[sdiy] Korg EX-8000 Problem...

[Bob Weigel]

Hmm. It's...showing aftertouch messages? I'm trying to recall..is there 
just a midi led indicator on the ex? I just have polys here..one for 
sale btw as soon as I figure why the last potential buy claimed of it 
skipping to random patches! I can't get it to do it...

ANyway if the thing is showing AT messags then hey...it's receiving midi 
obviously. No magic smoke on that end. Perhaps the channel just got 
reset errantly or something? That's pretty strange otherwise. I don't 
know how the midi indicator light responds on that but if it's 
responding at all then nothing could be fried I beleive. All that 
circuitry is digital with opto i/f and the only way you can smoke 
something is to get a hot leg from something on the ground maybe and 
feed through a 47ohm resistor to an ouput ground or something. It's on a 
wal wart so it's isolated. It would have to feed through to something 
else that is grounded like a mixer. Isolate ALL connected things and 
check for floating AC voltages before proceeding. I recommend buying a 
little AC indicator light that works when you just touch it. It has a 
high impedence resistance and uses you as an antenna basically and you 
dissipate just enough power to light a tiny neon lamp :-). Great tool. 
As long as your stupid roommate doesn't borrow it and get it wet inside 
somehow....ouch. -Bob

Dave Garfield wrote:

>Hello, All!
>
>Having a bit of a problem with my Korg EX-8000.  It’s first in a chain
>of modules driven by my Fantom X8. 
>
>Last night, I hooked up a PG-800 Programmer to my second-in-MIDI-line
>Roland MKS-70 and took it for a test drive.  Well, without thinking, I
>didn’t turn on the EX-8000.  Naturally there was no MIDI input to the
>MKS, so I turned on the EX.  It booted up ok, showing the “8000” in the
>display, BUT!... there was no sound, one of the Parameter segments
>wasn’t lit, and the MIDI Indicator was not showing any Note On/Off
>information – just aftertouch.
>
>The EX’s memory back-up battery was replaced about two years ago, and
>the thing worked FINE until last night.  Is it possible that I released
>some magic smoke from something?  Is there a protection diode or
>something in the MIDI input that I might have tested to destruction? 
>The suddenness of the problem has me baffled.
>
>Yeah, I know.  Next project – Multiple MIDI Thru Box!
>
>THANKS! for your help!
>
>Dave Garfield, scratching his head in Colorado
>
>
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