O
Okay, I'll take a look at those things when I get back to the shop on Tuesday. Regarding pin 4 of the protection board - what kind of voltage should I see on the wire the connects up to it? I believe that wire is tied to both power amps, if I recall the schematic correctly. I mistakenly grounded that pin with the wire disconnected (I was thinking of pin 4 on the IC, not the board - oops), but when I did, the relay stopped cycling - stayed off, I believe. So, grounding pin 4 of the protection board causes the relay to stop cycling (staying off), so is there a particular voltage that should be applied to that pin to cause normal operation of the relay? Just wondering since disconnecting audio inputs/outputs from pins 5,6,7 and 8 really shouldn't matter. All I need for normal operation of the protection relay are the normal voltages provided on pins 1,2,9 & 10 - and a ground on pin 3. Leaving pin 4 as my wildcard, right now.