(Topic ID: 239989)

stern nugent: sb-100 no sound

By jdoz2

4 years ago



Topic Stats

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Linked Games

  • Nugent Stern Electronics, 1978
#1 4 years ago

Picked up a nugent last week that doesn’t have any sound except sometimes in power up it sounds like it’s screaming all the tones at once.

I repinned the connectors between the mpu and sound board, new header pins for the large top connector and the two bottom ones but I still have no sound. I have new caps on order but haven’t done that yet.

I swear one time the sound worked for a few switch hits then quit which I would think would be a cold solder joint or connector but haven’t seemed to track it down yet.

Does anyone have any advice? Thanks!

#2 4 years ago

I had a similiar problem that was fixed by replacing a logic chip or two. I believe that they were ttl, 7400 series and located at the top of the board. If I can find in my repair logs I will give you more info. There is a pretty thorough troubleshooting guide out there, should be found by a google search. Good luck!

#3 4 years ago

Personally I feel like no sound on Nugent is an upgrade...

Has the SB-100 been re-capped? I would check voltages and probably start there.

Here is a link to a deep dive on the SB100, it may help.
http://www.techdose.com/projects/Stern-Pinball-SB100-Sound-Board/346/page1.html

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