[sdiy] Ensoniq keyboard calibration advice?

[Peter Pearson]

Oh nice.  Thank you!  I'd be interested if you want to message me off
list or whatever.  Are they official?  The keyboard schematics on the
Tauntek site have been helpful but I haven't made much progress after
looking at it more today.  I turned all the oscillator trims fully down and
I have the full keyboard working again except most of the keys drone like
crazy.  I'm hoping I can find the sweet spot but I can't measure the
oscillators' frequency with the keys in place and the frequency is
meaningless without the keys in place.

I've seen a service manual for the ASR10 but it's basically "if you have a
problem here, this is the board swap you need to do".  No mention of where
to set the trims.

It's a shame because I really like ensoniq gear but the lack of service
info sucks so bad.

On Fri, Jul 1, 2022 at 9:32 PM grant musictechnologiesgroup.com <
grant at musictechnologiesgroup.com> wrote:

> I have the schematics for the KPC HC11 board that you speak of. It's 1MB
> so I'm not sure everyone wants it email blasted. I had a spare KPC board
> way back when that I re-purposed into something or other for a local
> museum. No idea what that was but I probably have the HC11 assembler
> source somewhere...
>
> GB
>
>
> ------ Original Message ------
> From: "brianw" <brianw at audiobanshee.com>
> To: "Peter Pearson" <electrocontinuo at gmail.com>
> Cc: "synth-diy mailing list" <synth-diy at synth-diy.org>
> Sent: 7/1/2022 4:32:19 PM
> Subject: Re: [sdiy] Ensoniq keyboard calibration advice?
>
> >Oh!
> >
> >I didn't realize that the ASR-10 is a couple of years newer than the VFX.
> This is probably because I got my ASR-10R directly from Ensoniq when it was
> brand new (subsequently stolen from me) and then I got my VFX many years
> later, used. I had assumed that *all* of the Ensoniq PolyAT keyboards used
> the same KPC circuit board mounted under the keyboard, with socketed 68HC11
> processor and EPROM (plus maybe a few more).
> >
> >Are there any ASR-10 schematics around?
> >
> >Brian
> >
> >
> >On Jul 1, 2022, at 3:25 PM, Peter Pearson <electrocontinuo at gmail.com>
> wrote:
> >>  Hi Brian.  I know what you're talking about with the EPS keyboard.
> The ASR10 keyboard I'm looking at is mostly surface mount and nothing is
> socketed.  The 2 keyboard PCBs have a ribbon cable between them.  I already
> cleaned and resoldered the connectors between the boards.  Feel you on the
> back sockets and oxidized pins though.  Very annoying when you come across
> that.
> >>
> >>  On Fri, Jul 1, 2022 at 4:58 PM brianw <brianw at audiobanshee.com> wrote:
> >>>  I have no reason to doubt your statement, but...
> >>>
> >>>  Considering that I purchased my EPS new in 1988, I'm not exactly
> disappointed that some oxidization (or whatever happens to old socketed
> chips) had to be broken free after three decades. I didn't think I was
> buying military-grade equipment, and even military-grade equipment requires
> frequent maintenance for continued reliability.
> >>>
> >>>  At least it's not like the Apple /// ... where chips literally fell
> out of their sockets and the product stopped working.
> >>>
> >>>  Brian
> >>>
> >>>
> >>>  On Jul 1, 2022, at 9:29 AM, Rainer Buchty <rainer at buchty.net> wrote:
> >>>  > On Thu, 30 Jun 2022, brianw wrote:
> >>>  >> Have you tried gently removing the main chip and then plugging it
> in again?
> >>>  >
> >>>  > Definitely good advice on Ensoniq gear. They used quite some crappy
> DIL/DIP sockets.
> >>>  >
> >>>  > Rainer
> >>>  >
> >>>
> >>
> >
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