Potemkyn Posted February 16, 2021 Share Posted February 16, 2021 I may have a bad power supply that fried two of my 800 XLs. I checked the output last night and three of those blocks are putting out 5VAC, while a fourth is putting out 7.5VAC. I have another PS that is the vented type (somewhere), that I can hook up to them and test once more. IF this problem persists, is there a solution? Mike Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted February 16, 2021 Share Posted February 16, 2021 14 minutes ago, Potemkyn said: IF this problem persists, is there a solution? There’s always a solution. The level of effort required will depend on your own experience with working on vintage electronics, your tools available, and whether the board in question is socketed. Chances are you’ve damaged at least one IC but which one(s) can be easy or tricky to figure out. Start by powering the board with a good PSU and seeing if any of the chips get super hot. SALLY, GTIA and to a lesser extent ANTIC get pretty warm but never “hot.” The rest of the chips should never get very warm at all, usually. If you have a scope or at least a logic probe, the schematics and logic charts in SAM’S ComputerFacts can get you going straight away. Quote Link to comment Share on other sites More sharing options...
Potemkyn Posted February 16, 2021 Author Share Posted February 16, 2021 Used to have a Logic Probe, currently only have a Multi Meter. Once I find the other power supply, I'll check it's outputs and then get started on some T/S. I'll post updates here. Quote Link to comment Share on other sites More sharing options...
bfollowell Posted February 17, 2021 Share Posted February 17, 2021 9 hours ago, Potemkyn said: I may have a bad power supply that fried two of my 800 XLs. I checked the output last night and three of those blocks are putting out 5VAC, while a fourth is putting out 7.5VAC. I have another PS that is the vented type (somewhere), that I can hook up to them and test once more. IF this problem persists, is there a solution? Mike What "blocks" are you referring to? The output of the 800XL ends in a 7-pin DIN with three pins on one side all shorted together to +5VDC one that's not connected to anything and the other three pins all shorted to ground. So, assuming your DIN connector isn't broken, you can really only have one voltage, regardless of what it is reading. Are you referring to something actually inside the PSU itself? Which PSU do you have? Quote Link to comment Share on other sites More sharing options...
Potemkyn Posted February 17, 2021 Author Share Posted February 17, 2021 @bfollowell Oh, the SEALED Power Supplies... I have a Vented PS, but have not yet come across it. Quote Link to comment Share on other sites More sharing options...
bfollowell Posted February 17, 2021 Share Posted February 17, 2021 OK, so you're referring to something actually inside the PSU itself. Gotcha. Quote Link to comment Share on other sites More sharing options...
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