[sdiy] Ensoniq keyboard calibration advice?

[brianw]

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
>> > 
>> 
>