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No output!

by Fotis on Fri Nov 23, 2012 6:05 pm


My xoxbox suddenly started having very low output and after a while, no output at all! It turns on, lights and all seems to be working fine..but no output at mix out or headphones. I'm trying to fix it myself with the help of a friend, we try to measure and follow the signal path according to the schematics and soon we'll have an oscilloscope.

Any help or guidance would be highly appreciated!:)

Posts: 1
Joined: Thu Nov 22, 2012 1:38 pm

Re: No output!

by synthplayer on Wed Jan 09, 2013 1:09 am

Here are few things you can do to troubleshoot, just to narrow down which block the problem might be.

First go into RANDOM mode, then

Check VCO for output
1. Measure with a meter in AC mode or better yet, look on the CRO at node R62 connecting to the WAVEFORM switch to see if you have SAW and SQUARE wave.

Check VCF for output
2.Measure with a meter in AC mode or look on the CRO at C14

Check VCA for output
2.Measure with a meter in AC mode or look on the CRO at C38(Volume pot pin 3)

You should get at least >1V at all of these points.

Your description sounds like some sort of bad contact.
Posts: 20
Joined: Sat Dec 13, 2008 5:54 pm