Brother FAX-2840 Service Manual page 71

Error code 6F
Print Unable 6F
Turn the power off and then back on again.
The center thermistor or the side thermistor of the fuser unit detected a temperature error.
Step
Connection failure of the fuser
1
unit harness
2 Fuser unit failure
Low voltage power supply PCB
3
failure
4 Eject sensor PCB failure
5 Main PCB failure
Error code 70
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.
---
An unidentified error occurred.
<User Check>
• Turn OFF the power switch, and turn it ON again after a while.
Step
1 Main PCB failure
Cause
Reconnect the fuser unit harness.
Replace the fuser unit.
Replace the low voltage power supply PCB
ASSY.
Replace the eject sensor PCB ASSY.
Replace the main PCB ASSY.
Cause
Replace the main PCB ASSY.
2-34
Remedy
Remedy
Confidential