[GreenKeys] 28ASR

Tue May 12 15:03:10 EDT 2020

I have sent John some info on connections inside his WU 28ASR. I don't have
a complete wiring diagram, but have notes from when I traced all the wiring
in my WU unit some years ago.
I am guessing that he needs to jumper the TD signal contact connections if
it isn't plugged in. The keyboard transmitter, TD transmitter, and polar
relay are all in series. In local (TEST) mode, the polar relay is bypassed
but the keyboard and TD are still in series with the typing unit selector
magnets.

Sometimes I think the Teletype publications group was run like a
super-secret govt project - each group wrote about its own little piece,
but no one knew how it all got connected together.......except for the
document package shipped with each machine which was always discarded
within two weeks.

For understanding how the pieces of an ASR work, I like these USAF FGC-58
training manual chapters
(thanks to James Tanton)
http://www.navy-radio.com/manuals/tty/28_pagetyper_USAF.pdf
http://www.navy-radio.com/manuals/tty/28_td_USAF.pdf
http://www.navy-radio.com/manuals/tty/28_reperf_USAF.pdf

Any document that includes phrases like the following is OK in my book:
"Do you remember the first time you watched a Model 28 page typer in action?
Can you recall your reaction to the sight of this mass of jumping junk?
Didn't you expect it to fly apart-and weren't you disappointed when it
didn't?"
and
" As with the page typer, one wonders how this collection of madly
oscillating levers and quivering
springs can remain together and perform so flawlessly - which it will do if
accorded proper maintenance."

For general reference on the 28ASR, I find the Navy manuals pretty good -
mostly reprints of Teletype publications, but sometimes they do a little
better job of leading you onward rather than letting you find your own way
through the thicket of info.
http://www.navy-radio.com/manuals/tty/28ASR-0967-LP-625-5010-7901.pdf
http://www.navy-radio.com/manuals/tty/28ASR-0967-LP-625-5020-7901.pdf
http://www.navy-radio.com/manuals/tty/28ASR-0967-LP-625-5030-7901.pdf

Nick England K4NYW
www.navy-radio.com

On Mon, May 11, 2020 at 11:23 PM John Hargett <kg5ylg at austin.rr.com> wrote:

> Hello all,
>
> Have been lurking and reading for quite a while.  Picked up a couple of
> teletypes last year from Paul and finally getting around to working on
> them.   Have been able to get all of the gunk out of the mechanical s,
> (28ASR) and have everything lubed.  Trying to find diagrams and info on
> the units, a lot of info to sort thru on the web pages.  If anyone can
> point me in the right direction to what might pertain to the items I
> have would appreciate it.
>
> 28ASR
>
>      The type/perf is working , but get nothing from the typing unit,
> also the type unit was missing one of the hold down screws and locating
> pins, have machined a locating pin and came up with a hold down screw of
> the right thread, but the type unit seems to have uneven mounting legs
> as it rocks on 3 of them and I dont want to tighten it down and put
> anything in a bind. Have not mounted the trans/dist back in the base as
> of yet.
>
>
> The LESU is a WU Tel co 9797-B
>
> Keyboard unit is LAK3ARJ  SN 26949
>
> Type unit   model # is scratched out, not readable, possible LT2CRXXA8
> or 48,  sn 81935 has a repair tag 10/2/78 level 3
>
> Trans/Dist   LXD4 sn 78103
>
> TD Base LCXB8   sn 42342
>
> Type Perf  LTPE 1 ARS     SN 22244
>
>
>   The model 15 I picked up needs a good cleaning, hooked it up to a TU
> and connected to IITY  and was receiving and copy but no CR, dont know
> why I stopped on that one and delved into the ASR ( partly due to  I
> remember by Dad on a KSR all the time at work) .
>
> Thanks again in advance, many projects to go.
>
>
> 73
>
> John
>
> KG5YLG
>
>
>
> --
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