[GreenKeys] questions about the Model 15 wiring diagram/schematic

[paul at paulnewland.com]

I'm new to this forum and hope I'm submitting this in the correct manner.
Apologies in advance if I've done it the wrong way.


I have some questions about the schematic for a Model 15 TTY.   I have a
Model 15 and it runs pretty well, but I'm a small-signal person and don't
understand some aspects of the schematic, and hope people here can clue me
in a bit.



First, here's an schematic (or section of the schematic) that I've
annocated....  http://ad7i.net/images/model15schematicannotated-4.jpg   I've
circled sections of the schematic of interest to me and given each a letter
designation for discussion purposes.



In section A looks to be the business portion of a relay, but I'm not
familiar with this type of schematic representation of a relay.  What's the
meaning of the narrow loop that comes from the left?  Is that suppose to
represent the coil of the relay, and its DC resistance is 355 ohms?  What's
the meaning of the wider loop coming in from the top?  If that represents
the relay's contacts then what part of that loop represents the NO, NC and
swinger contacts?  Also, what's the purpose of this relay?



In section B, does the switch represent the front panel (right side) on/off
switch?



Is the capacitor at C the motor start capacitor?  Do these ever go bad?



Is the FUSTAT at D the Edison socket fuse at the back left side of the base?



At E is a connector going to something labeled "motor contacts".  Don't
really understand what's that's about, since there appears to be a
connection (short/shunt) between the left side of contacts 9 and 10 on that
connector.  Physically where is this connector with pins number 9 & 10 in
the TTY?



At F what's the intended use for the "receptacle"?



I'll be very grateful to whatever insights people might have to offer on
these issues.



73,



Paul, ad7i
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