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How do I fix an F54 Option Card Fault code for a DG1 drive?

The option card fault is an indication that either an option card or slot on the control board has failed. The drive monitors the software ID and if that value is not received or is corrupted the drive will fault on option card fault. To determine what is the cause power the drive down and verify the option card is seated properly if so, try swapping it to the other slot and power up. If fault continues it would point to the option card being the problem and replacement would be required. If the card works in one slot but not the other try swapping again with power off and power back up see if fault continues with that slot, if so replace the control board.