Code :
- Code: F0
- Display: F0 - Front control panel error.
- Description: Communication is failed between the front panel and the main controller.
- Code: F1
- Display: F1 - System ROM error
- Description: Checksum is failed with EPROMs on the main controller board.
- Code: F2
- Display: F2 - Main memory error
- Description: Checksum is failed with the RAM on the main controller board.
- Code: F3
- Display: F3 - General failure
- Description: Miscellaneous failure with the main controller, other than F0, F1, and F3, above.