Brother HL-4040CN, HL-4050CDN, HL-4070CDW Service Manual page 54

Error code E6
Print Unable E6
Turn the power off and then back on again.
NVRAM error on main PCB
Step
1 Main PCB failure
Error code EB
Print Unable EB
Turn the power off and then back on again.
NVRAM reading error on laser unit
Step
1 Harness connection failure
between laser unit and main
PCB
2 Laser unit failure
3 Main PCB failure
Error code ED
Print Unable ED
Turn the power off and then back on again.
Failure of wireless LAN connection (Connection to the wireless LAN module is failed when the
machine is turned ON.)
Error code EE
Print Unable EE
Turn the power off and then back on again.
Wireless LAN is unable to communicate. (Any problem that the wireless LAN cannot be
connected is occurred after wireless LAN connection is succeeded.)
User Check
- Turn the power off. Turn it on again after a while.
Step
1 Wireless LAN PCB failure
2 Main PCB failure
Error code EF
Print Unable EF
Turn the power off and then back on again.
Incorrect print coverage value
User Check
- Turn the power off. Turn it on again after a while.
Step
1 Main PCB failure
Cause
Replace the main PCB ASSY.
Cause
Check the harness connection between the laser
unit and main PCB and reconnect it.
Replace the laser unit.
Replace the main PCB ASSY.
Cause
Replace the wireless LAN PCB ASSY.
Replace the main PCB ASSY.
Cause
Replace the main PCB ASSY.
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Remedy
Remedy
Remedy
Remedy
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