[GreenKeys] ASR33 Typing by itself at powerup

[Michael Katzmann]

Have a look at Curious Marc's debug of exactly your problem ... you can see
where he checks the magnet and circuit.
https://youtu.be/QzfjT1mCRww?list=PL-_93BVApb5-84G5kmgfuu7TQduTMc73H&t=436

Michael

On Wed, Sep 8, 2021 at 12:48 PM <peter at mantos.com> wrote:

> Thanks for all the responses.  Yes, Wayne was kind to send me a couple of
> rubber pads for the hammer.
>
>
>
> I’m not very familiar, but I seem to have all the diagrams and schematics
> and yes, I see the FS3 schematic.
>
>
>
> My problem is associating the schematic with the physical parts and the
> schematic.
>
>
>
> When I am asked to measure the 20ma, I have no idea where to connect the
> volt meter.
>
>
>
> It looks like I’ll have a lot a reading to do to get familiar.
>
>
>
> Yes, I have taken out the H plate during my “repair” and have placed it
> back.  I’ll look for that adjusting screw.  I not that with the H out, and
> the power on, I can manually move the conection to the H plate (the left
> side with the spring while looking at it from the front), but it keeps
> chattering.  The change in moving the spring side connection with a
> screwdriver is that a wheel on the right side rear that has three “fans”
> stops spinning and a clicking noise associated with it ceases.
>
>
>
> Let me do some reading and I’ll get back to you.
>
>
>
> The advice is definitely appreciated.
>
>
>
> Thanks,
>
> Peter
>
>
>
> *From:* dave.g4ugm at gmail.com <dave.g4ugm at gmail.com>
> *Sent:* Wednesday, September 8, 2021 2:29 AM
> *To:* peter at mantos.com
> *Subject:* RE: [GreenKeys] ASR33 Typing by itself at powerup
>
>
>
> Peter,
>
> Just make sure the rubber hammer is in good condition. Its far too easy to
> destroy the print head. Some one on here has replacements.
>
> Dave
>
>
>
> *From:* greenkeys-bounces at mailman.qth.net <
> greenkeys-bounces at mailman.qth.net> *On Behalf Of *peter at mantos.com
> *Sent:* 08 September 2021 02:33
> *To:* greenkeys at mailman.qth.net
> *Subject:* [GreenKeys] ASR33 Typing by itself at powerup
>
>
>
> 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”
>
>
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-- 
   |\      _,,,---,,_             Michael Katzmann
   /,`.-'`'    -.  ;-;;,_         NV3Z / VK2BEA / G4NYV
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