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

Taken from the FAQ in the files section..

-I have a humming sound in my headphones when they're connected to 
the Command Station, is it defective?

No, the hum can actually be caused by a few things. Sometimes after 
installing a new Sound ROM, the two halves of the Command Station 
outer cover may not be secured tightly enough. Use a philips head 
screwdriver to check that all of the screws are securely seated. Also 
check to see if the headsocket itself is securely fastened to the 
unit as that too may be an addition cause of the noise. Some users 
have reported that using a 12v lamp plugged into the unit may 
occasionally cause some minor noise in the headphones. Lastly, check 
if the ribbon cable connecting the headphone circuit board to the 
main circuit board has come loose inside the machine.

Check all your screws are tightened down etc
Gonz



--- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> The command station is plugged to a mixer (Mackie 1604 for that 
> matter... it has its' own problems, but the buzz is definitely 
coming 
> from the MP-7). All audio equipment is powered from the same outlet 
> if that matters. However the buzz is also present in the headphones 
> plugged straight to command station's phone output. Recently was 
> doing something in headphones and it got really annoying - that's 
> when I decided I got to do something about it.
> 
> --- In xl7@yahoogroups.com, "gonzinigonz" <gonzini@f...> wrote:
> > There are grounding issues with the command stations. I had the 
> common 
> > problem with the headphone jack buzzzzzz. 
> > Tighning all the screws cured the probelm (or it might of been 
> loosen 
> > the headphone jack nut.. or both.. cant remember)
> > Maybe you could try this. Its mentioned in the XL7 FAQ thats in 
the 
> > files section (i think..)
> > How is it plugged into your studio? ie into a desk, into a 
> computer?? 
> > (that will most proberly buzz...)
> > Give us a bit more info and we might be able to help you more :o)
> > Gonz 
> > 
> > 
> > --- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> > > 
> > > Hi all,
> > > 
> > > I've posted this question a while ago, and got no replies.
> > > But the problem hasn't gone, and I really want to do something 
> about 
> > it.
> > > Any hints/tips will be greatly appreciated!
> > > 
> > > So:
> > > - the first time I mentioned phone outputs only, but actually 
the 
> > buzz 
> > > is present in main outs as well;
> > > - its' loudness is constant, not affected by master volume at 
all;
> > > - this looks like a stupid grounding problem - maybe someone 
> familiar 
> > > with the innards of a command station has an idea *where* it 
can 
> be?
> > > 
> > > Cheers!
> > > Boris.