(Topic ID: 285718)

What are these on the sound board.


By Capt_Pinball

5 days ago



Topic Stats

  • 8 posts
  • 7 Pinsiders participating
  • Latest reply 5 days ago by ChrisHibler
  • Topic is favorited by 2 Pinsiders

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#1 5 days ago

Hello all I have a tspp and it has these clipped on the sound board the blue electronic piece held by the black clips. If there not on there correctly my pin sound goes haywire. can you tell me what these are and can i take them off.
Thanks

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#2 5 days ago

THat bottom resister looks burnt ?
Is it possible they're both bad and someone did a repair by adding resistors over them instead of soldering them in ?
If you have a dmm, disconnect the hooks and try to measure the resistor they're over if it still has the correct value ?

#3 5 days ago

Those blue squares are adjustable resistors known as pots. They would be used on a sound board to change the output volume of the speech or background sounds. You can remove them with out issue. Someone wanted adjustability without making it permanent.

#4 5 days ago

Wasn't there actually a thread on Pinside talking specifically about this mod several months back?

#5 5 days ago

Maybe but I didn't see it.

#6 5 days ago
Quoted from Capt_Pinball:

sound goes haywire

What do you mean? Can you describe what exactly happens? Or possibly record a video, if that's easier?

#7 5 days ago

That is a mod to lower the gain of the amplifiers. The stock amp gain on some Sega and early late model Sterns (right after they bought Sega) was set high (so presumably the sound could get loud enough in an arcade) and they exhibit buzzing sound from the speakers at idle. This buzzing is very noticeable in the quiet home environment. Reducing the amp gain lowered the buzzing so it isn't as annoying.

https://groups.google.com/g/rec.games.pinball/c/RiqCixRjptI/m/c3jTUzOgqdYJ

#8 5 days ago

I have this in the PinWiki...but I never found a picture.
capt_pinball, Can I use your picture?

Someone made a more professional looking mod that did exactly the same thing.
I changes the resistance value of two resistors.
See: https://www.pinwiki.com/wiki/index.php?title=Sega/Stern_White_Star_Repair#Loud_Hum_and.2For_Distortion_at_Low_Sound_Levels
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

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