| I've serviced an M3 (very similar, mechanically) in the past &
other than vacuuming out the insides & re-oiling it, there probably
isn't a whole lot that you can do with it. The M3's & B3's have
mechanical tone generators. These are more like guitar pickups /
strings (in concept) than you might expect. If you crack open the
motorized section, you'll find a metal wheel for each tone, and
that wheel was molded with teeth on the outside edge. Each note
has a different amount of teeth on it, and as these spin around,
the pickup near the teeth will convert the magnetic variations
in the pickup caused by this motion, in much the same way a guitar
string causes a guitar pickup to generate a voltage. If these
wheels are loose, or bent, or slightly out of position, you can
get notes that appear out of tune. I've corrected loose ones on
an M3, and it's a Bitch to get the mechanisum apart and back together
again. There are more wires than I care to worry about that you
have to disconnect & re-solder (the wires were all black in the
M3 - so I was glad that I marked everything). The M3 sounds great,
so, I considered the effort worth it, but, I don't plan to go into
business doing this. I also tossed the amplifier & case for this
monster & put it into a new cabinet. This reduces the weight by
at least 150 lbs.
Jens
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