Bally 6000 sound board question

[ucanwin]

Hi,
I have a question, and I'm sure that one of you knowledgeable members can help me understand my problem.
I have a Bally 6000 Beach Party slot machine that has sound when a hand pay is made, but when a BONUS
symbol comes up on the reels there is no sound for that feature. The feature goes through the motions, and puts
up credits, but there is NO sound. This machine has a sound board on the upper left side of the cabinet with a U-3
chip number PS00000GNRC2-00 BMB 01/22/01  2001  L01-0515 in it. The person that I bought the machine from
told me that this is a generic chip that someone put in the machine, and it is not the correct one. Well.....my
question is....generic or not, shouldn't there be some sort of sound when entering the BONUS feature on this machine?
Is it possible that the board itself might be a problem? Does the sound on a hand pay originate from this board, or is
there a chip on the main board that creates that sound? Someone please enlighten someone who is not smarter than a fifth grader.
Best regards, and thanks for any comments on this issue.
Jerry