Hello friends,
I have a Stern SB100 with a very high-pitched and extremely annoying bonus advance sound. Since this is one of the sounds that is not controlled by the three pots on the board, I can find no way to change this sound.

I have tried this board in two different Lectronamo machines and it behaves the same way in both.

There's some great information here:
http://www.techdose.com/projects/Stern-Pinball-SB100-Sound-Board/346/page1.html

But the bonus advance sound isn't really addressed in the link above.

Can anyone tell me what section/components of the board are responsible for this sound? The schematic doesn't provide details on what parts of the board do what.

Any help would be appreciated. Thanks.

Corey

I believe there's 5 sounds on the board: three tones for 10, 100 and 1000 points, one "sound sample" for pop bumper hits and another sound sample for bonus advance. Only the tones are adjustable.

I believe the sound in question here is #5 in solenoid test.