Fulltone RTO wiring and tone control issue

[beedoola]

I got this Robin Trower OD. Previous owner removed the footswitch. I’m a little stumped as there are two leads left - one should be for the LED to the footswitch, the other I have no idea.

the tone control also doesn’t work/has no effect. The volume and drive work. I’m trying to go through the circuit based on these layouts.

http://2.bp.blogspot.com/-ws7iD3sZfJ...tone%2BRTO.png


https://tagboardeffects.blogspot.com...drive.html?m=1

[The Dude]

Trace the wires and see what they connect to in the circuit. A schematic would be more helpful, if you can find one.

[beedoola]

I haven’t been able to find the schematic

[The Dude]

I think it's just a modified/tweaked TS9, so this should be close enough to figure out how it's configured even though some values may be different.

[beedoola]

Thanks for that schematic. I found the 220r that should be coming off the tone wiper was 4.7k. It’s weird if Fulltone did that stock. Could be the pedal was modded.

Also found a wiring schem online via pictures of the OCD. It’s working but not sure if it’s working fully so I’ll have to snoop around.

c2 was not included in the build.

[beedoola]

I meant C2 on the PCB was not included. Not from the schematic shown.