(Topic ID: 38023)

J114 pics req? Odd hack: separate happ power supply in the cabinet...

By Mocean

11 years ago


Topic Heartbeat

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  • 23 posts
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  • Latest reply 2 years ago by zhu808
  • Topic is favorited by 2 Pinsiders

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#11 11 years ago

Well that's one way to have a stable 5V to the CPU and no reset.....

That looks like a JAMMA power supply and some have an adjustable 5V pot on them. The game likely had a reset issue and that was "the fix".

I have a nice Road Show and it was the one game I almost lost my mind fixing. I purchased my machine not working with a known reset issue. No problem. Nothing hacked up and the boards looked clean. In my case it was a combo of the thermistor in the power box, the infamous "Z" connector and standard bridges and caps.

The part that made me want to torch it is I had multiple solenoids firing randomly and I socketed and replaced U4 (I think) and figured I nailed it. Nope. I spent a LOT of time tracing wires and logic probing legs of chips until I found the real problem. There was a bridged data line that ran under U1 from a piece of small wire or solder blob that made intermittent contact.

Its easier for a bad component to burn up or not work at all and the random problems will drive you nuts. The fix was cheap but the time to catch it was a long one!

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