[GreenKeys] ASR33 Typing by itself at powerup

[Doug Jackson]

Hi Peter,

I am going down a similar path to you with my own ARS-33, and have
discovered that every time I remove the keyboard, I have to be very careful
to get the H block connecting the keyboard to the printer mechanism right
as well as ensure that the keyboard is physically in the correct location.

Because you commented about taking springs off the bottom of the keyboard,
and cleaning them  I am assuming you removed the keyboard. If the physical
alignment of the keyboard is out on the baseplate, then the mechanical
keyboard reset stays tripped and it keeps the distributor tripped,
resulting in constantly chattering as if the loop was open irrespective of
being in online or local mode.

There are a couple of prople on the web who have documented this:   person
named REVK identified this in his blog:
https://www.revk.uk/2020/12/asr33-restoration.html  and there is also an
entry here : https://wiki.theretrowagon.com/wiki/Teletype_Model_33

You will find that the Teletype manuals are amazing resources. There is an
awesome adjustment manual located at
https://www.soemtron.org/downloads/teletypes/model33bulletin310bvol2manual1974.zip

Section 2.16 talks about the Distributor Trip Linkage - Essentially, there
is a small set screw that if you need to adjust it, moves the location of
the H Plate to cope with the new location of the keyboard.  Alternately,
loosen the keyboard hold down screws, and move the keyboard slightly to see
if it stops chattering.

Good luck and have fun.  Today I will replace a faulty clutch in my
distributor.


Kindest regards,

Doug Jackson

em: doug at doughq.com
ph: 0414 986878

Check out my awesome clocks at www.dougswordclocks.com
Follow my amateur radio adventures at vk1zdj.net






On Wed, 8 Sept 2021 at 11:33, <peter at mantos.com> wrote:

> I have a couple of ASR33 Teletypes and would like to get one working.
> When I turn on the primary machine to either line or local, it “types” what
> seems to be a null character repeatedly.
>
>
>
> As a bit of history, I had to do some work on my papertape power supply
> which I think I did successfully (although I accidentally touched something
> to it since and got a spark, so who knows?)
>
>
>
> That power supply repair seemed to work OK, but I couldn’t leave well
> enough alone and decided to do a little cleanup.  I ended up taking the
> spring(s) off the bottom of the keyboard, cleaned it, and replaced it.
>
>
>
> Since then, I have had the problem of it “typing” without any keyboard
> input when powered on.
>
>
>
> The reason I think that I have a NULL character is that if I turn on my
> papertape punch while this is happening, I get no holes in the tape except
> for the center sprocket holes.
>
>
>
> Any ideas?  I was thinking about transplanting the “other” keyboard, but
> from what I read, that’s just asking for trouble.
>
>
>
>
>
> Peter Mantos, MBA, MSCS, PMP, CSM
>
> Mantos I.T. Consulting, Inc.
>
> (505) 291-1047
>
> Not just “Know How”, but “Know Why”
>
>
> ______________________________________________________________
> 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 doug at doughq.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20210908/b3ef8204/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 826 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20210908/b3ef8204/attachment.png>