I have a Bally Atlantis that I picked up about a month ago that was missing the sound interface board. I finally tracked down the board and installed it but the sound is extremely quiet!

Hopefully someone has a few ideas of things I can try? Btw this game has the Willliams D-11581 sound board. Thanks!

Thanks for your response Taxman.

The only volume I have is when the pot inside the cabinet is turned all the way up. I don't believe this sound board has a pot to adjust or if it does I can't see it.

I have also reseated all of the connectors in the backbox.

Here's a picture of my sound board and sound interface card. Thanks!

IMG_3607 (resized).JPG

Anyone have some suggestions?

Thanks

I’ve left this alone for a couple of years but was looking into it again tonight. I replaced the pot but still super quiet.

Does anyone have any other ideas? Thanks

slochar Thanks! I'll try this tonight!

Here are my voltage readings

J3 connector on the sound board
1- 5v
2- -20v
3- -22v
4- Keyed
5- 10.8v
6- 17.4 v

J2 on the interface board

1-
2- 16.5v
3- -20v
4-
5- -13v
6- 5v

J4 connector on the interface board

1- 16.2v
2-
3- 5v
4-

I also tested on the power supply TP5 and read 16.5v.

The sound seems to be coming out of all speakers and other than the occasional crackle sound everything is very quiet.

slochar do you think I should replace LT1054?

Tonight I replaced the LT1054 chip and a transistor on the interface board and I finally have sound!!!

Thanks for your help slochar