(Topic ID: 121185)

Genesis bad audio after 5min play


By k0balt

4 years ago



Topic Stats

  • 13 posts
  • 5 Pinsiders participating
  • Latest reply 4 years ago by thedefog
  • No one calls this topic a favorite

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#1 4 years ago

hi please can some one help me with an audio problem on gottlieb genesis?

when i turn on the pinball audio is good, but after 5 minute of play the sound turn bad begini to be noisy scratchy.when i turn off and immediatly on the pinball the sound remain bad.
If i turn the pinball off and wait some minute, before turn on and play again the audio is ok.
i think some component become hot but i can't find where

realy sorry for the bad english ....i hope some one understand wath i mean....

#2 4 years ago

likely to be caps or amplifiers

in my experience, your symptoms sound like a failing amplifier. I see them with this failure mode often. They work for a few minutes and once they warm up sound gets distorted with lots of junk noise.

#3 4 years ago

I had the same problem. I sent my borads to the infamous Clive at "Coin'op Caldron"!

http://webpages.charter.net/coinopcauldron/brepairs.html

He fixed them good as new!!!

#4 4 years ago

Feel the heat sync on the amp(s).
See if they are really, really hot when the problem occurs.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWki.com - The Place to go for Pinball Repair Info

#5 4 years ago

I replacement tda2002/2003 will run you all of a dollar. That is most likely the audio amp it uses. Worth replacing audio filter caps as well.

#6 4 years ago

hi, i think this board do not mount TDA2002 i can't find it
this is the sound card model

http://pinwiki.com/wiki/index.php?title=Gottlieb_System_80#System_80B_Sound_Board_.28two_button.29

#7 4 years ago

i think i see two LM324 op amps.

#8 4 years ago
Quoted from barakandl:

i think i see two LM324 op amps.

thanks , I'll try to change the 2 X OP amp

#9 4 years ago

It didnt make sense there wasnt another main amplifier.

Turns out they put that sound amp on a different board... DERP! Look on page 31 of the PDF i just sent you. There is a TDA2002 amp on the Aux power board. I would suspect that amp before the LM324.

You can use a TDA2003 as a replacement.

#10 4 years ago
Quoted from k0balt:

thanks , I'll try to change the 2 X OP amp

You really need to slow down.
Gottlieb System 3 boards are delicate, and the ICs seem to be jammed into the through holes, making removal without damaging the board a job left to pros.

As baraka said, the amp is on the aux board.nfo
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair I

#11 4 years ago
Quoted from ChrisHibler:

Gottlieb System 3 boards are delicate, and the ICs seem to be jammed into the through holes, making removal without damaging the board a job left to pros.

i am good in soldering, socketted a lot of IC. i do that for work a lot

thanks

#12 4 years ago

also my stargate mobo has socket now

#13 4 years ago

Pop a tda2003 in there instead of a tda2002. It has better specs and is pin for pin compatible with the same current draw. it has protection for failure in it (auto shut off on over heat) as well as an additional couple watts. I replace all TDA2002s with 2003s.

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