[GreenKeys] ASR33 Typing by itself at powerup

Wed Sep 8 14:15:33 EDT 2021

 Wow! Curious Mark uses a curve tracer to check his transistor at 9:16!That's pretty darn curious! LMAOAnd all these years I have just been using diode check on my multi-meter.
-Steve
    On Wednesday, September 8, 2021, 02:02:55 PM EDT, Michael Katzmann <vk2bea at gmail.com> wrote:  

 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”

______________________________________________________________
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 vk2bea at gmail.com

-- 
   |\      _,,,---,,_             Michael Katzmann
   /,`.-'`'    -.  ;-;;,_         NV3Z / VK2BEA / G4NYV
  |,4-  ) )-,_. ,\ (  `'-' 
 '---''(_/--'  `-'\_)
______________________________________________________________
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 raleigh_ranger at yahoo.com  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20210908/7195e144/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/20210908/7195e144/attachment.png>