I assume yours is a newer unit
Here is a schematic
from 1996 onward
hope this helps
so what do you have and what dont you have ? on what pins of that ic? voltages ??
pin 8 14.95
pin 4 15.14v pin 1 11.90
if I inject a signal on pin 5 it come through the circuit fine but put into pin 7 nothing comes out
Does the unit have a Spring tank?
do you feed audio in to the tank ?do you feed audio out? of it ?
measure it what it resistance across the spring?
ok so IC 3 pin 7 is where you are loosing it?
measure the resistance to ground across that cap
ok let me know this is strange one
maybe its vcc ? for the ic.s?
pin 1 and IC 1 and IC connect to the feed line for audio to the tank
there is no connection to ic 3 pin 1
pin 1 looks like its switched by trans tr2 in or out of ground
pin 8 and pin 4 look like vcc to this chip pos and neg its an op amp
Are you sure it doesnt go to pin 2 of of ic 3 ? thats signal ground
Is there an R number near it ?