[GreenKeys] LESU 13

[DR HOUSE]

Jim,

I have a nice copy of 2879 WD which is the actual wiring diagram for  
the LESU 7/134, 151 and associated Model 28 apparatus.
I have no information on an LESU 13, however I also do not know what  
the forward slash indicates in the drawing's title.

I also have a large Western Electric Shops wiring plan in three 11 x  
34 inch sheets for a standard 28 ASR on private line service.  I have  
not scanned this huge document so it would take me some time to do  
it.  With what is on my plate right now I would not be able to start  
scanning for at least two more weeks if anyone wants this set of  
drawings.

Don
K9TTY


On 10 Aug 2011, at 11:25 AM, Jim Haynes wrote:

Seems like the diagrams on rtty.com are readable - at least that's what
I think I was using rather than digging out a hard copy that I have
buried somewhere.

The very early Model 28 sets had three terminal strips of 10 terminals
each.  Later models have two strips of 20 terminals each; and there was
a mod kit to mount two strips in an old cabinet designed for three.
So I guess at some point someone decided that 30 terminals was not  
enough
and went to 40.  On the schematics these are designated C-1 through  
C-40.

The A terminal block is the selector magnet terminal block in the LESU.
The B terminal block is called a line-test-key block in the LESU, but
lots of sets do not include a line-test key.  A and B are at the left
hand end of the LESU as it is installed in the cabinet.

The D terminal block is the motor control block in the LESU, and the E
block is the power terminal block.  These are on the right hand end of
the LESU.  F is the keyboard connector and R is the typing unit  
connector.
S is the motor terminal block on the base or keyboard.

Off the top of my head I don't know what is the difference between the
common LESU7 and the LESU13.

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