[GreenKeys] 28 ASR running open

[Sarah Autumn]

Cool, I'll start a pile of documents and then I'll go through them and see
what you don't have. Might take a little while as things in that place are
never where you think they should be...but that's half the fun ;)

Thanks again for your help. I know what you mean about being in awe of
these things. It amazes me that it can work so consistently given the sheer
number of mechanical parts bouncing around inside!

On Fri, Jul 17, 2015 at 9:18 AM Nick England <navy.radio at gmail.com> wrote:

> Excellent - it is always a great feeling when one of these marvels comes
> back to life. I'm an electronics guy so am in total awe at the mechanical
> engineering in these things!
>
> Oh definitely on a list of your TTY manuals. There are many I am missing
> (indicated by "no link") or no entry at all (like 274B - I don't even know
> what that one is).
> http://www.navy-radio.com/manuals-ttycorp.htm
>
> Obviously I have many more to scan as well so anything you can send along
> will be extremely helpful. I am strictly a Model 28 guy so have
> concentrated on them as my top priority.
> Cheers,
> Nick
>
> Nick England K4NYW
> www.navy-radio.com
>
> On Fri, Jul 17, 2015 at 12:04 PM, Sarah Autumn <neverether at gmail.com>
> wrote:
>
>> Hi Nick,
>>
>> Just figured it out late last night. It's funny that you mentioned there
>> are a gazillion different ways that ASRs can be hooked up. I noticed that
>> the previous owner had installed jumper wires across the cabinet terminal
>> blocks, and I suddenly grew suspicious of them. In a fit of late night
>> ambition, I removed them, and wired the keyboard jack from the acoustic
>> coupler onto the correct terminals, and now it works.
>>
>> The mystery is what those jumper wires were doing in the first place, and
>> why it worked previously.
>>
>> Oh, by the way, I wanted to get in touch with you about the manuals at
>> navy-radio! I'm a regular volunteer at the Museum of Communications in
>> Seattle, and I've been digging through our Teletype stuff. We have tons of
>> documentation there, and I was wondering if maybe you wanted me to send you
>> a list of what we have? Maybe we could help fill in some of the missing
>> documents in the collection there, or at least provide higher quality scans
>> if needed.
>>
>> On Fri, Jul 17, 2015 at 7:53 AM, Nick England <navy.radio at gmail.com>
>> wrote:
>>
>>> Not sure how your modem connects to everything, but it sounds like you
>>> have the signal generator wires on a plug that goes into the loop.
>>> So all the signal generator should do is make contact for a mark, no
>>> contact for a space. The rest position should be a mark and then a space is
>>> the start bit.
>>> Sounds like your BREAK key is stuck or a wire is disconnected or the
>>> signal generator contacts have burned - something that causes a permanent
>>> open circuit.
>>> I'd pull the keyboard out of the loop (to make sure there is no voltage
>>> present) and just check things with an ohmmeter.
>>> A) one side of keyboard plug to one side of signal generator
>>> B) one side of signal generator to other side of signal generator
>>> C) signal generator to other side of keyboard plug.
>>>
>>> It's gotta be in there somewhere......
>>>
>>> OH, this is an ASR - which means your TD is hooked up in there
>>> somewhere. Is the TD plugged in?
>>>
>>> There are about 1000 ways that ASRs are hooked up. One wiring diagram is
>>> at
>>> http://www.navy-radio.com/manuals/tty/28ASR_wiring_W0700.pdf
>>> http://www.navy-radio.com/manuals/tty/wd-tty-7015-7016.pdf
>>>
>>> Good luck!
>>>
>>>
>>>
>>> Nick England K4NYW
>>> www.navy-radio.com
>>>
>>> On Thu, Jul 16, 2015 at 9:04 PM, Sarah Autumn <neverether at gmail.com>
>>> wrote:
>>>
>>>> Hey all,
>>>>
>>>> My 28 is running open, and I feel like I'm missing something obvious.
>>>> I'll try to provide a list of what I have, and what I've done...
>>>>
>>>> -Pretty much stock 28 ASR, though it has been modified for the deaf,
>>>> and I provide loop current with an acoustic coupler modem.
>>>> -Previous to last week, it ran without any problems.
>>>> -Runs fine as long as keyboard is not plugged in to the loop. I also
>>>> have an original 100A Teletype Test Distributor, that I've plugged in
>>>> through keyboard plug of the modem, and it works great. The typing unit
>>>> behaves properly.
>>>>
>>>> So I don't think it's the modem. I've checked the signal coming out of
>>>> the contact box / signal generator, but I'm not sure what I should be
>>>> looking for. I get constant voltage on one terminal, and constantly no
>>>> voltage on the other. Hitting keys seems to have no effect, though the
>>>> little wiggly bits inside wiggle nicely.
>>>>
>>>> Symptoms started when I had the typing unit out to work on the stunt
>>>> box. Finally got that how I want it, and when I put the typing unit back in
>>>> for the last time, a wire on the connector must have gotten stuck, and it
>>>> shorted. I fixed the wires, and the TU appears to be fine.
>>>>
>>>> What am I looking for coming out of the signal generator? Am I barking
>>>> up the wrong tree?
>>>>
>>>> Thanks :)
>>>> Sarah
>>>>
>>>>
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>>>
>>
>
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