- Remove power and ant.
- Open case like explained in your "operating manual".
- Locate four screws attaching frount panel and remove the top screws. loosen the bottom screws.
- Tilt frount panel forward.
- On the left side of the radio, remove the plug from power supply to the frount panel. (gray and white wires.)
- Locate the jumper position 3 on control board.
- Change the jumper status in position 3.
- Reassemble radio.
- Reset CPU (see your OPERATING MANUAL).