Ok, how old is this pedal? When was it manufactured? Maxon built pedals for Ibanez and also sold some under their own name, so there are some early OD-9s that are supposed to be very close to the TS-9. But these have had various re-releases and modifications over the years.
Also can you post a photo of the pedal's guts? (There's a link below the 'post reply' box that says "Add image to post") That might help a bit too.