Brother DCP-7080 Service Manual page 67

 Error code 0300
Print Unable 03
Turn the power off and then back on again.
Cannot detect the lock signal of the polygon motor for the laser unit (second time).
Error code 0305
-
Cannot detect the lock signal of the polygon motor for the laser unit (first time).
Error code 0401
Print Unable 04
Turn the power off and then back on again.
Cannot detect the synchronized signal of the polygon motor for the laser unit (second time).
Error code 0405
-
Cannot detect the synchronized signal of the polygon motor for the laser unit (first time).
Step
Connection failure of the laser
1
unit flat cable
Laser unit flat cable failure
2
Laser unit failure
3
Main PCB failure
4
Cause
Reconnect the laser unit flat cable.
Replace the laser unit flat cable.
Replace the laser unit.
Replace the main PCB ASSY.
2-32
Remedy
Confidential