Brother DCP-7057 Service Manual page 105

■ Error code E7 to E9, EA, EB
These errors do 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.
---
Error, which cannot be specified, occurs.
<User Check>
• Turn OFF the power switch, and turn it ON again after a while.
Step
1 Main PCB failure
■ Error code EC
Print Unable EC
Turn the power off and then back on again.
Fuser fan error.
Step
Harness connection failure of fuser
1
fan
2 Fuser fan failure
High voltage power supply PCB
3
failure
4 Main PCB failure
■ Error code ED
Print Unable ED
Turn the power off and then back on again.
Communication with the wireless LAN PCB cannot be established upon startup of the power
supply. (Wireless LAN model only)
Step
Harness connection failure of
1
wireless LAN PCB
2 Wireless LAN PCB failure
3 Main PCB failure
Cause
Cause
Cause
2-68
Remedy
Replace the main PCB ASSY.
Remedy
Check the harness connection of the fuser
fan and reconnect it.
Replace the fuser fan.
Replace the high voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Remedy
Check the harness connection of the
wireless LAN PCB and reconnect it.
Replace the wireless LAN PCB ASSY.
Replace the main PCB ASSY.
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