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Troubleshooting Pengo Power Supply

Spent a couple of hours tonight looking at the Pengo game and trying to do some troubleshooting, mostly on the liner power supply.

As you see in the photo below, this is what a Sega/Gremlin Linear Power Supply looks like fromt the front, with the PCB board mounted on the inside of the humongous heatsink.

Pengo Testing Power Supply Photo 1Pengo Testing Power Supply Photo 2Pengo Testing Power Supply Photo 3Pengo Testing Power Supply Photo 4

I had made contact with two different people who said to start by testing the Power Supply Voltages. The Power Supply in this machine is mounted awkwardly, so I just decided to unscrew it and get rid of some of zip ties. Most collectors like their games to be perfect and neat, right now, I just want to understand them and care little about that.

I took out the first two fuses and checked for continuity, and those seemed to be ok. (Those are the fuses on the left in the photo, just above where I indicated where the pot for controlling the voltages is at.) So, now time to check the voltages.

These second two photos above show the power connection for the 12V, 5V and Ground connections that supply the PCB. The 12V would be for the audio, and the 5V for the game board. I stuck my black lead into one of the ground, set my meter to 20V, and put my positive lead into each of the 5V and 12V connections, four tests in all.

For each 5V I read 5V exactly, and the same with the 12V, I read 12V exactly. So know that voltages can be dropped on the way to the board, I checked the voltages in the connector. Same thing, all of them right on the money which is weird, they usually fluctuate about .2 a volt. So, I decided to test right on the traces for the edge connector. I am going to point those places below, as well as the pinouts for this 44 (22×2) pin connector for the Pengo.

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Comments
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Just wondering if you continued to use original power supply after the switcher was installed? I’m looking for a pengo power supply… any thoughts?

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I took the old power supply for my Pengo out of the cab, it is sitting on a shelf.

You never answered me in the KLOV forums on the Pengo “What’s it worth”, did you get the Pengo from Craigslist in Chicago?

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