King KMA 20 TSO Audio Input

Continuing the ongoing saga of my avionics repairs, I took my plane away
from the shop - they broke my ADF and I have now bought a King KR 86 ADF
which someone else is installing. Right now we are stalled though as he
doesn't have a schematic for my King KMA 20 TSO audio panel and we need
either a schematic, or alternatively we need to know which pin in the
back of the unit is the audio input pin.

Any help gratefully received

Thanks

Tony
C-GICE


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Tony Roberts
PP-ASEL
VFR OTT
Night
Cessna 172H C-GICE