Arcade Collecting > Restorations & repair
1975 Atari Crash 'N Score Restoration
ChadTower:
--- Quote from: RetroACTIVE on August 27, 2009, 10:50:17 am ---Pretty sure you are correct Chad... the big power transistor and filter caps on the pcb along with the transformer sitting all by itself are all pretty good indicators ;)
--- End quote ---
Heh, yeah, I took a look at the pic right after I posted that to make sure I was remembering correctly.
So, first approach would be to get that power supply section recapped, rebuild the bridge if it looks even a little toasty, and then look at the schematic to see what AC input you need. I wouldn't try to hack a PC power supply into there without knowing the board actually works first. Too many variables and places for those TTL chips to leak out just enough voltage to bring the whole game down weirdly.
BTW, if you need any info on rebuilding that monitor (it looks like a Motorola XM-501) find my Tank II thread. It's either in projects or restoration. There is a LOT of detail in there on that monitor including how to build a test adapter for powering it off the 110v from the wall and use a VCR as a known good input source.
RetroACTIVE:
.... and that big honkin' 10W wire-wound resistor ;)
ChadTower:
Yeah, let's just hope that sucker is still good. :laugh2:
Level42:
You lazy lot ;)
Yes, AC in all the way. And of course nice tropical voltages. 16,5 VAC and 25VAC.....
ChadTower:
You could definitely get away with something similar but not exact on those AC voltages. Just don't go too much higher or lower. IIRC on the Tank II those 16.5 get rectified and then regulated to 12 and maybe 5 and -5 DC. Anything within the tolerance of the regulators should be fine.
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