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Brother HL-5440D Service Manual Page 73

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Error code 6A00
Fuser Error / Print Unable 6A
The center thermistor of the fuser unit has not reached the specified temperature within the
specified time.
Error code 6B00
Fuser Error / Print Unable 6B
The center thermistor of the fuser unit has not reached the specified temperature within the
specified time.
Error code 6C00
Fuser Error / Print Unable 6C
The center thermistor of the fuser unit detected a temperature higher than the specified
value.
Error code 6D00
Fuser Error / Print Unable 6D
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
Fuser Error / Print Unable 6E
The center thermistor of the fuser unit detected that the heat unit was not heated.
Error code 6F00
Fuser Error / Print Unable 6F
The center thermistor or the side thermistor of the fuser unit detected a temperature error.
<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 heater
2
harness of the fuser unit
Connection failure of the eject
3
sensor PCB harness
Connection failure of the low-
4
voltage power supply PCB
harness
Eject sensor PCB failure
5
6
Fuser unit failure
Low-voltage power supply PCB
7
failure
8
Main PCB failure
Cause
Check the connection of the center or side
thermistor harness of the fuser unit, and
reconnect it if necessary.
Check the connection of the heater harness of
the fuser unit, and reconnect it if necessary.
Check the connection of the eject sensor PCB
harness, and reconnect it if necessary.
Check the connection of the low-voltage power
supply PCB harness, and reconnect it if
necessary.
Refer to
(function code: 32)" in Chapter 5
sensor operation. If the sensor operation is
faulty, replace the eject sensor PCB ASSY.
Replace the fuser unit.
Replace the low-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
2-37
Remedy
"1.3.8 Check sensor operation
to check the
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