unit
Check the connection of the center or side
thermistor harness of the fuser unit, and
reconnect it if necessary.
2
Connection failure of the heater
harness of the fuser unit
Check the connection of the heater harness of
the fuser unit, and reconnect it if necessary.
3
Connection failure of the eject
sensor PCB harness
Check the connection of the eject sensor PCB
harness, and reconnect it if necessary.
4
Connection failure of the low-
voltage power supply PCB
harness
Check the connection of the low-voltage power
supply PCB harness, and reconnect it if
necessary.
5
Eject sensor PCB failure Refer to "1.3.8 Check sensor operation
(function code: 32)" in Chapter 5 to check the
sensor operation. If the sensor operation is
faulty, replace the eject sensor PCB ASSY.
6 Fuser unit failure Replace the fuser unit.
7
Low-voltage power supply PCB
failure
Replace the low-voltage power supply PCB
ASSY.
8 Main PCB failure Replace the main PCB ASSY.