[GreenKeys] 28KSR initial checkout videos

[Nick England]

Quick checks when you bring home a filthy Model 28.
Don't turn on the motor until you are sure that nothing is binding and that
you have cleaned and lubricated everything!

My videos are as crude and dirty as this teletype. I probably left out some
things and/or made errors, but I've written down this procedure for 3 or 4
folks and figured videos might help.

part 1 - https://youtu.be/-6UK3VteROc
keyboard/base - make sure the keyboard drive shaft turns and the code
levers and transmitter work. And check that the motor turns!

part 2 - https://youtu.be/rR7eGtEcSgQ
typing unit - make sure that the main shaft turns and that the typebox
moves OK.

part 3 https://youtu.be/4p4V3xw1FFM
complete unit - make sure that the motor, typing unit, and keyboard all
mesh and cycle.

part 4 - https://youtu.be/-O2EhrZje1o
low low speed checkout - hook up a loop supply and turn the motor by hand
to type and print characters in very very slow motion. Verify that your
keyboard transmitter is operating properly and that your typing unit's
selector is operating properly.

Don't turn on the motor until you are sure that nothing is binding and that
you have cleaned and lubricated everything!

Good Luck and Have Fun,
Nick K4NYW
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