Brother DCP-9055CDN Service Manual page 135

■ Error code EE
Print Unable EE
Turn the power off and then back on again.
Unavailability of communication after connecting to the wireless LAN PCB is detected.
(Wireless LAN model only)
Step
1 Harness connection failure of
wireless LAN PCB
2 Wireless LAN PCB failure
3 Main PCB failure
■ Error code EF
Print Unable EF
Turn the power off and then back on again.
The supplied power is unstable.
<User Check>
- Turn OFF the power switch, and turn it ON again after a while.
Step
1 The irregular power supply is
detected
2 Main PCB failure
Note:
The irregular power supply detection error (Machine Error EF) occurs when there is a large
fluctuation in the power supply voltage supplied to the machine.
In this case, if the same power supply is used, the same error might occur again even if the
low-voltage power supply PCB ASSY is replaced.
Cause
Cause
2-97
Remedy
Check the harness connection of the
wireless LAN PCB and reconnect it.
Replace the wireless LAN PCB.
Replace the main PCB ASSY.
Remedy
Replace the low-voltage power supply
PCB ASSY. Reset the irregular power
supply detection counter following the
procedure described in
MACHINE ERROR EF IS DETECTED
AND THE LOW-VOLTAGE POWER
SUPPLY PCB ASSY IS REPLACED"
in Chapter 4.
Replace the main PCB ASSY.
"5. IF THE
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