(Topic ID: 266167)

Bally Blackbelt A080-91855 Sound board

By oldskooler

2 years ago



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  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by oldskooler
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#1 2 years ago

Hello everyone,

Cut a long story short the board was working. However (yes I did mess with it) the small pot on the board was crackling, when turned up/down.

So I removed the board, and had a look at the pot. 1Kohm..tests fine, resoldered it for now, will replace later.

Plugged back in..3x led flashes.. and nothing. Lots of crackling, when I turn the pot, but no actual sound.

I've read through previous posts, with similar symptoms. No definite answers.

So far I have:
Reflowed all the connections, checked any open circuits with the big transistors U12 and U13. All good.
Reseated all chips / ROMS.

Still the board boots correctly. And there is 5vDC on the TP1/2.

I'm kicking myself..WTF was I thinking. Quarantine makes work for idle hands. Plus there are no spare boards. But my board boots correctly!!.

Any ideas..I'm taking a couple of hours out, and try again tomorrow.

Thanks for any help.

Jaime

#2 2 years ago

You may have a broken DAC at U9.
Does your board still have C30 on it?
That may be your problem.
There is a service bulletin about removing this capacitor.
I can't find it right now, but here is a topic on it.
https://forums.arcade-museum.com/showthread.php?t=172443

#3 2 years ago

Thank you, I'll look into that part of the board, and see if it is the issue. I'll update with my findings

Jaime

#4 2 years ago

So far I've:
Reflowed the entire board.
Replaced capacitors.
Replaced 1K pot
Reseated all IC's

No joy. Still no sound
Looked at the main board. One connector had backed off. Pushed it down. Sound returns!!

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