[GreenKeys] Re: model 28

[Don Robert House]

Steve,

There should be keyed plugs from the LESU that will only fit in the 
base and the typing unit.  For machines that were used on telegraph 
switching systems there was a second aux connector on the typing unit 
(with the opposite keying from the main connector) that went to an 
auxiliary terminal strip mounted on the right side inside the 
cabinet.  The connector closest to the frame of the typing unit is 
the main connector, the aux connector does not need to be used.

All of the terminal strips should have individual colored wires going 
to a separate individual binding posts.  The connections for 
different systems were accomplished by the use of different length 
straps.  Sadly all of my manuals and wiring diagrams are in San 
Diego.  When I am there in January I can call you and go over the 
strapping and connections for your unit.  On my way back t Illinois 
in March I could also stop at your place in Kansas City.

I am supposed to have an M28 manual set here but I have not found it 
since I moved.

Some folks just cut off the cables and wired their receive circuit 
directly to the selector magnets.  I do not like that approach.  I 
like to see the machines preserved the way they were designed.

Best regards,
Don

P.S.  I bought a bottle of your family's German wine at our local 
Polish delicatessen:
Schlink Haus  Kabinett  !!!


>Don,
>
>Well here it is a year and a half later, and I'm finally getting 
>situated in KC.
>
>I finished unloading the storage unit into the house, and one of the 
>items was my 28 KSR that is Bell System branded, Unit #1.
>
>One of the things that always had me concerned was that there are 
>two cables coming out of either side of the ESU that have been 
>chopped off.
>
>I have another ESU and base that I salvage from a junk 28 RO let's 
>call this Unit #2
>
>On the ESU of Unit #2, there are 2 cables coming out of each side:
>
>On each side there is a cable with the 20 pin connector that goes to 
>the base and the typing unit, and a spade terminated cable.
>
>On my (Unit #1) The spade terminated cables go to the terminal strip 
>on the inside rear of the cabinet.
>Then there is a chopped cable on both sides of the ESU.
>
>Next, there are two 20 pin connectorized cables from the terminal 
>strip to the base and the typing unit.
>
>It appears to me that the cables were cut and reconnected to the 
>terminal strip, because there are no spades on the ends, just 
>stripped wire ends.
>
>FYI, this unit had the motor start/stop controller.
>
>My thought is to swap out the ESU with the one that has not been 
>"modified". Both have identical model numbers.
>
>I do have a fair collection of manuals for this beast including 
>disassembly, but I think I'll leave that for another time.
>
>Anyway, if you can give me any insight into this cabling issue, I'd 
>appreciate it.
>
>From the docs that I have, there were a number of modifications 
>available for this over the years.
>
>I can post photos of any of this if you like.
>
>Thanks,
>
>Steve
>
>
>At 05:26 PM 1/23/2002 -0800 Don Robert House  wrote:
>>Steve,
>>I am commited to getting your machine running. I retire on August 8.
>>Perhaps a trip East is in order.
>>Don
>
>
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