This will be the short version of a very long story that started here (
viewtopic.php?f=9&t=59689).
I de-soldered the 4 wires going to the effects board and soldered up the Tayda foot switch board to see if it would work since I had gotten the pedal sorted out. It did not. So I re-attached the 4 original wires and boxed it up. Plugged it to it to confirm that all was well, and well, all was not! I am back to the original problem, by-pass works, effects doesn't. There is however a VERY faint signal at the output (same as the first time). I also re-flowed those 4 connections just to be safe. Voltage at IC 1 pin 1 is not correct.
The first go round the voltages at IC 1 were as follows:
Pin 1 8.7 Pin 8 9.2
Pin 2 1.5 Pin 7 4.6
Pin 3 4.1 Pin 6 4.6
Pin 4 0.0 Pin 5 4.6
After the pedal was working the voltages were as follows:
Pin 1 4.6 Pin 8 9.3
Pin 2 1.5 Pin 7 4.6
Pin 3 4.1 Pin 6 4.6
Pin 4 0.0 Pin 5 4.6
So I am assuming that the 8.7v on pin 1 of IC1 is where to start looking. Just for giggles I swapped out IC 1 (LT072) with a brand new one I had in my parts bin. There was no change.
This schematic
http://byocelectronics.com/shredderschematic.pdf is very close to the Tayda PCB (Tayda doesn't have a schematic for this particular PCB).
Any suggestions as to where I should start looking?
Thanks, in advance...