[sdiy] MG-1 question

[phillip m gallo]

Dan,

Not likely that the cap has failed as it as it would have to have failed by
changing it's capacitance to a much "greater" value than stock, also the
faders are getting notorious as time goes by.  Because the faders are
relatively "cheap" models side to side action (most inadvertent from moving
or brushing with the hand) slowly causes the housing to loosen up.  If this
is the case the "wiper" of the pot isn't always in contact and it performs
as if the pot is all the way "on".   Dirt could also cause the "wiper" to
not make contact.

I would try to clean it with std contact spray (you'll get lot's of opinions
on what is best to clean pot's but in this case contact cleaner is a good
start).  Give it a good bath.  If this doesn't fix it then you may have to
remove the slider caps, un-screw the top housing.  If you do this, look at
the glide pot and check to see if the housing is "loose".  If so carefully
look at it and find where you can use pliers to re-seat the housing.  Test
it to see if it is now working.

While your in there, and if you think you audio level is too low (as many
do) remove R102.  Instructions regarding this can be found at:

http://www.geocities.com/gallomagnetix/mg1x.html

good luck.

regards,
p

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Schierl, Dan
Sent: Friday, February 04, 2005 9:53 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] MG-1 question


hi list!

i have a couple problems I'm trying to work out, but the one I wanted to ask
you folks about is this issue I've had with my MG-1 for quite awhile. very
frequently, I've noticed that the "Glide" control acts like its turned all
the way up when really, its not. i can't quite tell what sets it off, but
once in awhile the machine acts like it just drank a bunch of cough syrup.
I've looked at the schematic and I'm thinking somethings up with either the
slider R63 or cap C13, but wanted to know if anybody has experienced this
sort of behavior before I go swapping stuff out. Oddly, a friend of mine
with his own MG1 is having the same problem, so if anyone has any thoughts
on the matter, y'all could make me look really cool in front of my friends
if i can get this fixed. thanks!
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