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Old 12th Oct 2021, 7:05 pm   #286
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 8,234
Default Re: Sharp MZ-80K help needed on repair

Sorry, I think maybe my terminology leaves something to be desired - for me a digital 'waveform' is any signal which has a mixture of high parts and low parts in it, not necessarily 50-50 high-low like the ones you saw on the address lines in the NOP test.

The pulses you see (when you alter the time / div) need to look nice and sharp and square, not buckled or rounded.

What about the H-Hold control on the CRT display, can you get to that to try adjusting it a little?
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