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    Adjusting focus (R57) on an international Mac Plus analog board does nothing

    I have an international Mac Plus with a very blurry screen towards the edges. Center pixels seem okayish. When I adjust the R57 pot meter (focus) nothing happens on the display. Using my multimeter I can confirm that the pot meter varies resistance between about 0 to 2M ohm, so it seems to be...
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    Mac Plus 240v Analog board CR21 diode

    Hi folks, I've got a Mac Plus international analog board here with a blackened CR21 diode. When measured it has about 40 ohms resistance regardless of polarity. This is a good indication this diode has blown right? Should I get a replacement and try again or could there be something else at...
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    MacPlus analog board with resistor on the back

    Hi, I've recently acquired two mac plusses which I'd like to restore to proper working condition. I've found a resistor on the back of one of the analog boards which looks very odd to me. Somebody has definitely been inside the machines before me, so I was wondering if this factory default for...
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