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

[Eric & Jia Bigham]

Hi,

Last email - I’m going to be so dead tomorrow for work ~o~; ~…

With my ohm meter, I’ve traced a good circuit from the DC input terminal from the outside to C3, where it stops - as seen here (Filter Z-1, page 2):…

http://www.virhistory.com/navy/manuals/tty/jh/ttyman9/drawings/military/19x02.pdf

What is this C3???  It looks to be ceramic (doesn’t look original)… can’t get an open or somewhat open circuit past it.  Also, I’ve followed the circuit along the other path past the honkin’ R5-A/R5-B resistor to the K-201 Relay, as seen the same page of the diagram-manual above… up to pins 7 and 5.  Not sure if I am able to get anything past this on pins 1, 4 or 2 (I can’t)… this may or may not be a trouble spot, too ;o .  I know I'm bypassing the line relay already, so maybe this isn’t relevant to my trouble ;o .  Again, what is C3 ;o ???

Cheers ^_^ ~

(P.S.:  Sorry, hope I’m not being too annoying here ;o ~….. also, for reference, I blew something on the line loop, so am trying to trace down the trouble here ;p ~)


> On Nov 10, 2016, at 7:36 pm, Jim Haynes <jhhaynes at earthlink.net> wrote:
> 
> 
> Attached is a schematic of one Bell System Model 19 set.  It may not be
> exactly what you have either - but it shows the Line/Test key circuitry
> on the keyboard.
> 
> You could take the typing unit off the base and they keyboard out of the
> base and the motor unit off.  That makes it easy to toss the base around
> while tracing wiring.  Note the contacts marked "Line closing Jack"
> connected across the selector magnet that are operated by an insulator
> on the bottom of the typing unit.  Note also the contacts on the keyboard
> slip connectors on the base.  You can use pieces of paper to hold these
> contacts open while you are tracing wiring, to see if what you have
> is anything like the schematics you have.  There may also be a switch
> operated when the relay is removed from its socket, to keep the line
> closed when the relay is removed.<P38.321.pdf><P38.322.pdf>