[GreenKeys] Update on my open M15 Selector Magnet

[hwhall at compuserve.com]

That's kinda good news, in that the problem is in the outer layers of the windings & probably not that hard to fix.

WayneWB4OGM

-----Original Message-----
From: ad7i <ad7i at ad7i.net>
To: greenkeys <greenkeys at mailman.qth.net>; John, W9DDD <w9ddd at tapr.org>
Sent: Tue, Oct 6, 2020 2:46 pm
Subject: [GreenKeys] Update on my open M15 Selector Magnet

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.



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