<div>Hey SPW,</div>
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<div>I have an M6 that does the same thing (or did). It turned out to be an intermittent connection in the power supply. I would suggest reseating all the power supply connections (especially the spade lug connections from the transformer to the power supply PCB). I would also suggest reseating the CEM voice chips AND all the board to board connections. I haven't had any problem with the caps in my M6s (got two), but that is still a slight possibility. Also, I had many problems with uneven voice response (VCF setting on one or two voices notably different than others) which was cured by reseating the chips AND running the calibration routine four or five times (yes, it actually did get a little better each time and finally behaved).
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<div>Have fun with the M6. IMHO, the M6 is the biggest bang for the buck out there in vintage analog land (flamesuit ON). </div>
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<div>Cheers!</div>
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<div>Tim (Nomex underwear) Servo<br>-- <br>"Imagination is more important than knowledge." - Albert Einstein <br> </div>
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<div><span class="gmail_quote">On 12/28/05, <b class="gmail_sendername">S. P. W.</b> <<a href="mailto:switchbladekey@gmail.com">switchbladekey@gmail.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hello,<br><br>I recently bought a Matrix 6 (with keys) and (surprise) it has an<br>issue or two. I absolutely love it so am going to fix it come hell or
<br>high water.<br><br>When playing ocasionally all sound output will stop. When that happens<br>I think the menu stops responding to the keypad. A power cycle will<br>always fix it right up. This happens maybe once or twice a week, not
<br>every day or every time I play it.<br><br>Not a big deal in my basement, but could be a problem at practice or<br>especially on stage.<br><br>I have done the master menu > calibrate function. I am assuming the<br>calibrate on power up does the same thing. Should I try calibrating at
<br>every power up?<br><br>I am good with electronics, and read today that reseating all chips is<br>a good idea, so will do that very carefully due to static damage being<br>possible.<br><br>At first blush, this problem looks like some sort of voltage collapse
<br>that "shitshot's" the CPU clock. My first guess is to replace all<br>capacitors with new high quality items, as caps have a finite lifespan<br>that is very near to the age of this synth. (15 years is a rule of
<br>thumb. These are close to 20)<br><br>If someone knows a better place to look, or has run into this before<br>and knows the answer, I would love to hear it.<br><br>take care,<br><br>Steve<br><br>P.S. Hi all, I just finished rebuilding my Moog opus 3 from a pile of
<br>parts, and bypassed the missing chorus with a jumper by going around<br>the squelch circuit. I have the skills to fix the M6, but a pointer in<br>the right direction would be a great help.<br><br></blockquote></div><br>