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Author Topic: Joust Power supply rebuild headaches  (Read 2513 times)
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Griffin
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« on: April 03, 2014, 01:55:25 pm »

OK, my first real post here, let's see if it's a good one.

Bought a working Joust for my wife, got it home, it played for 45 mins and then the power supply went poof, not entirely surprising as it had been in storage for 2 years and doesn't look like it has been looked after very well.

I was getting LED #2 and #3 lit on the power board but not #1 for the +5V.

Bought a Bob Roberts deluxe Williams PS rebuild kit and replaced everything including re-pinned connectors and both transistors on the heat sink except for the header pins, only because I don't have a de-soldering system meaty enough to get them off.

Now on power up I get LED #1 and +5V at the ROM board with a 1.3.1 error but I don't have LED #2 or #3 lit. All fuses are new. Haven't spent much more time on it than that so far. WOndering what to test next.
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Griffin
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« Reply #1 on: April 04, 2014, 12:22:22 pm »

Got the supply working after finding some of the pins in the wiring harness were in the wrong location  Shocked

Now I'm down to RAM errors on the board. most likely due to +5v voltage drop. Going to reflow headers on the MPU and try the 5k pot voltage hack on the power board so I can actually adjust the output volts and get a good 5.1v to the RAM
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arcadefan1985
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« Reply #2 on: April 05, 2014, 09:13:10 am »

What's the voltages at the test points on the psu board. Especially the one in the middle of the board, I think it's TS-5.
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