1 Disconnect the power and antenna.
2. Remove case screws and case.
3. Locate Digital Unit B. This is the board that is in the enclosure where the VS-1 is mounted. Digital Unit B is the board closest to the Front Panel.
4. Cut Diodes D130 & D135. Located near IC-109.
5. Reassemble the radio
6. Turn the radio on, Press and Hold the [A=B] Switch and turn off and back on the radio.