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Old 27 May 2023, 14:22   #21
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Originally Posted by Screechstar View Post
As a reference, when I measure resistance I get about 150ohm across the carbon pads that work for me. Even after a paper-rub, that one I removed is up at around 700ohms, so may need a more intrusive fix is needed for that, like conductive paint, pencil rub or something.
Paper rub probably not help to much, if thorough IPA cleaning not helping this then perhaps you can find some cheap PC keyboard as conductive rubber part donators. PC keyboards should share same design with Amiga.

This video may be helpful too [ Show youtube player ]
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Old 27 May 2023, 20:30   #22
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I've revived a totally dead C128 keyboard with only a blank piece of A4 paper and some compressed air. Done several other intermittent Mitsumi boards too, but the one with absolutely zero keys registering before the treatment was an amazing transformation.

I always use it first before making a mess with graphite or remote control paint.
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