[GreenKeys] Update on my open M15 Selector Magnet

[ad7i]

Well, this is a little embarrassing.  As you may recall, I found that one
of the two selector magnets on my Model 15 TTY had gone open, and I had
speculated on some of the possible causes.

It now appears more likely that the magnet is open due to a divet in the
side of the magnet.  I've had this TTY for about 25 years and I don't know
if I received the TTY this way, or if this was something I managed to do
while it was in my care.

The good news is that the machine does seem to print fine with just one
magnet working, and the power dissipated by the one magnet at 60 mA of
current is slightly less than 350 mW, which isn't all that much.
Additionally, a temperature check with my index finger doesn't indicate any
heat from the working magnet.

Below is a photo of the divet; I can't imagine how I missed that.

[image: m15-magnet-divet.jpg]
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