48 in 1 speaker squeal

shardian

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I sold a pacman cocktail multicade with a 48 in 1 board in it to a guy 2 weeks ago. It worked perfectly fine in my house for 2 days being on for a few hours at a time.

Dude calls me a few days after he has it home, and says the speaker is squealing. I heard it on the voicemail, and it is a kind of high pitched squeal.

The thing that throws me off guard is that he says it doesn't start doing it until the game has been on for 5 minutes or so.
I've had him reseat the jamma connector with no effect.

Has anyone ever encountered this issue? I had a light squeal on my 48/1 Xevious, but it was because the connector was loose. Like I said, the delay really throws me off. This evening I started thinking maybe the monitor or power supply are making the sound. It came through pretty loud over the phone though, and I don't think a monitor or PS would come through that loud from a closed cocktail. He seems pretty sure it is coming from the speaker anyways. I just don't know what could have changed from my house to his...

Any ideas? I really don't want to make the 1 hour trip up there...
 
Is the squeal tied to any particular game? The sound emulation on some of thsoe games is terrible. And the word "squeal" makes me think loose/vibrating flyback. I'm assuming it didn't sound like that?
 
Is there an off-board volume control? Does the squeal get louder or softer when it is turned? If no off-board volume control, have him try turning the on-board volume pot.

If the squeal changes with the volume control, then it is from the speaker. If not, then it's most likely the monitor or power supply. I've heard some power supply squeals get pretty loud. And I think that cab had a fan in the bottom that might be making the squeal.

Also, ask him if he's moved it recently. If so, then it's possible a connector is a little loose....
 
I had a 39-1 that made a constant noise through the speaker from the get go. Was noise off the supply. I want to say it cycled. Was not constant. That was well over a year ago...I do good to recall yesterday!!! We built the game with a used supply. Put in a new one and all was good.
 
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