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From another user, whom I want to thank: Before declaring the CPU dead, check with the oscilloscope that the clock and the reset signal are generated correctly. Looking at the diagrams we see that the clock is generated by IC3 (an LS74) and the reset comes out of IC4 which is a 3 pin M51951, similar ...

I thought you may be interested to hear my experiences with my faulty Korg M1 as we discussed a few months ago? You may remember I thought the main board was faulty and I ended up finding one on ebay for a reasonable price, from a fellow countryman of yours in fact. On fitting the new board the ...

This request is addressed to all the "technicians" who have ever "put their hand" to their Korg M1 or similar (T1 / T3 Series). Last week I turned my Korg M1 back on after more than a year. At the first start the screen presented a freezed boot text (I don't remember the content well but something ...