Brother HL-5440D Service Manual page 87

Error codes CA00 to DC00
These errors do not usually occur during normal use. The possible causes are noise around
the installation site, fluctuation of the power supply voltage, and failures in the software.
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An unidentified error occurred.
Step
1 Main PCB failure
Error code DD00
Print Unable DD
Fuser unit error (except error codes 6A00 to 6F00, 7600, 7800, DE00, and E200)
<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
Low-voltage power supply PCB
6
failure
7 Fuser unit failure
8 Main PCB failure
Cause
Replace the main PCB ASSY.
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 low-voltage power supply PCB
ASSY.
Replace the fuser unit.
Replace the main PCB ASSY.
2-51
Remedy
Remedy
"1.3.8 Check sensor operation
to check the
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