Cause : Communications Option Board DPRAM Error comes when communications Option Board faulty or hardware issue in drive power card or control card.

1. Try turning the power supply off and on again.
2. The copy function of the Digital Operator was used during communications.
   • Use the copy function off-line.
   • Use the copy function with an option board removed.
3. The option board is not connected properly.
4. Turn off the power and insert the board again.