DX 77 HML
Notice on the bottom side of the main board towards the front there is a small jumper wire soldered to the board.  One end of the wire is soldered to ground and the other end is soldered across two pins.  Remove this wire and at the same time make sure that the two pins are no longer shorted together.  Near the front of the radio is a plug with 3 wires on it that is not connected to anything.  Locate the 3 pins that stick up from the main board normally marked "10k" and push the plug on to these pins.
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

Unmarked VR in 77 HML by R189  -  AM/FM  Medium power
Hosted by www.Geocities.ws

1