Paperboy 5V 3A DC Power Supply

modessitt

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Well, this dead Paperboy I'm working on is showing signs of coming out of the coma. Rebuilt the ARIII and now ave my missing voltage back. Pulled the monitor chassis and fixed all the bad solder underneath and it's up and running (still needs to be capped), and now my next problem.

When I powered it up, I immediately started getting smoke coming from that little DC power supply on the right inside wall. Voltage going in is correct. Pulled it and at least two diodes are shorted out. Unfortunately, the manual and the schematic package do not include a schematic for this. (I have hard copies of both and I doublechecked the online version, too)

Looking at the wiring diagram, it appears to just have 120vac in, and +5 and +5 Ret (ground) out to the CPU board. Any reason why I can't just stick a nice and new switcher in there in its place? I'm hoping there isn't a short on the CPU board somewhere that caused it to blow up, but when I had the CPU running only (without the video board or monitor) it wasn't smoking. Might just have died from age and all the dust that was on it.

A switcher looks pretty easy to install. Guess I could do it as a test anyway to see if i can get the game to come up...
 
Mine is the same way. I have a switcher that only has the 5V wires hooked up to the wires where the 5V power source used to be on the side of the cabinet.
 
Thanks, Ken, but after looking through them, I didn't see what I needed. They show me the inputs and outputs to it, but don't show me the actual inner workings.

That first link is for a different power supply than this one.

I went ahead and put in a switcher and it's fine. Apparently, when I rebuilt the ARIII, I skipped replacing the LM305, and right now it's putting out 7.3 on the 5v line. I'm going to go replace that here in a bit, and see if the game will come up or not. I'm not hopeful at this point...
 
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