Brother DCP-9055CDN Service Manual page 86

■ Error code 3F
Print Unable 3F
Turn the power off and then back on again.
Write error in engine firmware.
This error does not usually occur in the normal use. The conceivable causes are noise around
the installation site, fluctuation of the power supply voltage, and failures in the software.
<User Check>
- Turn OFF the power switch, and turn it ON again after a while.
Step
1 Main PCB failure
■ Error code 40
Print Unable 40
Turn the power off and then back on again.
Error in the high-voltage power supply PCB while the machine is in operation.
Error code 42
Print Unable 42
Turn the power off and then back on again.
High-voltage power supply PCB transfer error.
Step
1 Harness connection failure of
high-voltage power supply PCB
ASSY
2 High-voltage power supply PCB
failure
■ Error code 43
Print Unable 43
Turn the power off and then back on again.
ASIC error of the main PCB.
This error does not usually occur in the normal use. The conceivable causes are noise around
the installation site, fluctuation of the power supply voltage, and failures in the software.
<User Check>
- Turn OFF the power switch, and turn it ON again after a while.
Step
1 Main PCB failure
Cause
Cause
Cause
2-48
Remedy
Replace the main PCB ASSY.
Remedy
Check the harness connection of the
high-voltage power supply PCB ASSY
and reconnect it.
Replace the high-voltage power supply
PCB ASSY.
Remedy
Replace the main PCB ASSY.
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