[sdiy] Ensoniq Esq-1 main board question

[Mark G]

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 reseating 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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