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Junior Varsity
QSC TouchMix 16 sound problem fixed (other touchmix versions may also get this)
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<blockquote data-quote="Roy Andrews" data-source="post: 215930" data-attributes="member: 15263"><p>Brian;</p><p></p><p>Thanks so much for clarifying which part number of boards are affected. I pulled out my little TM-8 a couple weeks back after many months of sitting, and I was dismayed to discover that there was only a little bit of output on one of the mains. This thread really helped me get to the bottom of the problem & order some parts for repair.</p><p></p><p>I just wanted to ask a few additional questions, if you might happen to know the answers:</p><p></p><p>1) The 4 AUX outputs all have just 1x 47uF 63v electrolytic on them, but the MAIN L & R seems to have 2. Do you know the reason for this? I guess both of those caps should be reversed?? (both of them were failing on each channel)</p><p></p><p>2) Is this stencil / PCB labeling problem just isolated to the MAIN & AUX outputs? For example, is the large bank of electrolytic caps for the INPUT channels labeled correctly, should they ever fail / need to be changed?</p><p></p><p>3) Due to the worldwide shortage of electronic components, I was forced to use similar, but not identical models of capacitors, is this likely to be a problem? Eg - my board has Nichicon VZ series from the factory, but the only replacement I could find in stock (only 17 available!!) was Nichicon KW series. They are both considered "audio grade", and the same capacitance / voltage / temperature according to Mouser specs, so it's unclear to me what the difference might be.</p><p></p><p>Thanks so much for the great info in this thread</p><p></p><p>Roy</p></blockquote><p></p>
[QUOTE="Roy Andrews, post: 215930, member: 15263"] Brian; Thanks so much for clarifying which part number of boards are affected. I pulled out my little TM-8 a couple weeks back after many months of sitting, and I was dismayed to discover that there was only a little bit of output on one of the mains. This thread really helped me get to the bottom of the problem & order some parts for repair. I just wanted to ask a few additional questions, if you might happen to know the answers: 1) The 4 AUX outputs all have just 1x 47uF 63v electrolytic on them, but the MAIN L & R seems to have 2. Do you know the reason for this? I guess both of those caps should be reversed?? (both of them were failing on each channel) 2) Is this stencil / PCB labeling problem just isolated to the MAIN & AUX outputs? For example, is the large bank of electrolytic caps for the INPUT channels labeled correctly, should they ever fail / need to be changed? 3) Due to the worldwide shortage of electronic components, I was forced to use similar, but not identical models of capacitors, is this likely to be a problem? Eg - my board has Nichicon VZ series from the factory, but the only replacement I could find in stock (only 17 available!!) was Nichicon KW series. They are both considered "audio grade", and the same capacitance / voltage / temperature according to Mouser specs, so it's unclear to me what the difference might be. Thanks so much for the great info in this thread Roy [/QUOTE]
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QSC TouchMix 16 sound problem fixed (other touchmix versions may also get this)
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