Brother MFC-7450

1-11
Confidential
■ Error code 68
Fuser unit failure (The side thermistor detects higher temperature than the specified value.)
Error code 69
Fuser unit failure (The side thermistor detects lower temperature than the specified value.)
Error code 6A
Fuser unit failure (The side thermistor does not detect 60°C within the specified time.)
Error code 6B
Fuser unit failure (The center thermistor does not detect 100°C within the specified time.)
Error code 6C
Fuser unit failure (The center thermistor detects higher temperature than the specified value.)
Error code 6D
Fuser unit failure (The center thermistor detects lower temperature than the specified value.)
Error code 6E
Fuser unit failure (The center thermistor does not detect temperature rising within the specified time.)
Error code 6F
Fuser unit failure (The center and side thermistors detect extremely high temperature.)
Print Unable 68
See Troubleshooting and routine maintenance chapter in User’s Guide.
Print Unable 69
See Troubleshooting and routine maintenance chapter in User’s Guide.
Print Unable 6A
See Troubleshooting and routine maintenance chapter in User’s Guide.
Print Unable 6B
See Troubleshooting and routine maintenance chapter in User’s Guide.
Print Unable 6C
See Troubleshooting and routine maintenance chapter in User’s Guide.
Print Unable 6D
See Troubleshooting and routine maintenance chapter in User’s Guide.
Print Unable 6E
See Troubleshooting and routine maintenance chapter in User’s Guide.
Print Unable 6F
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.
3 LVPS PCB unit failure Replace the LVPS PCB unit.
4 Main PCB failure Replace the main PCB ASSY.