[GreenKeys] What moves the ribbon on a Teletype 43?

[charlesmorris at hughes.net]

Lee, This is a good description provided by "Just Bob"... my problem 
getting the ribbon to advance was caused by a defective ribbon! The 
loop was too long and the spring-loaded arm (at the left side of the 
chassis) ran out of range and couldn't keep the ribbon tight against 
the one-way rollers.

Someone on the classic computers list has actual service manuals for 
the 43 but I don't have copies, sorry. The operator's manual can be 
found online. I agree that the interlock (in the center of the unit 
just above the keyboard) is the first thing to check. I'm away from 
home now so I can't go check but I have a vague memory of connecting 
various modem control pins at the connector too (CTS, DTR?)

However, regardless of mode (line or local) you should be able to hold 
down the Print Test button and it should cycle through all the 
printable characters continuously. If the Interrupt/Alarm is lit I'm 
not sure it will print, make sure the paper is correctly installed and 
the paper-out switch is closing.

-Charles

----Original Message----

The ribbon is merely a continuos loop that passes by a re-inking 
sponge 
roller inside the cartridge.  The ribbon movement occurs when the 
printhead does a "return" as it has one-way rollers that pull the 
ribbon 
in a counter-clockwise loop, but allows the the printhead to travel 
across the ribbon during left to right printing.

There is an inter-lock switch that has to be operated by the white 
cover 
being in place and closed, or the unit will do nothing, and I think 
there was also a paper-out detector, that also will disable the 
machine. 
  Otherwise, the "LOCAL" button/indicator when lit, should provide 
local 
copy from the keyboard, if the unit is functional.

I know that's not much help, but it's all I got!

Would it be possible to disclose your source for the ribbons?  I've 
tried every place I can think of, and have come up empty???

Best of luck!

Just Bob!

Lee Mushel wrote:
> Charles, I think you are someone with coattails I would like to hang 
on to.  You have a model 43.   So do I, one I got on ebay and when it 
arrived, the print head was "floating" around loose, doing all the 
damage it could.   After a couple of months, I found a source for the 
ribbons which arrived yesterday.   I plugged this thing in and got a 
row of red lights but no indication of any desire to do anything else.  
If you are past the point of worrying about getting the ribbon to 
advance you are ahead of me.
> 
> I have no info on it.   Perhaps you can point me in some direction 
so I can download a manual or at least a schematic.
> 
> 40 years ago I had no trouble getting models 14, 19 and 26 working 
(and they sit about 20 ft. behind me at the moment.   But this creature 
is something else.   I would at least like to get it in a "local loop."
> 
> 73
> 
> Lee, K9WRU
> _______________________________________________
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> GreenKeys at mailman.qth.net
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> 




------------------------------

Message: 5
Date: Thu, 1 Jun 2006 23:07:23 -0500
From: Don Robert House <drhouse at nadcomm.com>
Subject: [GreenKeys] Ribbon cartridge needed badly for AN/UGC-74C
To: Teletype Friends <greenkeys at mailman.qth.net>
Message-ID: <C8C80B0F-B57B-4413-A8DC-58EA247733D8 at nadcomm.com>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

I was afraid my message might be misunderstood.  I have several  
cartridges for my Teletype Model 43.  Thanks to you all I now know  
where to get more.

My problem is not the M43, but my AN/UGC-74C which uses a custom  
designed ribbon cartridge which is not available anywhere. It came  
with my machine but was lost in the museum moves.

Thanks to all who replied...
Don

Don R. House K9TTY
drhouse at nadcomm.com




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