[GreenKeys] 28ASR Locked Keyboard

[John, W9DDD]

Good morning,

Yes, you have the Synchronous Pulsed Transmission modification kit.  I 
had that on a KSR keyboard.

Look in 573-117-800 
(http://www.navy-radio.com/manuals/tty/573-117-800-7009.pdf) on page 35. 
There is part number 193654 on the right side of the page. That is 
supposed to be able to disable the feature by rotating it.  I don't 
remember in which direction.

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The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 6/17/2021 1:11 AM, Robert Goff wrote:
> Hi,
> I've been working on a 28ASR, which is in excellent cosmetic
> condition, but has a few bugs still to work out. Most obvious of
> these-you can't type on the keyboard.
> 
> Hunting around I found a solenoid behind the character counter.  If I
> hold down the armature the keys move freely, but let it go and I can
> type exactly one character. Could not find the solenoid in any of my
> drawings, it doesn't look like the lock switch shown in the manual.
> 
> Someone told me that machines used with crypto equipment needed a sync
> pulse to unlock something after each character.  Maybe that's what
> going on here?  Anybody run into this before? The perforator base is
> marked TT-433, so at least that and the reperforator are military.
> 
> Thanks,
> Robert
> W7MKA
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