<div dir="auto">Also make sure you check the DAC. I've had a esq1 with the exact same symtoms due to a failing DAC. </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Op vr 26 jun. 2020 17:50 schreef Mark G via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Th<font size="2">anks 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.</font></div>
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<div><font size="2">Mark <br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Mikko Helin <<a href="mailto:maohelin@gmail.com" target="_blank" rel="noreferrer">maohelin@gmail.com</a>><br>
To: Mark G <<a href="mailto:mratx@aol.com" target="_blank" rel="noreferrer">mratx@aol.com</a>><br>
Cc: <a href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noreferrer">synth-diy@synth-diy.org</a> <<a href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noreferrer">synth-diy@synth-diy.org</a>><br>
Sent: Thu, Jun 25, 2020 5:13 pm<br>
Subject: Re: [sdiy] Ensoniq Esq-1 main board question<br>
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<div style="font-family:trebuchet ms,sans-serif">Usual problems with ESQ-1 are ROM chips (available), corrosion in ribbon connectors and broken display or keyboard controller. Unfortunately that keyboard controller chip (<span style="font-family:Arial,Helvetica,sans-serif">Keyboard controller </span><span style="font-family:Arial,Helvetica,sans-serif">1380 65002 / R1120-12) </span>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.</div>
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<div dir="ltr">On Thu, Jun 25, 2020 at 10:23 PM Mark G via Synth-diy <<a rel="nofollow noreferrer" shape="rect" href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<br clear="none"></div>
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<div>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<font size="2">a</font>ting 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. <font size="2">I acquired copies of the schematics from <a rel="nofollow noreferrer" shape="rect" href="http://buchty.net/" target="_blank">buchty.net</a>, </font><font size="2">but the ones</font> of the main board circuits are <font size="2">not great</font> quality <font size="2">so some things are </font>hard to
read,<font size="2"> which makes troubleshooting more difficult. <br clear="none">
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<div>Does anyone have any knowledge of common main board issues that I
can check, or any tips? I'd prefer to repair the board <font size="2">that </font>I have i<font size="2">f </font>possible, especially since replacements seem to be hard to come by. Any
help would be greatly appreciated!</div>
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<div><font size="2">Thanks,</font></div>
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<div><font size="2">Mark </font><br clear="none">
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