[GreenKeys] 28 ASR running open

[Sarah Autumn]

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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