Brother MFC-9440CN - Page 33

Confidential
1-14
Error code 38
Print Unable 38
Turn the power off and then back on again.
THM (Thermistor) sensor failure
Error code 39
Print Unable 39
Turn the power off and then back on again.
HUM (Humidity) sensor failure
Step Cause
Remedy
1 Harness connection failure of
THM/HUM sensor
Check the harness connection of the THM/HUM
sensor and reconnect it.
2 THM/HUM sensor failure Replace the THM/HUM sensor holder ASSY.
3 Engine PCB failure Replace the engine PCB ASSY.
Error code 3A
Print Unable 3A
Turn the power off and then back on again.
Error code 7C
Print Unable 7C
Turn the power off and then back on again.
Engine communication error
Step Cause
Remedy
1 Harness connection failure
between engine PCB and
main PCB
Check the harness connection between the engine
PCB and main PCB, and reconnect it.
2 Engine PCB failure Replace the engine PCB ASSY.
3 Main PCB failure Replace the main PCB ASSY.