DX 99 V
1)  Locate the small circuit board that is located on the side towards the rear of the radio.
2)  Remove the jumper wire that is soldered on to the solder side of this board.
3)  Remove the two screws that hold this board in place and underneath you will notice a
      connector thats not plugged in.  Plug it back in.
VR1  AM/FM  S-meter
VR2  SSB  S-meter
VR3  SSB  Squelch
VR4  AM/FM  Squelch
VR5  FM deviation
VR7  SSB Carrier Balance
VR8  RF meter
VR10  Final Bias
VR11  Driver Bias
VR12  SSB ALC
VR13  AM/FM  High power
VR14  AM  Modulation
VR16  AM/FM  Low power
VR20  Final Bias
VR21  TX offset
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