[GreenKeys] Mod 28 KSR keyboard problem
John, W9DDD
w9ddd at tapr.org
Tue Apr 2 12:40:25 EDT 2024
OK, I see that the MX 1114A vs. C may be the result of a field applied
modification kit where the A plate didn't get removed after the C plate
was applied. My bad. Read too fast and didn't notice the base number
was the same. I was off on a tangent thinking some electronics had been
applied for low level signally.
On 4/2/2024 11:27 AM, John, W9DDD 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
>>
>> ______________________________________________________________
>> 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
>> <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
>> <mailto:navy.radio at gmail.com>
>>
>>
>>
>> ______________________________________________________________
>> 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 w9ddd at tapr.org
>
--
---
----
The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD
More information about the GreenKeys
mailing list