Tailgunner sound issues

Malice95

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So tail gunner is working good except for 2 issues.

1. Its pretty dam loud. I checked the schematics and found a 100k
pot on the sound sboard that supposed to adjust the output.
Moving it does nothing.. stays loud.

2. When I hit a ship with the gun I get a LOUD PING instead of
an explosion sound. The explosion sound might be underneath
it but I cant hear it below the ping. Any suggestions in where
to begin looking? I know its the sound board that generates the
sounds (just starting to learn cinematronics). See the vid for an
example.

Anyone work on these boards? Is there a way to power up the sound
board seperatly for testing on a bench? Is it just a matter of applying 5v
to each sounds section and hooking up a speaker?

 
I'm not an expert but my guess would be that you have an issue with the "wideband noise generator" circuit on your sound board, as that circuit handles the explosion sound as well as the background rumble, which you're also missing. Here's what the manual says:

"The Wideband Noise Generator is a common signal source for providing wideband random noise to the discrete audio sections of the board. The noise generator works as follows: diode D1 is a zener diode with random noise levels of typically 200 micro volts generated at its internal junction. This noise will be present at the anode of D1 across resistor R1. The noise is aplified by a factor of 1000 by IC1 and coupled to IC2. IC2 is a band equalizing signal limiter which will balance out the amplitude of the noise frequencies by amplifying the weaker signals and attenuating the stronger signals. The output of IC2 should appear as wideband clipped noise with an aplitude of 1.2 volts peak to peak. IC3 will amplify the noise to approximately 5 volts peak to peak at which time it is ready for use by the sound circuits."

Based on that I would probably start by checking IC2, which I believe is the TL081 circled in the picture.
 

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