Kroars
Well-known member
Alright, I’m stumped. It’s been a while since I couldn’t debug a build. I’m hoping one of you kind folks could help. I built two AionFX DZ4 (VH4 Preamp), one works great one does not. Did the usual continuity checks and everything checked out. Traced signal path with the schematic and started probing. Everything was fine until pin 2 of IC1. It was very, very faint signal as compared to the working build that had a strong signal on pin 2 of IC1. Started taking voltages and found I’ve got 12 volts running through nearly every pin of IC1 and IC2 and IC3….. Swapped out all IC’s for new ones, same issue. Checked the anode of D1 on both builds and the working one shows 0.0001 and the non working one has 10.51v at the anode of D1. I see no obvious shorts and after a few hours of probing, visual inspection, taking voltages and swapping components- I am at a loss. Hoping someone could pitch me an idea. Could it be that two of the traces are shorting spilling 12v into the signal path? Any help is appreciated.