The machine display shows "EC19".
- Machine is not in card / serial mode.
- Machine is in card mode but is not communicating with card reader.
- The MLV harness has been assembled incorrectly.
- Ensure the C-0110-CP jumper is connected to the machine's control board.
- Power cycle the machine. This must be done AFTER the jumper is connected.
- Check to make sure all wires on the MLV harness are in the correct position. (Brown wire may be in the wrong pin position)