[GreenKeys] 28ASR "T" mode problem

[Nick England]

It is MECHANICAL, not electrical. Read the 28ASR manual. Read the 28ASR
training documents. Watch my 28ASR video. In T mode the keyboard signal
generator clutch is supposed to be NOT TRIPPED, meaning the generator stays
marking while the keyboard/perforator is triggered and reset mechanically.

I may be crazy but this is not my first rodeo.

And karma being what it is, I am sure I will have to eat all or some of my
words…….

Nick England K4NYW
www.navy-radio.com


On Thu, Feb 29, 2024 at 6:50 PM W2HX <w2hx at w2hx.com> wrote:

> I am really not familiar with this stuff, but I do recall there is a
> micro/limit switch on the K/KT/T mechanical knob shaft. I wonder if that is
> involved in this (ie to short the keyboard)? Have you checked that switch?
>
>
>
>
>
> 73 Eugene W2HX
> My Youtube Channel: https://www.youtube.com/@w2hx/videos
>
>
>
> *From:* greenkeys-bounces at mailman.qth.net <
> greenkeys-bounces at mailman.qth.net> *On Behalf Of *Nick England
> *Sent:* Thursday, February 29, 2024 5:43 PM
> *To:* Greenkeys <greenkeys at mailman.qth.net>
> *Subject:* Re: [GreenKeys] 28ASR "T" mode problem
>
>
>
> 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
>
>
>
>
>
>
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