[sdiy] DX7s failed recovery after dead battery

[Rutger Vlek]

Thanks! I tried that, but this doesn't work on this dx7. I can enter a
testmode with the edit button and 16 and 32 pressed at the same time, But
no cure there either

Op 19 mrt. 2017 11:03 schreef "Mattsson Per" <per.mattsson at miun.se>:

> Maybe you should try a factory reset?
>
> http://faq.yamaha.com/us/en/article/musical-instruments/
> keyboards/synthesizers/dx7s/723/2354/Factory_Reset_Procedure
>
>
>
> Skickat från min iPhone
>
> 19 mars 2017 kl. 10:27 skrev Rutger Vlek <rutgervlek at gmail.com>:
>
> Dear all,
>
> I'm hoping for a little inspiration and/or expertise from someone here, as
> I ran into a strange problem with a Yamaha DX7s (yes the S version).
>
> It displayed a dead battery sign, and I've replaced the battery with a
> fresh one. The message is gone, and it boots correctly. Of course the
> original memory content was scrambled due to the lack of battery power, so
> I tried uploading new patches via Sysex. I've tried many different ways of
> doing this, and the synth receives them, stores them to memory, and I hear
> differences in the sounds that I can recall. However, all patches suffer
> from the same problem. A huge amount of vibrato is added, and pitch scaling
> over the keyboard is often out of tune or randomized. I tried manually
> programming a patch (in the memory buffer, didn't try storing it yet), and
> this worked fine. I tried modifying the loaded patches and found strange
> parameter values for some modulation indeces that caused the vibrato and
> key scaling to be off. I found values of 15 where my slide and buttons only
> allow me to enter up to values of 12! Clearly, something goes wrong in
> receiving the SysEx and putting it !
> to memory, but I can't figure out what.
>
> I tried 3 different programs, from a plain SysEx dumper to a more fancy DX
> editor/librarian. I tried from both Windows and Mac machines. I tried
> through 2 different midi interfaces (both MOTU). I tried various sources on
> the internet for the SysEx files, at least 5 different sources. So I'm
> beginning to think it's an internal problem, and nothing to do with the
> Sysex itself.
>
> Other MIDI messages are received correctly (e.g. note on/off, controllers,
> etc).
>
> Any ideas?
>
> Best,
>
> Rutger
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