Brother HL-4140CN Service Manual page 66

■ Error code 3A
Print Unable 3A
Turn the power off and then back on again.
Engine PCB transfer error. (Communication error between the main CPU and sub CPU.)
Step
1 Harness connection failure
between engine PCB and main
PCB
2 Engine PCB failure
3 Main PCB failure
■ Error code 3B
Print Unable 3B
Turn the power off and then back on again.
Main PCB DRAM access error.
Step
1 Main PCB failure
■ Error code 3C
Print Unable 3C
Turn the power off and then back on again.
Main PCB error. (Write error in NVRAM.)
Error code 3D
Print Unable 3D
Turn the power off and then back on again.
Main PCB error. (Read error in NVRAM.)
Error code 3E
Print Unable 3E
Turn the power off and then back on again.
Main PCB error. (Bus error in NVRAM.)
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
2-35
Remedy
Check the harness connection between
the engine PCB ASSY and main PCB
ASSY, and reconnect it.
Replace the engine PCB ASSY.
Replace the main PCB ASSY.
Remedy
Replace the main PCB ASSY.
Remedy
Replace the main PCB ASSY.
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