[sdiy] DX7 Memory Problem

[gregory zifcak]

That's what I'm figuring, just wanted to see if anyone has experienced this particular behavior. I'm not familiar enough with digital to know if it's easy to pinpoint it at the RAM or if it could be further up the chain.
Thanks,
Greg
----------------------------------------
> From: synth1 at airmail.net
> To: zifcak at hotmail.com; synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] DX7 Memory Problem
> Date: Sat, 18 Aug 2012 17:02:56 -0500
>
> 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,
> Greg
>
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