[GreenKeys] ASR33 Typing by itself at powerup

Wed Sep 8 18:12:41 EDT 2021

 Peter,
Most (maybe all) meters require you to unplug the red lead from the voltage/ohm readingplug and put it into the amp reading plug.When reading amps your meter is a short circuit.That is why you never put an amp meter across a power supply.You would short it out.An amp meter has to be in series with the load.-s

    On Wednesday, September 8, 2021, 04:02:15 PM EDT, Peter Mantos <pmantos at swcp.com> wrote:  

 Yes, stick a gun to my head and I'll recite Ohm's law. Hell, I've got a fair shot at Boyle's law.  
But in practice, no, I don't know diddly, so dont assume I know anything.   I appreciate the advice and especially the warnings.
Peter

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: steve bennett <raleigh_ranger at yahoo.com> Date: 9/8/21 12:23 PM (GMT-07:00) To: greenkeys at mailman.qth.net, peter at mantos.com Subject: Re: [GreenKeys] ASR33 Typing by itself at powerup 
 Peter,
 Forgive me but I do not know what your knowledge level in electronics is but....To check mA your meter must be connected in series with the loop.NEVER put an amp meter across the terminals of a power source.
Sorry just making sure you knew that.
-Steve
    On Wednesday, September 8, 2021, 12:48:19 PM EDT, peter at mantos.com <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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