Patches and discussion for Ensoniq VFX family

On Wed, Mar 9, 2005 at 9:00:41AM -0600, Dennis Smith wrote:
> ... I have had the "Calibration Problem" with my VFXSD that has been
> factory upgraded to an SD-1 in 1994...   the factory had done the
> hard wire when they upgraded it. Well, this is actually good news,
> because,when I unplugged the keyboard from the unit via the ribbon
> cable, I noticed a little corrosion on the pins. I cleaned these off
> and blew the dirt out of the unit and when I put it back together,
> it calibrated perfectly!! 

This matches my experience, a few years ago now, buying a used VFX-SD
that was exhibiting the symptoms of the keyboard problem -- not so
much the calibration failure, but the occasional extra notes from
nowhere and such.  The seller was not sure if the keyboard fix had
been done, and was selling at a pretty good discount because of the
problems.  So I took a gamble and bought it.

When I received it, I first powered it on to make sure I had the same
problems the seller did -- who knows, shiping might have "fixed"
something, and I also find it's important to know how to reliably
cause a problem in order to know you've actually fixed it after
working on it.  Sure enough, the problems were there.

I opened it up, and to my dismay, the keyboard fix HAD been done on
the unit.  However, I re-flowed the solder joints for the keyboard
fix, and cleaned the other connectors (between keyboard and main CPU
board) a bit, and I haven't had problem one since!

--> Steve Wahl