(Topic ID: 196477)

Bally Black Belt sound problem (Turbo Cheap Squeak sound board)

By frunch

4 years ago

Topic Stats

  • 7 posts
  • 2 Pinsiders participating
  • Latest reply 4 years ago by frunch
  • No one calls this topic a favorite


Linked Games

#1 4 years ago

I'm working on a Bally Black Belt where the background sound cuts out intermittently mid-game. It's weird, the background sounds will work fine, then cut out--but the sounds made by hitting targets etc still work. Then on the next ball, background sound is back...and eventually cuts out sooner or later. I replaced the 4 commonly-replaced electrolytic caps from a kit purchased from Marco. I reflowed the solder on the header pins and re-pinned the female connectors. Seemed to improve for a bit, but it's still doing it. Any ideas?

Edit: i also changed the potentiometer on the coin door and the pot VR1 on the sound board

#2 4 years ago

Is there a volume potentiometer on the board? They get crusty. Turn it back and forth a dozen times.

#3 4 years ago

You know, i just realized i forgot to mention that i changed the little pot on the board, vr1. There was an issue with the old one. I'll try turning the new one back and forth a few times and recheck all my work on the board just to be sure. Thanks!

#4 4 years ago

There should not be an issue with a new pot. So if there is a main one in the coin door check that one.

#5 4 years ago

Haha forgot that one too, coin door pot has also been replaced. My next move is to replace the male header pins. I was also reading about a freeze-spray method where you blow it at the various chips to see if hitting a particular one gets the sounds working properly... Gonna have to try that too.

#6 4 years ago

I would not put too much into the freeze spray with an intermittent issue. If that worked you would probably feel an Op-Amp getting hot or even see a discoloration.

Cutting in and out would usually be Pot or solder joint (cold or cracked). So you did all of the right things.

But, I remember back about 15 years ago when my sound on an IJ was doing something similar. Lloyd told me to redo the solder. I did and it didn't work. He said do it again. I did and it didn't work. He said do it again. I took the board and cleaned most of the solder off and redid the whole thing like a lunatic. Never had an issue again.

So, hit the solder again. Look for a cracked trace near the headers. Make sure any parts you replaced you didn't pull out the thru-hole and it has good continuity on both sides of the board.

You'll squash this bug.

#7 4 years ago

Awesome, thanks for the tips! I'll give it another shot!

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