[sdiy] Ensoniq Esq-1 main board question

Mikko Helin maohelin at gmail.com
Thu Jun 25 23:26:41 CEST 2020

Seems this seller has the keyboard controller chip, or the page just
haven't been updated recently:

On Fri, Jun 26, 2020 at 12:13 AM Mikko Helin <maohelin at gmail.com> wrote:

> Usual problems with ESQ-1 are ROM chips (available), corrosion in ribbon
> connectors and broken display or keyboard controller. Unfortunately that
> keyboard controller chip (Keyboard controller 1380 65002 / R1120-12) is
> unavailable, some other parts are available. It would help if you could
> swap parts like the keyboard ctrl from your ESQ to a working one one by one.
> On Thu, Jun 25, 2020 at 10:23 PM Mark G via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>> Hi, I have an Ensoniq ESQ-1 (metal case) that has decided it no longer
>> wants to turn on, it shows a brief flicker on the display but that's it, no
>> sound, no display, no response to any buttons. I went through the service
>> manual, and verified that the display self test works, and the power supply
>> voltages are all good. Performed the hard reset with no results. Tried rese
>> ating the socketed chips and cable connections, nothing.  The manual at
>> this point is no help, as it just instructs you to replace the main board.  I
>> acquired copies of the schematics from buchty.net, but the ones of the
>> main board circuits are not great quality so some things are hard to
>> read, which makes troubleshooting more difficult.
>> Does anyone have any knowledge of common main board issues that I can
>> check, or any tips?  I'd prefer to repair the board that I have if possible,
>> especially since replacements seem to be hard to come by. Any help would be
>> greatly appreciated!
>> Thanks,
>> Mark
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