Make Trax No Sound

Hammerheadx

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My Make Trax has been working flawlessly for some time, but now when I turn it on I no longer have any sound. As best I can tell the culprits could be:

volume pot
sound amp
sound waveform rom
sound timing rom

Where should I start looking to try to diagnose the issue?
 
I had to fix one of these with gamefixer. or I identified the problem and he fixed it. I've blocked a lot of that period out of memory, but I think the amps are what go bad. if you quote reply me back to remind me I can text him about it later.
 
I had to fix one of these with gamefixer. or I identified the problem and he fixed it. I've blocked a lot of that period out of memory, but I think the amps are what go bad. if you quote reply me back to remind me I can text him about it later.

Hey @mecha just replying to your message. Not sure where I could source an MB3712 amp IC, I've only seen one on eBay, but its in Greece. It would cost more to ship than the chip itself.

Steve
 
Probably the amplifier. I've had to replace a few. If I recall, the board was made to support two different models and one is available.

~Brad
 
I'd make an audio probe (easy to find parts) and probe the audio circuit starting from the AUDIO pin of the edge connector backwards into the analog section, up to the D/A converter. For example, if you get audio IN the amplifier and no audio OUT (and voltages are good), I'd suspect the amp is bad.

p

1747653647789.jpeg
 
I had a note in my parts inventory that amplifier: LA4422 could be used. Seems they are available.

~Brad
 
Where would I source 1M or 3M?
In my experience PROMs are pretty tough and don't go bad. But anything is possible. I'd still look to other stuff first, as they are expensive, and hard to find. Are you able to read/dump them to verify if they are good? That would be a lot better than just replacing them. If you don't have an EPROM burner to check them, know any one local to you who does?
 
I would try my suggestion on my post #6. It's a simple path, it should take you a few minutes to troubleshoot. I would also look for bad capacitors and/or broken traces in the audio path.

p
 
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