Re: x0xi0 Full Kit - Install & Troubleshooting
After letting my unfinished x0xI0 rest in a box for a couple of years (one of the first custom pcb, standard case kits) I decided to finish it last week.
Everything went well except that I have 2 issues:
- VCO1 square wave not working
=> When the VCO1 waveform selection switch is set to "SAW", The square wave is clearly present on PIN 2, however when I switch to square, the sound drops to silence.
As a test, I turned down VCO1 volume (VR405) all the way and injected the square signal from PIN 2 after VR405 (with the waveform selection switch set to saw). The result was still silence.
I then proceeded to inject the signal further down, right after R418 (using a ±200k resistor to level it). The result was hearing a perfect square as one would expect from a x0x.
Other things I tried is bypassing the VCF by placing a jack into the VCO OUT. This did not help.
Any ideas of things I can try?
- ENV (2?) issues
I have read quite a lot about the subject, so I think I know how things should respond, but I think it doesn't work like it should.
I don't seem to get by the first test in the manual, whatever I try, the ENV2 led is either on or off. I haven't researched this in detail yet, I'd like to get VCO1 fixed first.
Another -not so annoying- issue with the ENV that may be related is that sometimes when I press stop, I get a "hanging" note, which sustains forever. The only way to stop it is by playing and stopping again. I've confirmed that this is not a firmware issue by trying several firmwares.
I have contacted Brian about the VCO1 issue, but a solution hasn't come up yet. Due to my impatience I'm posting it here, it may help other people.