Re: DX7 Memory Corruption

"[email protected] [YamahaDX]" <[email protected]>
Newsgroups gmane.music.equipment.yamaha-dx
Message-ID <[email protected]> 
I had a very similar problem - I even sourced some replacement RAM chips as I thought they might be faulty but that wasn't the reason. It turned out that the contents of the RAM were being corrupted as the DX7 was powered off. There is a PD signal coming from the "DC" power board that is designed to prevent this but the Zener diode ZD1 (6.2V) had failed meaning the RAM could get written with random data.
 

 Hope this helps.
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