[GreenKeys] ASR 33 with strange symptom

[John, W9DDD]

Hi Bill,

I don't have a 33, but I like to speculate based on limited last century 
experience with a 33.

The punch just operates from the same code bars the printer does.  So 
they should do the same thing unless there is a specific issue internal 
to one or the other after the code bars.

You say you have two 33s, have you connected them to where they talk to 
each other?  I would think that would help isolate the problem.  I 
forget, is the UCC6 the private line version or Telex?  If Telex that 
becomes complicated, I guess.

The reader is more independent from the keyboard than the punch if from 
the printer.  Do you get same results from both assuming a good tape?  
If so then I think that points to the printer, and I'd lean towards a 
selector area problem.

Is it a random problem or constant?  If you type alternating SG (I think 
that's the ASCII equivalent to RYs)

Perhaps you've gotten the same from direct emails, but I thought I'd 
throw them out anyhow.  Some times my rambling triggers an idea in 
someone else that's useful.

---
----
You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 1/12/2023 10:36 PM, B Degnan via GreenKeys wrote:
> Hi all - A while back I wrote about an ASR33 with a printer issue and 
> I am still working to resolve.  The symptom is that 5th and the 8th 
> "channel" are always punched or printed, vs. what was intended to be 
> typed). When I punch two papertapes from one good teletype and the 
> problem teletype, I can overlay the tapes to see what's happening.  A 
> tape of each key on the keyboard in succession (QWERTY...) shows the 
> effect.
>
> I can use a screwdriver to hold in place to "block" the associated 5th 
> bar that is misfiring and in doing so I can get the linefeed character 
> to print / punch correctly.  That trick does not fix all problems though.
>
> It appears that what's sent to the printer is the same incorrect codes.
>
> I have carefully removed the printer from the chassis to inspect the 
> underside of the printer.  I have compared and contrasted with a 
> working teletype.  I did not see any obviously misaligned springs or 
> bars.  It's a pretty clean machine too.  I have swapped the UCC-6's 
> with no effect.   I have verified mykeyboard against the photos Wayne 
> sent me to verify that the keyboard was ok - At least the thin metal 
> pins are all in line.  I have disconnected the reader to eliminate 
> this variable.
>
> I read the suggestions from the last time I asked about this machine 
> but none lead to a solution.  There could be a weak spring or a stuck 
> metal bar or a code bar out of place I did not notice.  Not easy.
>
> I recognize that I will need to continue to drill down into the 
> machine and as I have time I will keep working on it on this end, but 
> I thought I'd at least report my progress because I got a few replies 
> to my initial inquiry this past summer. If there a spot on the 
> teletype that I could photograph to help one of you help me diagnose 
> the cause of this problem I would be happy to post them someplace.
>
> Thanks and best wishes.
>
> Bill Degnan
> kennettclassic.com
> Kennett Square, PA
>
>
>
>
>
>
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