Harpo said:Doesn't matter. Your measure for unity gain (complete unit, XLR voltage in=XLR voltage out) at the jumpered/audio-VCA removed channel. If you have more than one multimeter and a spare jumper, you could measure both channels simultaneously for whatever reason.rob_gould said:Harpo said:Pull out the audio VCA and jumper VCA-In to VCA-Out (pins at center of the smaller VCA module sides) with a piece of wire (diameter and length of a paper clip might come handy if you have the VCA pins in sockets). If you now have undistorted audio with unity gain level, you know the culprit ...
This went off the boil for a bit but I want to get back on it now. I will do perform the test you suggest this weekend.
Do I need to remove both VCAs or can I just test one channel and leave the Gold Can in the other channel?
I've finally got this on the bench and started to test, aaaaaand
Now the unit doesn't pass audio on either channel when it is in normal or GSSL mode. In bypass audio passes cleanly. Turning any of the controls has no effect on this.
Currently I have the left hand side with VCA in jumpered to VCA out and the right hand side still has the gold can in place.
I'll start going through the circuit to see where the signal gtes lost tomorrow. Strange that both sides have the same behaviour. That points to the control board being the culprit in would guess...