Awful Waffle Op Amp Issue

[Ronnie Hotdogs]

Hi all
I’m finishing up my first build, as I’m from NZ I had to do the Awful Waffle.

I’ve just done a quick test and found while I’m getting audio with it off, once I switch it on there’s nothing.
Power is fine, so I did a quick work through with a multimeter and think I’ve found the issue at the op amp.
If I’m reading the schematic properly (and please bear with me as I’m still learning a lot of this) the signal exits through pin 6 toward the 10k resistor at R8 - and this is where I seem to have a break, as in these are the only components in the chain where there seems to be no activity.
Everything up to, and then after that point appears to be flowing.

What I’m wondering is whether I just swap the op amp out, or is there a specific issue I might be able to sort given it only appears to be one leg of the op amp.
Or is everything I’ve surmised absolutely incorrect

Cheers!

 

[owlexifry]

Hi all
I’m finishing up my first build, as I’m from NZ I had to do the Awful Waffle.

I’ve just done a quick test and found while I’m getting audio with it off, once I switch it on there’s nothing.
Power is fine, so I did a quick work through with a multimeter and think I’ve found the issue at the op amp.
If I’m reading the schematic properly (and please bear with me as I’m still learning a lot of this) the signal exits through pin 6 toward the 10k resistor at R8 - and this is where I seem to have a break, as in these are the only components in the chain where there seems to be no activity.
Everything up to, and then after that point appears to be flowing.

What I’m wondering is whether I just swap the op amp out, or is there a specific issue I might be able to sort given it only appears to be one leg of the op amp.
Or is everything I’ve surmised absolutely incorrect

Cheers!

in order for us to assist:

step 1: take photos.
step 2: measure and note the voltages at each pin of the opamp.

 

[falco_femoralis]

If you are getting no signal at all with the pedal on then the simplest problem would be a short to ground in the signal path. I would use the continuity function on your meter and check that none of the signal along the audio path is shorted to ground. The signal passes thru R6 & R7, as well as C3 & C4 before it reaches R8 so I would also check those out as well. Check to see that there is continuity between these components as they are laid out in the schematic, and that none of them are shorted directly to ground. Look closely at your solder joints and make sure none of them bleed over into each other. I would also go over R4 & R5, C2, and their traces. If anything appears off then that would be where your problem is.

You can try making an audio probe and tracing the signal from the amp back. I haven't had to do this too much so I can't guide you on it, but there are some write ups online.

I would leave the op amp in for now, until you troubleshoot further, as removing it can be difficult if it isn't socketed, and can lead to more problems. If it is socketed and you have a spare then definitely try it out.