[GreenKeys] Repair help on ATD-233 (model 33 ASR) [Richard Barrow]

[Richard Barrow]

I forgot to attach my photos

On Mon, Jan 30, 2023 at 1:37 PM Richard Barrow <richardbarrow.29 at gmail.com>
wrote:

> Thank you guys so much for the assistance. The training manual I've found
> on the retrowagon as well as Curious Marc's videos has been instrumental to
> furthering my understanding of this machine, I appreciate the references.
> This machine is an ASR and as a result there is chaff everywhere in the
> machine. There is a bit bucket that seems to work surprisingly well built
> into the carrying caddy.
>
> The first problem I intend to troubleshoot is the output of random
> characters while in Local mode the selector coil seems to vibrate when the
> switch is both in the off and local position. I haven't put an
> oscilloscope on it but It sounds like a 60hz square wave leading me to
> believe It may be a filtering issue in the power supply. In line mode it
> seems to be working, running open when the modem is unplugged and remaining
> silent when plugged in and the distributor actuating for one cycle when I
> type a key. I will have to consult the wiring diagrams and test the outputs
> on an oscilloscope.
>
> I was planning on buying the serial converter from DeRamp as I have bought
> a few other of his products and I'm very happy with them.
>
> Will the shipping screws impede the operation of the printer mechanism?
>
> On Mon, Jan 30, 2023 at 11:30 AM WAYNE <teletypeparts at comcast.net> wrote:
>
>> Richard,
>>
>> Welcome to the group!
>>
>> Curious Marc is a good site to watch.  He goes into great detail.
>>
>> Another site is the wiki site set up by Jeff Albrecht for me and new
>> owners.
>>
>> https://wiki.theretrowagon.com/wiki/Teletype_Model_33
>>
>> Less detail than Marc's but some helps.
>>
>> Main thing to remember is most 33 issues can be found by VISUAL means.  A
>> lot of looking.  Congealed grease and oil is common in machines not run in
>> a long time.
>>
>> Dont take the keyboard apart!
>>
>> Some pics of your machine might help.  I am guessing its a KSR, no tape
>> punch or tape reader.
>>
>> Also if its portable the printer is likely held in by its shipping
>> screws.  Normally the printer is help in by gravity alone.  It sits in 4
>> rubber mounts.
>>
>> Send some pics and make no adjustments.
>>
>> 73,
>>
>> Wayne
>> KB1FDW
>>
>
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