The GND pin goes to the GND pad (square pad). Assemble the blue connector, and
plug the cable to CN3.
Five components need adjusting. They are T4, L2, VC1, 10k variable on CN2, and L3.
Pug the 7-pin ribbon cable to CN5, speaker cable to CN6. Plug in the encoder. The MIC
cable is not very long. Connect it later. BFO frequency can be measured in this stage.