Re: Sharp MZ-80K help needed on repair
To determine whether you have a keyboard problem or a keyboard circuit problem, first thing to do is to unplug the keyboard from the motherboard and use a short wire link to connect any of the keyboard connector pins 1-8 to any of pins 9-18. If the keyboard circuit is working you should be able to 'type' characters by joining pairs of pins together. If you find that this is working you could write or make a table of which pairs of pins 'type' which characters - some of them won't be obvious, like SHIFT which doesn't do anything by itself.
Don't connect any of the pins in the 9-18 range to each other though, could damage IC6.
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