<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Dan,<div><br></div><div>Measure the power rails in both directions with your ohm meter. So red on +15, black on 0. And then black on +15, red on 0. Check if the lowest reading looks reasonable. Repeat for all other power rails.</div><div><br></div><div>Did you get those tl082’s from a reputable supplier?</div><div><br></div><div>Are there any tantalum capacitors in the sx210? They tend to fail short circuit.</div><div><br></div><div>Ben</div><div><br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On 22 Mar 2025, at 17:34, Dan Weal via Synth-diy <synth-diy@synth-diy.org> wrote:</div><br class="Apple-interchange-newline"><div>
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Hi all,</p><p style="font-size: 16px; -webkit-text-size-adjust: auto; caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif;">
Was really hoping someone can help.</p><p style="font-size: 16px; -webkit-text-size-adjust: auto; caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif;">
I previously mentioned replacing the diode rectifiers in the psu due to them getting hot.</p><p style="font-size: 16px; -webkit-text-size-adjust: auto; caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif;">
But it transpires there looks to be a problem with the 5v rail causing it to get hot.</p><p style="font-size: 16px; -webkit-text-size-adjust: auto; caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif;">
I have Checked both cpu and voice board but I can’t find any issues.</p><p style="font-size: 16px; -webkit-text-size-adjust: auto; caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif;">
Would anyone know what resistance is ohms I should be getting from the +15 and -15v rail. When I check I am getting 650 ohms. Is that right???</p><p style="font-size: 16px; -webkit-text-size-adjust: auto; caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif;">
It’s weird because the synth was working then suddenly a few tl082 s went down I replaced them then it keep blowing the psu fuses.</p><p style="font-size: 16px; -webkit-text-size-adjust: auto; caret-color: rgb(34, 34, 34); color: rgb(34, 34, 34); font-family: Arial, sans-serif;">
Thanks all.</p>
<div dir="ltr">Best regards,
<div><br>
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<div>Dan</div>
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