Brother HL-4140CN Service Manual page 63

■ Error code 31
Print Unable 31
Turn the power off and then back on again.
Density sensor error.
Step
1 Harness connection failure of
registration mark sensor holder
ASSY
2 Registration mark sensor holder
ASSY failure
3 Main PCB failure
■ Error code 32
Print Unable 32
Turn the power off and then back on again.
Registration mark sensor shutter operation error.
<User Check>
- Check if there is a scratch, dirt or the like on the belt unit. If there is, replace the belt unit
with a new one.
Step
1 Foreign object around
registration mark sensor shutter
2 Harness connection failure of
registration mark sensor holder
ASSY
3 Harness connection failure of
shutter solenoid
4 High-voltage power supply PCB
failure
5 Registration mark sensor holder
ASSY failure
6 Main PCB failure
Cause
Cause
2-32
Remedy
Check the harness connection of the
registration mark sensor holder ASSY and
reconnect it.
Replace the registration mark sensor
holder ASSY.
Replace the main PCB ASSY.
Remedy
Remove the foreign object.
Check the harness connection of the
registration mark sensor holder ASSY and
reconnect it.
Check the harness connection of the
shutter solenoid and reconnect it.
Replace the high-voltage power supply
PCB ASSY.
Replace the registration mark sensor
holder ASSY.
Replace the main PCB ASSY.
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