[sdiy] Ensoniq Esq-1 main board question

Rutger Vlek rutgervlek at gmail.com
Fri Jun 26 18:56:00 CEST 2020


Also make sure you check the DAC. I've had a esq1 with the exact same
symtoms due to a failing DAC.

Op vr 26 jun. 2020 17:50 schreef Mark G via Synth-diy <
synth-diy at synth-diy.org>:

> Thanks for the advice, I will focus first on those areas, and ask around
> and see if anyone that I know has an ESQ-1 that I can part swap with.
>
> Mark
>
>
>
> -----Original Message-----
> From: Mikko Helin <maohelin at gmail.com>
> To: Mark G <mratx at aol.com>
> Cc: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
> Sent: Thu, Jun 25, 2020 5:13 pm
> Subject: Re: [sdiy] Ensoniq Esq-1 main board question
>
> 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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