[GreenKeys] Mod 28 KSR keyboard problem

[Nick England]

I can’t think of any effect of the typing unit on the keyboard other than
something that would keep it from working at all (like a busted/wrong drive
gear).

Reference -
https://www.navy-radio.com/manuals/tty/jh/ttyman3/TeletypeManuals/model28/Instructional/28_Keyboard.pdf

Please give us more info.
If you type the same character over and over do you always get the same
result?
RRRRRR   YYYYYYY  EEEEEE TTTTTTT
What do you you get when typing BLANK over and over?

Isolate the problem between the code bars, transfer levers, and transmitter
contacts.
You may want to manually rotate the motor to see things in slow motion.
Pull the top of the fan (on the right end of the motor) toward you.

Watch the code bars at the right side-
Type E LF SP CR T yo make one code bar at a time move.
Type E A U K LTR V M O T to make 1 2 3 4 5 4 3 2 1 code bars move together

If the code bars are behaving OK -
Type the same thing while looking at the transfer levers (to the right of
the transmitter contact box)
If they aren't behaving you probably have something gummed up from old
grease or a missing spring.

If the transfer levers are behaving OK you probably have dirty contacts,
loose connection, or a bad noise suppression network (inside the
transmitter box)
Watch a loop current meter as you turn the motor by hand.

Nick England K4NYW
www.navy-radio.com


On Tue, Apr 2, 2024 at 10:52 AM Robert DelGatto <rdelgatt at optonline.net>
wrote:

> Hello all, I have this 28ksr for many years, recently retired and now have
> the time to get it going. Cleaned,
> lubed, and got the receive to print perfect with MPC1000r Dovetron set to
> 60 mils. Transmit another story,
> keyboard works but no inputs will match the outputs, mostly spaces and
> wrong letters. I cleaned contacts
> in the signal generator and made no adjustments to anything on the
> keyboard. I installed a 3 speed
> transmission which works perfectly but still need to make up linkage. The
> printer case is a TT69-70 type
> mounted on the usually base, LSU is SB-964/ug, Typing unit is LP-77yd/agm,
> Keyboard is Mx114a/ug
> with a Mx-1114c/ug signal generator.
> The typing unit has a replacement tag under the model, RO10, probably not
> original plate. I don't know
> that there would be a difference with RO, receive only that would prevent
> the keyboard from working?
> The case has 3 connection strips in the upper rear, I am using 5 and 6 for
> receive, havens gotten to tx
> yet. Any help would be really appreciated.
> Thanks Bob Kc2ltx
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive:
> http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive:
> http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to navy.radio at gmail.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20240402/711141b2/attachment.html>