Hi - welcome to the forum!
shparsh wrote:
I built the signal tester and know how to minimally use my multimeter.
Good deal, you have all you need to find out what's wrong.
We know that the dry signal path is working, but we need to figure out why you're not getting wet output. PCB map and schematic are below for reference.
MultimeterTake a few DC voltages. If you're not sure how, there are lots of tutorials on youtube.
Take voltages on the FV-1. Pin 1 have the dot next to it. You should have 3.3 volts DC on pins 6 and 8. You should have zero volts/ground on pins 4, 7, and 11 - 13.
Signal Tester
Make sure you understand how to use this tool.
1) Make sure that signal is getting to the FV-1: listen for signal at R15 and pin 1 and 2
2) See if signal is exiting the FV-1: listen for signal at R17 and pin 28.