Brother MFC-7450

1-12
Confidential
■ Error code 71
Laser unit Polygon mirror motor failure
(Cannot detect the period signal of the polygon mirror motor.)
Error code 72
BD beam detect sensor malfunction
■ Error code 76
Fuser unit failure (The center thermistor detects rapidly rising temperature.)
■ Error code 77
Fuser error code failure (The error history of the fuser unit is deleted.)
Print Unable 71
See Troubleshooting and routine maintenance chapter in User’s Guide.
Print Unable 72
See Troubleshooting and routine maintenance chapter in User’s Guide.
Step Cause Remedy
1
Laser unit harness connection
failure
Check the two harness connections of the
laser unit and reconnect them.
2 Laser unit failure Replace the laser unit.
3 Main PCB failure Replace the main PCB ASSY.
Print Unable 76
See Troubleshooting and routine maintenance chapter in User’s Guide.
Step Cause Remedy
1
Fuser unit harness connection
failure
Check the harness connection of the fuser
unit and reconnect it.
2 Fuser unit failure Replace the fuser unit.
Print Unable 77
See Troubleshooting and routine maintenance chapter in User’s Guide.
Step Cause Remedy
1 Fuser unit failure Replace the fuser unit.
2 Main PCB failure Replace the main PCB ASSY.