A 10 k resistor is connected to pin 10 of the MC3359. A 3.5 mm chassis terminal is mounted in scanner's side, close to the
receiver IC. If you scratch away some paint from the circuit board at the arrow left of the letters 'DIP', the ground lug of the chassis terminal can be soldered directly to the
board. The resistor can be connected directly to the other lug of the 3.5 mm plug. Optionally, you can put some isolation material
on the lead of the resistor.