Check the resistance from the R15 - C17 junction to ground. It looks like there is either a short on the board or you have the ADE-1 installed incorrectly. If you have a short, pull C17 and recheck. The ohm meter will tell you if that is the case. While you are ohm metering, check the 100 ohm resistor to see if it really is.
Mixer should look like this.
Leonard
