Brother 09055CDN Service Manual page 97

■ Error code 6F
Print Unable 6F
Turn the power off and then back on again.
Fuser unit error.
(The center and side thermistors detect extremely high temperature.) (Detection of hardware.)
Step
1 Fuser unit connector connection
failure
2 Fuser unit failure
3 Low-voltage power supply PCB
failure
4 Paper eject sensor PCB failure
5 Main PCB failure
■ Error code 70
Print Unable 70
Turn the power off and then back on again.
Fuser develop motor error.
<User Check>
- Open the fuser cover to check if paper is wound around the fuser unit.
- Replace the toner cartridges except the black toner cartridge.
Step
1 Harness connection failure of
fuser develop motor
2 Fuser develop motor failure
3 Engine PCB failure
4 Low-voltage power supply PCB
failure
5 Main PCB failure
Cause
Reconnect the connector of the fuser unit.
Replace the fuser unit.
Replace the low-voltage power supply PCB
ASSY.
Replace the paper eject sensor PCB
ASSY.
Cause
2-58
Remedy
Replace the main PCB ASSY.
Remedy
Check the harness connection of the
fuser develop motor and reconnect it.
Replace the fuser develop motor.
Replace the engine PCB ASSY.
Replace the low-voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
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