Im upto the VCF on my x0x and i installed everything as per the instructions, doubled checked every part and tested every resistor.
I went to test the sine wave on the oscilloscope and i found i had a quite small wave going on, having to zoom right in on the scope to actually see (.2v and lower) it but whenever i turned the reso upto it didnt do anything, a bit of a subtle movement but nothing that looked like a resonant wave. The filter changed the amplitude of the sinus wave i did see.
i checked the voltage bias of the R105 for the saw wave and it was sitting at about half, 4.3v there abouts. i thought this was strange so i disconnected everything and went back to the start and tested everything to see where the issue might be. My variable power supply was giving 3v's and the power board was giving me all correct readings, the vco waves were back to normal again, 8.5v dc bias for saw and around 6.8/9v for square so i decided to test the oscilloscope again for the VCF. Before doing that i noticed that my potentiometer on VR2 (i think, it was the first potentiometer i put onto the main PCB) was a bit un aligned so i desoldered the 3 pins uptop and moved it a bit then resoldered it back.
I had everything hooked up as usual and i normally ground the scope to the 5v Regulator on the I/O board so i went to do that, the second i hit the lug with the scope ground clip it cut the power to my entire bench (kill switch flicked over). I thought this was strange, reset everything, started again, this time with the scope turned off, went to clip the ground for the probe on and again, entire bench power cut..
im sorda wondering what to do, do i try again, is the scope causing this? what else can i ground the scope on ? if im still getting the right bias outta the saw/square waves with all the VCF parts in could i move on or is this a povital test? also i noticed in the pictures that when they are testing the VCF they dont have caps C28 and the one above (cant see it in the picture, maybe C29) installed in the board, yet the VCF parts states they are to be soldered? is the potentiometer no good? i checked all my soldering and it looks fine, not sure what to test next?