MF-101 scratchy CV input

The Moog Forum Moogerfooger Forum
1

I have an MF-101 that seems to have some scratchiness on the filter cv in. Whenever I use a pedal to sweep the frequency of the filter, I get a scratchy or static-y sound around the middle/ top of the throw. Manually tweaking the filter cutoff via the front panel knob results in a clean sweep.

I have tried it with other expression pedals and have got the same result, so I know it is not an issue with my EP-2. Does anyone know what could be causing this, and if so, can it be fixed at home or do I need to make a Dr.'s appointment? :confused:

2

Sounds to me like a bad solder joint on the jack itself.

3

or just bad connection between jack and plug…spray in some contact cleaner and insert/remove the plug several times.

problem persists after cleaning? maybe a bad jack, jack solder joint or something else bad in the circuit. but at least you’ve ruled out dirty contacts as a possiblity

4

Yeah, that’s also possible. :bulb:

5

Could it be the cable that comes from the EP2 and the connection on the jack there as well.

I never liked my Ep1 because the whole thing is like paper and i always feared that the permanent cable would start shorting out.

6

That still would not explain why his other pedals are affected with the scratchiness, but that was my first thought as well. :mrgreen: You’re starting to understand troubleshooting, EricK! That’s almost as awesome as Chuck Norris! :smiley:

7

AH, I tend to post before I read the whole thing sometimes lol.