[sdiy] DX7 Memory Problem

Paul Schreiber synth1 at airmail.net
Sun Aug 19 00:02:56 CEST 2012

You have 25-30yr old CMOS memory chips. They are probably bad, or a buffer
driving them is bad.

This stuff doesn't last forever :)

Paul S.

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of gregory zifcak
Sent: Saturday, August 18, 2012 4:46 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] DX7 Memory Problem

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,
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