[GreenKeys] Information on TT-253A/UG (M28 typing perf/reperf)

[Gregory W. Moore]

Good evening, all

I have recently come into ownership of a TT-253A/UG  (M28 combo typing
Perf-Reperf).  Now, this particular unit is a
full chad reperf and keyboard combination.  ( Kbd base: LTRK1ARN ,
Perf/Reperf: LPR53AWA).  A picture of the unit is attached, which was
taken prior to my acquiring the unit.

It is presently geared for 100 WPM.  I would like to know if someone has
the schematic for the unit, or at the very least, the input connector
configuration, as well as the twin terminal board pinouts.  The unit, at
some point, was modified, very nicely, with a homebrew loop supply,
which works perfectly.

I am not particularly concerned with the Perf/Reperf assy connector and
pinouts, unless they are different from a standard reperf, but the
interior wiring is of interest, as I have to do some figuring out what
mods have been made, as it appears a T/R switch was retrofitted at some
time, possibly around the same time the loop supply was fabricated. This
T/R switch works great, but apparently, the keyboard and the perforator
are not connected  to each other, as both will work, but I can't use it,
at least at this time, as a perforator unit.  The unit, as far as can be
seen from a cursory exam and powerup, works just fine, and does lock up
nicely instead of running open.

I really don't need a full schematic, if I can get the basic info on the
terminal strips, and also the interior lamp connections, as well as the
end of line/low tape indicators.   I would also be interested in
obtaining some gearsets for 60 and 75, and wonder if there is a
gearshift assy which would work with this.

Any and all info concerning this will be greatly appreciated.
  73 es tnx de Greg WA3IVX / NNN0BVN
NNNN

-- 
"All that is necessary for the triumph of evil is that good men do nothing."
                                                    --Edmund Burke

Greg Moore NNN0BVN PA
U.S. Navy-Marine Corps Military Affiliate Radio System (MARS)
Official Pennsylvania Area Website:
http://pages.prodigy.net/nnn0fbk/mars.htm
Official Northeast Area Website:
http://www.navymars.org/northeast/index.htm
Navy-Marine Corps MARS: Proudly Serving Those Who Serve."
E-Mail (MARS) nnn0bvn@navymars.org
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