Brother HL-4140CN Service Manual page 65

■ Error code 36
Print Unable 36
Turn the power off and then back on again.
Error in the high-voltage power supply PCB while the printer is in the standby mode.
Step
1 Harness connection failure of
high-voltage power supply PCB
2 High-voltage power supply PCB
failure
3 Engine PCB failure
4 Main PCB failure
■ Error code 37
Print Unable 37
Turn the power off and then back on again.
Belt unit temperature sensor error.
Step
1 Harness connection failure of
belt unit temperature sensor
2 Belt unit temperature sensor
failure
3 Main PCB failure
■ Error code 38
Print Unable 38
Turn the power off and then back on again.
External temperature sensor error.
Error code 39
Print Unable 39
Turn the power off and then back on again.
External humidity sensor error.
Step
1 External temperature/humidity
sensor failure
2 High-voltage power supply PCB
failure
3 Main PCB failure
Cause
Cause
Cause
2-34
Remedy
Check the harness connection of the
high-voltage power supply PCB ASSY
and reconnect it.
Replace the high-voltage power supply
PCB ASSY.
Replace the engine PCB ASSY.
Replace the main PCB ASSY.
Remedy
Check the harness connection of the belt
unit temperature sensor and reconnect it.
Replace the registration mark sensor
holder ASSY.
Replace the main PCB ASSY.
Remedy
Replace the high-voltage power supply
PCB ASSY.
Replace the high-voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
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