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

What you described sure does not sound like a fuse.  It would be tough 
to tell without opening it up (can you tell I like to do that?) and 
seeing what is going on.

Not sure if you know or care about electronics, but for those of you 
curious I will give some info here.

The P2K (all the Emu's really) have an internal power supply that 
provide the electrons to make the whole thing work.  In computer 
systems the most electronically vulnerable parts are in the power 
supply (usually).  The entire guts of the synth (in the case of modern 
Emu's) runs from a +5v power supply, same as a computer.  These things 
are pretty insistant that they get their +5 Volts.

The power supply turns wall juice at 115v or 220v AC and creates nice 
smooth 5 volts.  (Yes there are some other voltages in there, I know).

Last time I saw a synth do what you described was a Roland MKS-50.  
The result was that a component in the power supply burned up, and the 
voltage went crazy, then quit all together.  Most folks who design the 
guts of computers / synths will have ways of protecting the delecate 
(electronicly) computer type parts. This would include the DSP chips, 
memory and the D/A converters from wild swings in voltage. And the 
power supply is usually designed to be the part that blows a 5 cent 
diode when things go wrong.

Now, again, there is no way to tell without opening it up, but the 
damage might not be so drastic.

But of course that is not helping you get your project done.

Sorry to all of you who think this electronic mumbo jumbo is naff!  
Back to making music!

Bruce