Lexicon Mx200 Reverb Delay 1u Effects Processor "clean encoder" Questions

...to encoder through an opening so the spray gets inside will help clean contacts.  If the knob itself is hard to turn, the shaft is likely bent, and there may be damage to the encoder

...clean like the amp did.  If no sound or distorted sound is found here- which is the most probable location, it is likely one of the IC chips is at fault.  Likely a 4558 if an IC fault, ...

...and look at the sensor. If it is an optical pickup, then use the canned air pressure to clean the area of dust. If it happens to be a mechanical switch, then the mechanical encoder has to be

My jog wheel on denon dn s1000 is messsing up will not work properly The encoder probably has dirt or dust in the pickup. Remove the wheel and clean the sensor area.