[GreenKeys] {Spam?} Re: Model 15 Bringing Back to Life.2

[Harold Hallikainen]

> Hello All...
>
> My Model 15 is now all cleaned up and "works" when connected to AC. I
> believe it is in receive mode because the carriage moves across without
> hitting any keys and it stops at the end without returning. I am not
> hooked up to the HAL ST-6 yet although it (the HAL) does power up without
> blowing any fuses! I've read that the two wire AC wiring should be
> changed over to 3 wire. I suppose the ground should just connect to a
> chassis screw.  There are two pairs of wires that come from the
> connection block on the right hand side of the teletype. One pair is
> colored green and yellow, the other is dark blue (black) and yellow. I
> need help sorting out the wiring.  Thank you in advance for all your
> advice. Already I have taken great steps in bringing this machine back to
> life due to GreenKeys
> help. Bob... _____________________________________________________________

One pair is probably the keyboard, and the other the selector magnet. I
don't recall what the selector magnet resistance is, and it will vary
depending on whether the magnet coils are in series (pulling 60 mA,
holding 20 ma) OR parallel (holding at 60 mA). But, I'd guess 50 to 100
ohms. The pair connecting to the keyboard should be zero ohms and pulse to
open when you press a key.

When you power it up without a loop supply, the machine "runs open," but
the carriage should not be advancing. If it does, there may be an issue.

My notes are at:

https://w6iwi.org/rtty/tu170/ Notes on TU=170, but includes info on
flyback voltage limiting, etc.

https://w6iwi.org/rtty/ General RTTY notes

https://w6iwi.org/ General station info.

I am currently using a model 15, 14 TD, and 14 reperf (though they are in
storage for a move from CO to AZ). This is the same setup I used in high
school a little over 50 years ago. I love the combination of equipment!

Harold
https://w6iwi.org



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