[GreenKeys] Mod 28 KSR keyboard problem

Tue Apr 2 12:57:44 EDT 2024

Yeah that's weird - the LP77 is 7.00 and the MX-1114C (LK10) is 7.42.
I don't think the 7.42 keyboard shaft will mesh with the 7.00 drive gear on
the LP77 main shaft
I ran into that on one of my first teletypes -
https://www.navy-radio.com/tty/28asr/rtty-05.htm

Nick England K4NYW
www.navy-radio.com

On Tue, Apr 2, 2024 at 12:27 PM John, W9DDD <w9ddd at tapr.org> wrote:

> Hi Bob, you said you had it for a long time.  Did it ever work or you
> acquired it way back when and this is the first hit on it?  I guess I
> should look up those military numbers, but the reference to a separate
> number for a signal generator seemed kind of strange.  Civilian versions
> only have one reference number for the whole keyboard.
>
> When you say there are 3 terminal strips in the back, are they numbered
> 1-30?  That would indicate a fairly old cabinet.  Yet the LP77 is a
> relatively high number.  Also LP77 would be for 7.0 code, which would
> have a different gear to drive the keyboard than a 7.42 printer.  My
> recollection though is that a 7.0 printer won't sit down properly on a
> 7.42 keyboard/base.  So you probably don't have that mismatch.  (LK25
> was the keyboard that came with my LP77)
>
> But getting back to the signal generator thing,  That's the first thing
> that threw a red flag to me.
>
> Anyhow take the above as being worth what you paid for it.
>
> (this makes me go hmm, my LP77 and LK25 never had any MX number tags on
> them. Strange?)
>
>
> On 4/2/2024 10:38 AM, Nick England wrote:
> > 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 <http://www.navy-radio.com>
> >
> >
> > On Tue, Apr 2, 2024 at 10:52 AM Robert DelGatto
> > <rdelgatt at optonline.net <mailto: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
> >
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> >>>> Jordan Spencer Cunningham's GreenKeys Search Tool:
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> --
> ---
> ----
> The above comments or recommendations are SWAG. Use at your own risk.
>
> John, W9DDD
>
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>
> >>> 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
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