| 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 |
