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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: 216331" data-attributes="member: 15263"><p>Schematics... good luck with that. If you know someone who works at an authorized QSC service center, you might convince them to give them to you with a nice present of a bottle of Johnnie Walker Blue or something of similar refinement. Outside of that, not a chance. Many of their power amps and the K series speakers are online though, if you search for that, you can find them on one of those manuals collections sites - obviously not authorized releases!</p><p></p><p>Anyway, no technician worth his salt will actually need schematics to replace these capacitors. I've included pics of the Touchmix 8 auxes and mains, BEFORE the caps were changed. Notice the bulging tops on some of the capacitors. The first photo below is the mains. For some reason, they have TWO capacitors on each channel - these are the caps in the "valley" BETWEEN the rear panel XLR outputs and the input XLRs:</p><p></p><p>[ATTACH=full]209566[/ATTACH]</p><p></p><p>These are the aux channels (just 4 on the TM8), again, it's just the electrolytic caps in the space between the rear panel at the bottom of the photo and the input XLRs in the middle of the photo.</p><p>[ATTACH=full]209567[/ATTACH]</p><p></p><p>REMEMBER !!!! REGARDLESS of what the white letters & symbols on the circuit board say, you want the POSITIVE (+) side of each capacitor connected to pin 2 (hot) of the XLR output jacks. I recently worked on a mixer with a date code of 2020, and the markings on the board were STILL WRONG!!!</p><p></p><p>In terms of repair time, it should be less than 2 hours. Depends a lot on the person I guess. Be sure to warn him to be extremely careful when he separates the main board from the top panel... the flex cables from the LCD are quite short & very delicate!!!</p><p></p><p>The more I see of this mixer, the more I think that the blown caps problem may often be caused when the Touchmix is used as a sub mixer (like for drums or multi keyboards rig), and the auxes get connected to a front to house console that has phantom 48v power turned on. Since these capacitors are mounted backwards from the factory, then will pop in such a situation. Meanwhile, I have not heard too much about caps going bad on the Touchmix16 stereo auxes (7/8 & 9/10), which are on 1/4" jacks, and are much less likely to get connected to an XLR with phantom power turned on.</p><p></p><p>If anyone wants to figure out their mixer's build date:</p><p>[ATTACH=full]209565[/ATTACH]</p></blockquote><p></p>
[QUOTE="Roy Andrews, post: 216331, member: 15263"] Schematics... good luck with that. If you know someone who works at an authorized QSC service center, you might convince them to give them to you with a nice present of a bottle of Johnnie Walker Blue or something of similar refinement. Outside of that, not a chance. Many of their power amps and the K series speakers are online though, if you search for that, you can find them on one of those manuals collections sites - obviously not authorized releases! Anyway, no technician worth his salt will actually need schematics to replace these capacitors. I've included pics of the Touchmix 8 auxes and mains, BEFORE the caps were changed. Notice the bulging tops on some of the capacitors. The first photo below is the mains. For some reason, they have TWO capacitors on each channel - these are the caps in the "valley" BETWEEN the rear panel XLR outputs and the input XLRs: [ATTACH type="full"]209566[/ATTACH] These are the aux channels (just 4 on the TM8), again, it's just the electrolytic caps in the space between the rear panel at the bottom of the photo and the input XLRs in the middle of the photo. [ATTACH type="full"]209567[/ATTACH] REMEMBER !!!! REGARDLESS of what the white letters & symbols on the circuit board say, you want the POSITIVE (+) side of each capacitor connected to pin 2 (hot) of the XLR output jacks. I recently worked on a mixer with a date code of 2020, and the markings on the board were STILL WRONG!!! In terms of repair time, it should be less than 2 hours. Depends a lot on the person I guess. Be sure to warn him to be extremely careful when he separates the main board from the top panel... the flex cables from the LCD are quite short & very delicate!!! The more I see of this mixer, the more I think that the blown caps problem may often be caused when the Touchmix is used as a sub mixer (like for drums or multi keyboards rig), and the auxes get connected to a front to house console that has phantom 48v power turned on. Since these capacitors are mounted backwards from the factory, then will pop in such a situation. Meanwhile, I have not heard too much about caps going bad on the Touchmix16 stereo auxes (7/8 & 9/10), which are on 1/4" jacks, and are much less likely to get connected to an XLR with phantom power turned on. If anyone wants to figure out their mixer's build date: [ATTACH type="full" alt="Touchmix date code chart.JPG"]209565[/ATTACH] [/QUOTE]
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QSC TouchMix 16 sound problem fixed (other touchmix versions may also get this)
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