[GreenKeys] ASR33 Typing by itself at powerup

[peter at mantos.com]

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
<mailto:greenkeys-bounces at mailman.qth.net>
<greenkeys-bounces at mailman.qth.net
<mailto:greenkeys-bounces at mailman.qth.net> > On Behalf Of peter at mantos.com
<mailto:peter at mantos.com> 
Sent: 08 September 2021 02:33
To: greenkeys at mailman.qth.net <mailto: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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