QUICK TIP: Testing and adjusting the voltage on a compact Macintosh

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The Macintosh 128K, Macintosh 512K, Macintosh Plus, Macintosh Classic and Macintosh Classic II all have an adjustable power supply. This video explains how to test the voltage output of these Macs, as well as how to make minor adjustments.
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#RetroComputing #MacPlus #Macintosh #VintageMacintosh
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[@GarthBeagle]

8:03 "... lots of nasty zappy dangers in there" ⚡️

[@JeremyBolanos]

Very informative!

[@TheHouseOfMoth]

Good stuff!

[@DavidStahlOLDHAPPyMACs]

Great Tip Bruce good info

[@jimboblivesforever]

While this is basically a multimeter commercial, It's still very informative, and I do enjoy your edited short-form videos a lot. Thumbs up!

[@RudysRetroIntel]

Excellent video and explanation!

[@threethousandyen]

Great info for beginners to check a common failure point! You do a good job of underscoring how dangerous this can be, especially with the Classic. I think since this is aimed at people who might not know what they’re doing it’d be best to say to ONLY use insulated or nylon tools for these adjustments. Especially with the Classic, it’s easy enough to slip if you’re nervous. I see you 3D printed a plastic handle, but most viewers won’t have that. There are reasonably priced insulated drivers on Amazon. I wish there were longer nylon TV adjustment tools but haven’t come across them. Cheers!

[@aa-au]

Great video Bruce. I want more!

[@dido1803]

Hi there. I really enjoyed seeing this video and learned a lot. A question regarding to adjusting V, is there a symbol that I should look for to know what component that is for adjusting V?

[@kenvanmersbergen4860]

Where can we get that 3d printed extender?

[@Scarlet_1971_cuda]

You cover the +12v acceptable voltage levels but not how to adjust the +12v rail. I assume that only the +5v rail is adjustable. Is this accurate?

[@BranchusCreations]

Check out the caveats I mention at 02:35. The adjustment will affect *both* the +5 and +12V rails. If you get the +5V correct but +12V is outside of acceptable range, you have issues that are beyond an adjustment.

[@kmichielsen]

@@BranchusCreations I have a Mac Plus that is giving me the Jail Bars and no chime, I tried troubleshooting the RAM/ROM but I don't have any known good units to test with. I did check the voltage and I was almost getting 5V but im only get 3V on pin 8. What would be my next best course of action? Is this an analog board issue? Thanks in advance for any advice