Emu XL-7 & MP-7 User's Group

It is definitely an inductor, I tried a 220R resistor in it's place and yup it was clipping. 300k works best. On my particular command station the Volume knob no longer works. It does not do a smooth volume gain, only full or you turn it down a bit and you lose sound like off.

I just got a 10uH inductor to try it out and it did not fix the volume problem or it did not clip but it did introduce a whine sound so I put back the 300k resistor instead, that gives no whine.

Oh well I give up.
Better then nothing, I am using an external headphone amp as a solution when I want to work in private with no booming sound.

I did pimp out my MP7, I changed LED's to Blue, Orange, Yellow, and white. I also replaced all the tactile switches. 

I might sell this one on ebay maybe because now that I know how to fix these I scored on (2) more command stations really cheap: an xl7 and one more Mp7. The volume works on both of those. I have no idea how to measure the inductor on those. There is no marking either.

--- In xl7@yahoogroups.com, Alwyn <zardac@...> wrote:
>
> >
> > 1. 'L7' labeled part seems to be an inductor. i have no idea what micro
> > henry it requires and what Amp rating. I instead just used a 300k 1/4 watt
> > resistor in it's place. Well the burnt area messed up the smt solder pads
> > so I had to solder jumpers following the trace. It turns out the pads go to
> > +5v and Leg #3 on the Master pot. The higher you go in resistor value the
> > lower the overall main boost. So 300k - 370k is good. Anything below 220k
> > and you get saturated distortion.
> >
> 
> Is L7 the same sort of PCB footprint as a SMT resistor or capacitor?  If
> its one of them it might be a ferrite bead.  they have some similarities to
> an inductor for it's filtering, but they don't have the coils to build up
> the magnetic force. If it is a ferrite bead, then a 100R resistor will
> behave in a similar way for audio frequency signals.
> 
> If L7 is indeed meant to be a ferrite, then the clipping might suggest
> something else isn;t working?
>