Tune knob stopped working
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Tune knob stopped working

by inget on Sun Mar 10, 2013 12:21 pm

I bought a x0xb0x (built to adafruit specs) a couple of months ago. Recently my tune knob stopped working. I can still tune it with tm5/tm4. I also checked the tune pot with a multimeter and it works. But as I have not built it myself and have very limited knowledge about how to build or troubleshoot one I'm kind of stuck. What should I check next?
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Re: Tune knob stopped working

by antto on Mon Mar 11, 2013 4:05 pm

check if you got 5.33V on one of the outter legs
then test for continuity between the middle leg and R118 (while x0x is switched off)
We are here too: irc.freenode.net >>> #x0xb0x
..:: c0nb0x v1.00 ::.. http://forums.adafruit.com/viewtopic.php?f=7&t=29282 (new control app - win/osx)
VCO Tuning: http://forums.adafruit.com/viewtopic.php?f=12&t=24759 (do it the EASY way)
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Re: Tune knob stopped working

by synthplayer on Wed Mar 13, 2013 10:41 pm

The middle pin of the TUNE pot should vary from 0V to 5.33V as you turn the TUNE pot from one end to the other, you should also try retouch the joints of R118 and the TUNE pot with power off.
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