Re: PINBOT Loud Humming Buzzing Sound from Speakers

On Sep 29, 11:14 am, Arizona Bruce <bruce9...@xxxxxxx> wrote:
If floating the card didn't work or replacing the gound plug on your
power cord didn't fix it try....

CORRECTION... Not Ribbon cable... J1 on Sound Card

Disconect the XXXXXXXXXXX that  runs between the sound board and the
CPU to determine if the hum is coming from the CPU (Since have the
sound is there too) If the hum goes away look a the elctrolytic caps
on the CPU at locations C2, C3, C24, C26, C29... Look for buldging on
the  tops of the  caps or leaking goo on the bottom of the caps by the
board... Those are safty releases to keep the caps from exploding...

If disconecting the ribbon cable makes no change then look at all
electrolytic caps on the Sound board for buldging or leaking... (too
many locations to list) You can tell the electrolytics they look like
a barrel... Two types Radial standing tall and axial on their sides
with wires coming out each end...

I'd guess you have a bad isolation capacitor... It's purpose is
exactly that... to clean the siganl prior to the next stage of
amplification...

ArizonaPinball will be coming online in about a month with  awesome
mods, upgrades and services one of which  is a complete recapping
service using audio grade  polypropolene capacitors, metalized
resistors and on-board amplifiers upgrades... so not only would it
likey fix this type of problem but substantially improve the quality
of sound... More announcements coming soon...

Arizona Bruce
AZB
Arizona Pinball

.

Relevant Pages

  • Re: I Call For A Lynching
    ... Of course isolation transformers aren't particuluarly expensive, ... the unit and making a similar claim has no sound technical basis IMO. ... even I do use different types of capacitors and cables in my ... As far as caps go, there are sound reasons why caps in the signal ...
    (rec.audio.opinion)
  • Re: PINBOT Loud Humming Buzzing Sound from Speakers
    ... CPU to determine if the hum is coming from the CPU (Since have the ... sound is there too) If the hum goes away look a the elctrolytic caps ... electrolytic caps on the Sound board for buldging or leaking... ...
    (rec.games.pinball)
  • Re: best paper foil and oil for homemade caps?
    ... as coupling caps are plastic film types using polyester, ... faulty, they all sound identical, and not color the sound ... difference between tubes and solid state and which tube amp ... at all...that simply don't impinge on our consciousness. ...
    (rec.audio.tubes)
  • Re: Teflon Film Tin Foil capacitors, and Auricaps or others
    ... begin to increase the quality of the sound in subjective ways. ... the "better" caps were or not, ... If I plug your ears with wax, and then test to see if you hear a difference between amps or speakers, would you consider that to be a valid test? ... They found the issue of the STANDARD AB-test confusing, because on the one hand they got your results -- caps A and B could not be distinguished in a normal AB test -- and yet another type of double-blind test, which automatically occured when they changed from using cap A to cap B in their amps without telling anyone, frequently resulted in a ton of letters saying how much the amp's sound had changed. ...
    (rec.audio.tubes)
  • Re: PINBOT Loud Humming Buzzing Sound from Speakers
    ... CPU to determine if the hum is coming from the CPU (Since have the ... sound is there too) If the hum goes away look a the elctrolytic caps ... electrolytic caps on the Sound board for buldging or leaking... ...
    (rec.games.pinball)