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An intermittent shorted turn ?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Michael E Caloroso via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 27 May 2024 06:17<br>
<b>To:</b> g m montalbano <montalbanogm@gmail.com><br>
<b>Cc:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] OB8 power transformer</font>
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<div dir="ltr">Voltage surge from lightning strike?
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<div>MC</div>
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<div dir="ltr" class="x_gmail_attr">On Sat, May 25, 2024 at 2:27 PM g m montalbano via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br>
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<div>Yes, the one thing I don't want to hear from a customer is "I read it on the internet; you should do ...."</div>
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<div>HOWEVER, in this case, the customer was correct. I finally got the OB8 on my bench, and the burnt smell (reminiscent of burnt resistor or opamp) is definitely coming from the transformer. But, checking the transformer with a meter & scope reveals that
all voltages are present and correct, and the transformer is running cool; all regulators are in good shape, and the 5V rectifier has been previously replaced with a higher rating.</div>
<div>The synth is playing perfectly.</div>
<div>My question is: what burned on the transformer to create that smell, and why is it now working correctly?<br>
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<div dir="ltr" class="x_gmail_attr">On Tue, May 21, 2024 at 2:16 PM Gordonjcp <<a href="mailto:gordonjcp@gjcp.net" target="_blank">gordonjcp@gjcp.net</a>> wrote:<br>
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On Tue, May 21, 2024 at 03:26:36PM +0200, Roman Sowa via Synth-diy wrote:<br>
> It doesn't necesarily be customer's view, but maybe something another tech<br>
> told him before. <br>
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Which is why we have the plague of HERP DERP MUST REPLACE CAZAPITARS any time people get a faulty (or even just old but not faulty - yet!) piece of equipment.<br>
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-- <br>
Gordonjcp<br>
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