(Topic ID: 206151)

Stern SB-100 Sound Card Help

By Cheddar

6 years ago

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Latest reply 6 years ago by Cheddar
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Nugent Stern Electronics, 1978

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I am working on a Stern SB100 Rev B out of a Nugent. I am only getting 2 of the 3 tones. I have been working through the techdose article and I'm pretty sure I can get it fixed from this. I am fortunate the sound generation (most of it) and the amp are verified working.

The issue I have is some extra components. It appears a jumper was replaced with a resistor with a couple of capacitors tied to it. These are at C50 and C52 and connect to U6 pin 10 which is the reset line. C50 is jumpered to the resistor on the back side of the board.

IMG_20171228_171851211 (resized).jpg

Clearly the board is resetting but I was having power issues on this machine that led to inconsistent booting. It's possible that someone put in these components to stabilize the line and get the board to reset.

I swapped in a different sdb and recrimped the power connectors on the rectifier board and the sdb and everything works great in that regard.

Should I remove this hack or leave it in? Maybe this relates to a service bulletin somewhere?

Thanks

Finally found a pic of a Rev b and this looks normal. Marking as resolved.

OP
Quoted from Cheddar:
Finally found a pic of a Rev b and this looks normal. Marking as resolved.

Cheddar - Slightly off topic but it was my sound board (SB-100 in my Trident) that was locking up my MPU, if you run into this I would suggest sending it to http://webpages.charter.net/coinopcauldron/Index.html - The guy who runs it Clive does awesome work. He socketed almost everything on that board and replaced all the caps for like $70 and then put it in a two stage bench testing device. I don't work with him/for him or anything I just had a really good experience and after sending to him I've never had a problem again. Best of Luck!

Quoted from darcangeloel:
cheddar - Slightly off topic but it was my sound board (SB-100 in my Trident) that was locking up my MPU, if you run into this I would suggest sending it to http://webpages.charter.net/coinopcauldron/Index.html - The guy who runs it Clive does awesome work. He socketed almost everything on that board and replaced all the caps for like $70 and then put it in a two stage bench testing device. I don't work with him/for him or anything I just had a really good experience and after sending to him I've never had a problem again. Best of Luck!

Thanks for the tip

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