Hi, my big box EHX frequency analyzer EH 5000 box / EC 9000 pcb suddenly quit working, I only get the pure tone generator sound on output, Blend ctrl. and tone switch do not work anymore. Switching tone switch ON cuts down output signal completely. The pedal is modded to FX On Status LED and EXP pedal Output, using the Direct Out with a stereo jack, wired parallel to the Shift ctrl. It used to work fine during a long time after the mods. So I need some help to fix that great pedal.
Thanks for help and hints
Klakto
https://www.audioservicemanuals.com/e/e ... -schematic