[GreenKeys] 28ASR "T" mode problem

[Nick England]

Several people have asked if T mode just shorted out the keyboard signal
generator instead of mechanically not tripping it.
No - this is mechanical and not electrical. The perf will cycle MUCH faster
than the printer, so you are not restricted to 60wpm when cutting tape in T
mode like you are in KT mode.
I just made a video of my other 28ASR punching tape in KT and in T modes so
you can see and hear the difference.
It looks like YouTube now does some weird scheduling thing so this may not
be visible until midnight.
https://youtu.be/Nv1skylEaKE

BTW, that switch is for controlling an indicator lamp.

Nick England K4NYW
www.navy-radio.com


On Thu, Feb 29, 2024 at 2:55 PM Nick England <navy.radio at gmail.com> wrote:

> In "T" mode, the keyboard signal generator clutch is not supposed to
> engage, meaning that the keyboard mechanically activates the perf but does
> NOT transmit a signal on the line. This allows you to cut a reply tape
> without interference while the page printer is printing an incoming message.
>
> My problem is that the perf is getting activated/reset fine in T mode, but
> unfortunately the keyboard signal generator clutch is also getting tripped,
> causing the keyboard signal generator to interrupt the signal line. This
> means I can cut a tape OK, but that printing of an incoming message gets
> garbled.
>
> I can't figure out how to adjust  the keyboard control selection lever so
> it does not trip that clutch. The control cam is causing the perf to
> activate/punch/reset correctly in T mode, and I can see that the keyboard
> control selection lever is rotated, but that dang clutch trip lever is
> still tripping.
>
>  Note - I can't actually see the end of the clutch trip lever as it is
> buried in there somewhere.
>  - reference position C on Figure 21 of 573-117-100 - (diagram attached)
>
> Any suggestions? I swear this thing used to work properly but something
> has happened and I can't figure out what.....
> Nick
>
> [image: image.png]
>
>
>
>
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