Genesis
Gottlieb, 1986hi 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....
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.
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!!!
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
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.
Quoted from thedefog:tda2002/2003
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
Quoted from barakandl:i think i see two LM324 op amps.
thanks , I'll try to change the 2 X OP amp 
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.
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
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
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