Brother HL-3040CN Service Manual page 84

■ 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 HVPS control PCB failure
2 Main PCB failure
■ Error code 3A
Print Unable 3A
Turn the power off and then back on again.
Engine PCB transfer error (disconnection)
Step
1 Harness connection failure of
engine PCB ASSY
2 Engine PCB failure
3 Main PCB failure
Cause
Cause
3-20
Remedy
Replace the HVPS control PCB ASSY.
Replace the main PCB ASSY.
Remedy
Check the harness connection between
the main PCB ASSY and engine PCB
ASSY, and reconnect it.
Replace the engine PCB ASSY.
Replace the main PCB ASSY.
Confidential