I’m just now seeing your post from the 12th. I’m sorry that I haven’t been more available to help you. I’ve been so busy with trying to get a new product released, taking care of a very sick 6 year old, and staying up with my baby who’s not sleeping well that i haven’t had time to help you (or anyone else that i’m currently in the process of helping) troubleshoot anything for the past few days. I’m sorry that you took my busyness as “blowing you off”. We are not obligated to help our customers build their kits, but we do it because i have a passion for helping people understand their gear. When someone gets a kit (instead of a ready to play product) part of the process of building it is troubleshooting, which takes a lot of patience. I will do my best to help you, but i can’t guarantee anything because a lot has to do with your skills and knowledge. In our previous posts i think maybe i was assuming too much…I’ll try not to assume anything.
Now, let’s get on to troubleshooting…
I don’t want to assume anything or be condescending, but it would be helpful for me to know if you can read and understand the schematic in the back of the assembly manual. And (also not to be condescending, but) if you don’t understand anything i’m asking of you please just let me know and i’ll explain…we’ll save a lot of time and frustration that way.
The high frequency signal path works, but the low frequency path doesn’t. We’ve narrowed down that the digital side of things is working…the low opto led is lighting up. So we know the issue is in the analog path. You said you corrected the jumpers and now they are soldered correctly. To be sure of that, (with the power off) please test the continuity between pin 1 on U2 (the TL074) and TP3 (they should be connected, test them with your meter’s beep test). Also test the continuity between TP4 and R5 (the pad closest to R19 and R20). These tests will tell us if the jumpers are soldered correctly. Sometimes when the jumpers are heated up too much one of the little rectangular pads can come off the board.
Please make those tests and let me know what you find.