10 An error was detected by the program ROM check
20 An error was detected by the font ROM check
30 An error was detected by the resident RAM check
40 An error was detected by the EEPROM check
50 A font card error was detected
60 An optional RAM board error was detected
70 A fault occurred with the fan motor
71 A fault occurred with the fusing unit
72 A fault occurred with the thermistor in the fuser (open check error)
73 A fault occurred with the thermistor in the fuser (short check error)
80 An interface time-out occurred between the main controller board and the operator panel
81 An interface time-out occurred between the main controller and the optional tray
90 A watchdog timer time-out occurred
F0 Firmware Program Error
Reprinted with permission from laser-service.com
