[GreenKeys] Teletype Model 15 power Q's...

[Eric & Jia Bigham]

Hi all,

First, I apologize if I sound simplified in my questions ;o … I’m kind’a still a novice when it comes to circuits ;p (even though I am a ham - general license)… but just want to make sure I have a few things straight before I fire up this Teletype Model 15 that I have - that I got a couple of months ago :) ~...

First of all, I’ve been having trouble finding out how the Model 15 is powered ;o .  I’ve gotten bits-and-pieces from various people on how the machine should be powered, but nothing definitive ;o .  So my questions :) :

1.  I understand that this machine requires both AC and DC power.  Are AC and DC power on separate circuits within the machine?

2.  Do I run AC and DC power simultaneously or separately?

3.  One person has told me that in order to use it in “typewriter mode”, I would need a DC power supply running at about 24-30vdc in order to activate it.  I would also need AC power, correct?

4.  I do have a variable-voltage transformer… do I need anything special in-between the transformer - like fuses, diodes, etc ;o ?

5.  If AC power is required with DC and while running in “typewriter mode”, the machine receives the 60ma loop current through the 120vdc dedicated power connector, correct?

6.  When running off of they line-in (data), the 120vdc 60ma loop current comes from the data line and not the dedicated DC power line, correct?

7.  What should I set the DC transformer voltage to ;o ???  I understand that the voltage requirement needs to be a bit lower than the 120vdc specified.

8.  When rotating the machine 180°, there is a part that has two wires and a few bars (sorry, I’m not sure what this part is called) on the base of the unit - right-near side… similar to what one can find in an old, rotary telephone (in a telephone, it opens and closes the telephone circuit when pressing / depressing the hook on the telephone).  This teletype has the two wires cut from it and I can’t find any documentation on this part ;o … what is it and is it critical ;o ???

9.  What can I use as a substitute oil plug on the main shaft ;o ???  Mine is missing ~o~; ~…..

I’m sorry if some of these questions overlap ;o … I’m just trying to exhaust all of my questions and possibilities - to understand everything before doing anything further :) .  For reference, I have three lines/power lines going into the machine.  An AC power line going to terminals 21, 23 and ground.  Dedicated DC power line going to terminals 24 and 25.  Data line (red jack) going to terminals 32 & 41 with a wire connecting terminals 32 & 42 together internally… not sure how this wiring on the data line effects things ;o .  The motor its 120vac synchronous.

Anyways, simplified explanations please xD hahah - I sometimes can be kind’a dense ;p ~o~; .  Thank you so much in advance for all of your help - I really want to give this a thing a try ;D !

Cheers ^^ !!!

Sincerely,
Eric ^_^