10An error was detected by the program ROM check
20An error was detected by the font ROM check
30An error was detected by the resident RAM check
40An error was detected by the EEPROM check
50A font card error was detected
60An optional RAM board error was detected
70A fault occurred with the fan motor
71A fault occurred with the fusing unit
72A fault occurred with the thermistor in the fuser (open check error)
73A fault occurred with the thermistor in the fuser (short check error)
80An interface time-out occurred between the main controller board and the operator panel
81An interface time-out occurred between the main controller and the optional tray
90A watchdog timer time-out occurred
F0Firmware Program Error