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Title: Joust Power supply rebuild headaches Post by: Griffin 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. Title: Re: Joust Power supply rebuild headaches Post by: Griffin 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 :o
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 Title: Re: Joust Power supply rebuild headaches Post by: arcadefan1985 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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