Log in
Register
Home
Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
News
Members
Current visitors
New profile posts
Search profile posts
Features
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Menu
Install the app
Install
Reply to thread
Home
Forums
Pro Audio
Junior Varsity
QSC TouchMix 16 sound problem fixed (other touchmix versions may also get this)
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="Roy Andrews" data-source="post: 216368" data-attributes="member: 15263"><p>100% agree on doing a factory reset & reloading the default profile. It's easy to get settings messed up that might affect output levels. If that's not it though, I do have one other idea for you...</p><p></p><p>The TM16 I worked on was badly brutalized by a caveman (I can't even call whoever this person is a "tech"), and after I replaced the output capacitors, I was still getting low volume on the right main output. Since I had needed to install a number of jumper wires to bypass ruined plate through holes, I was worried that there was yet another plate through hole that was disconnected, and that I might never get the board running again.</p><p></p><p>However, under close inspection using a large magnifying loop, I was able to see that the caveman had apparently been using a rock to remove the capacitors, and while doing so had also unintentionally bashed R15_26 right off the board (only half the resistor remained). This is a 1mm x 2mm 10K ohm SMD resistor, and it is somehow part of the output circuit. There is a similar resistor and set of transistors on each Main & Aux. I believe that the resistor biases the transistor, and that these transistors are either an electronic on/off switch for each channel, or the final drive stage for each output. (I could be way off base on that, but they definitely are related to the output signal path). I think it would be worth checking these resistors and the associated SMD transistors closely, since they could conceivably go bad if the backwards mounted caps are not protecting them properly. It's a bit of a long shot, but without schematics, we don't have much to go on.</p><p></p><p>I apologize if the picture of this brutalized board offends anyone's tech sensibilities, but it is what it is. The mixer is working perfectly & being used in concerts regularly now!!</p><p></p><p></p><p>[ATTACH=full]209568[/ATTACH]</p></blockquote><p></p>
[QUOTE="Roy Andrews, post: 216368, member: 15263"] 100% agree on doing a factory reset & reloading the default profile. It's easy to get settings messed up that might affect output levels. If that's not it though, I do have one other idea for you... The TM16 I worked on was badly brutalized by a caveman (I can't even call whoever this person is a "tech"), and after I replaced the output capacitors, I was still getting low volume on the right main output. Since I had needed to install a number of jumper wires to bypass ruined plate through holes, I was worried that there was yet another plate through hole that was disconnected, and that I might never get the board running again. However, under close inspection using a large magnifying loop, I was able to see that the caveman had apparently been using a rock to remove the capacitors, and while doing so had also unintentionally bashed R15_26 right off the board (only half the resistor remained). This is a 1mm x 2mm 10K ohm SMD resistor, and it is somehow part of the output circuit. There is a similar resistor and set of transistors on each Main & Aux. I believe that the resistor biases the transistor, and that these transistors are either an electronic on/off switch for each channel, or the final drive stage for each output. (I could be way off base on that, but they definitely are related to the output signal path). I think it would be worth checking these resistors and the associated SMD transistors closely, since they could conceivably go bad if the backwards mounted caps are not protecting them properly. It's a bit of a long shot, but without schematics, we don't have much to go on. I apologize if the picture of this brutalized board offends anyone's tech sensibilities, but it is what it is. The mixer is working perfectly & being used in concerts regularly now!! [ATTACH type="full" alt="Touchmix-R15_26.jpg"]209568[/ATTACH] [/QUOTE]
Insert quotes…
Verification
Post reply
Home
Forums
Pro Audio
Junior Varsity
QSC TouchMix 16 sound problem fixed (other touchmix versions may also get this)
Top
Bottom
Sign-up
or
log in
to join the discussion today!