Macintosh Plus capacitor troubleshooting wih some heat
UPDATE: Try heating the U3 optoisolator, it was bad on mine!
Some time ago I did the same procedure to troubleshoot a Mac LC PSU, well, I am happy to report that it works on Plus’s as well!
it is not a permanent fix, but it is very useful when the machine makes that flub-flub-flub ticking noise and you are not sure if the flyback or the transformers are ok
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macintosh
