[sdiy] Odd MKS-70 Behaviour....

[greg montalbano]

For what it's worth, when I was dealing with this problem on one of my P5s 
with a faulty power supply, the damage also had a kind of "surgical 
precision" -- the same presets would be damaged every time (and the other 
presets were always ok).

~GMM

At 09:55 AM 2/4/04 -0600, David wrote:
> > From: Gavin Muir [mailto:gmuir at sympatico.ca]
> >       One thing I did notice in the power supply is that
> > there is an EMI
> > board on the mains input, which could play into the spike theory, but
> > again, it's a spike with surgical precision if it is!!!
>
>Actually, I think that's plausible... The MKS-70 was
>a mid-80s design.  Thinking back a bit, the generation
>just before that (J106, etc.) didn't remember their
>MIDI parameters at all; everything was either set by
>hard-wired switches/jumpers, or had to be set at every
>power up.  I'm guessing that on the JX series, they may
>have put the MIDI parameters into a RAM separate from the
>patch RAM, and if that RAM is a different type, it may
>be more sensitive to power spikes.  Just a theory.