[sdiy] DX7 Memory Problem

[gregory zifcak]

Hi all,
I have a DX7 II that all of a sudden stopped saving patches. I was in the middle of sequencing it when all the patches disappeared and I can no longer save anything, or dump via sysex. I can still program in the edit buffer, and this gets retained on power down. Battery voltage is healthy. 
I replaced the battery when I first got it about a year ago and it was working perfectly until this problem appeared.

At one point even the patch I was working on started to degrade into seemingly random settings. I don't really have experience with digital electronics, but I'm guessing this may have something to do with the RAM chips? I don't know why this would cause the edit buffer to degrade though.


Thanks in advance for any tips,
Greg