Echo dream 2

[Carlinb17]

Hello, I was asked to trouble shoot a pedal... and now I need some guidance. It's a echo dream 2 based on a dba pedal. I get no fuzz whatsoever from the pedal. It just brings up the volume. Delay works so I imagine that the 2399 chip is good. In looking into the pedal it seems wrought with issues on the few boards I could find. I didn't find any definitive schematic and this one doesn't use a charge pump. I suspect it's the xr2206 chip, some of the boards said it runs at 18v but whoever built this put in 16v electrolytic capacitors so I cannot try it with 18. With 12 it doesn't seem to change anything. I did t know if anyone had any experience or ideas.

Thanks

[moid]

Not sure if it helps, but I have a schematic for that pedal... I don't recall where I got it from though. It's very hi res, so I hope it scales up when you click on it. I've never built this circuit so can't offer any advice on how to fix it.

[Carlinb17]

thanks for the schematic, I will try to go though the pcb according to it and see.

[rx5]

it could be that the op-amp is dead. on my (unfinished) build, in using TL072. check around the fuzz section. maybe there is short somewhere. or maybe a dead fuzz pot also.