Installing a 5k Vol. Pot centipede with JAMMA adaptor making a speaker hum

GunSmoke Guy

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Installing a 5k Vol. Pot centipede with JAMMA adaptor making a speaker hum

OK, so I have my centipede up and running, and It's wired JAMMA using a centipede to JAMMA adaptor, (I see on the adaptor it has a vol. control) All of the controls are working properly / buttons.. and also I have sound but my speaker is making a terribly loud humming / buzzing noise. I read somewhere that I can install a 5k vol. pot. to resolve this issue ?

would this be sufficient ? http://www.radioshack.com/product/index.jsp?productId=2062356

If It's sufficient, what exactly do I need to do to wire it up correctly, I have the speaker wires coming from the JAMMA harness, and it's currently connected directly to the speaker wires that go to the speaker. I'm guessing one of the metal tabs is for ground on the 5k pot and one is for Left / Right Audio, but I'm still confused about installing it properly. Any help would be appreciated.
 
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ok so after some more testing, and installing the 5k pot... I took the centipede board out of the cabinet, replaced it with another random JAMMA pcb, and I didn't have any sound Issues.. no speaker humm, sounded fine.. so I know everything is wired properly.

Which leaves me to believe that it's related to the Y-PLUS Technologies centipede to JAMMA adaptor.

On the adaptor I noticed the LM380N chip is HOT as hell.. not sure if it's supposed to be.. I'm not sure if any one else is using a centipede to JAMMA adaptor in a cab, but can you recommend an alternative to the most likely defective Y-PLUS one that I have ?

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check the pinouts

if the chip is getting hot and causing feedback, something isnt right

using a schematic, double check every wire, pin and connector going in and out of that unit



by the way, i used to live on 84th and riverside. where are you in the big city ?
 
i'm having the same exact problem with mine...same set up, same hot chip,same hum...and my volume is either hardly audible or it's really too loud, no happy medium
 
by the way, i used to live on 84th and riverside. where are you in the big city ?

actually live on Long Island, I know I should probably change that... thought I did a while ago.


mudhens1: i'm having the same exact problem with mine...same set up, same hot chip,same hum...and my volume is either hardly audible or it's really too loud, no happy medium

I think it's the adaptor is just made poorly, since I've tested other JAMMA games in that cabinet without it which don't have audio issue. Bottom line is I think I'm going to either wire it using an original harness or I need a different JAMMA adaptor. Can any one loan me an alternative one so I can test it, I'll pay shipping both ways.
 
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