Service Call Error - Brother HL-4040CN Service Manual

2.2.2 Service Call Error

Check the User Check items first. If the same problem occurs follow each procedure in the
order of the number described in the Step column in the table below.
Error code 20(K)
Print Unable 20
Turn the power off and then back on again.
Laser diode failure (K)
Error code 21(Y)
Print Unable 21
Turn the power off and then back on again.
Laser diode failure (Y)
Error code 22(M)
Print Unable 22
Turn the power off and then back on again.
Laser diode failure (M)
Error code 23(C)
Print Unable 23
Turn the power off and then back on again.
Laser diode failure (C)
Step
1 Laser unit harness connection
failure
2 Laser unit failure
3 Engine PCB failure
Error code 24
Print Unable 24
Turn the power off and then back on again.
Internal temperature sensor failure
Step
1 Harness connection failure of
internal temperature sensor
2 Engine PCB failure
Cause
Check the two harness connections of the laser
unit and reconnect them.
Replace the laser unit.
Replace the engine PCB ASSY.
Cause
Check the harness connection of the internal
temperature sensor and reconnect it.
Replace the engine PCB ASSY.
1-10
Remedy
Remedy
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