[GreenKeys] 28 TD questions

[Don Robert House]

You need the documentation to make sure the right parts are available 
to you or you will wind up with two non working units.   I know where 
my depot manuals are for a 28 ASR.  I think I can find what you need. 
=46or some unknown reason I still cannot locate the GDC 101D manual.

Don






>Hi folks:
>
>I have an M28 TD standalone unit (TT-603/UG) that I'd like to get working.
>I connected AC and the motor turns the mechanism just fine.  When I use a
>plastic rod to push the "run" solenoid gizmo, it feeds paper tape and I can
>see the sense pins coming out etc.  I have two problems though:
>
>First, I only see three of the five sense pins come up, so something is
>broken inside.  I have a spare LXD37 reader mechanism (serial 15!) that
>looks in decent shape, but I can't just swap the LXD out since the
>driven-shaft/gear portion is different.  I think I can either swap the
>driven-shaft parts, or the sense pins parts, whichever is easier.  Anyone
>have words of wisdom on dismantle and reassembly?
>
>Second, I have no documentation, so I am curious about the wiring.  There
>are two 9-position terminal strips inside.  The lower strip has AC
>connections for the line cord, internal power switch, and chassis ground --
>this was easy enough to figure out.  The upper terminal strip has
>connections to what appears to be two shielded-twisted-pair wires, with all
>six connections available.  These wires go to a delta connector underneath
>the LXD reader mechanism.  I presume one of these cables provides a
>low-voltage supply for the run solenoid, and the other one looks like it
>goes to a switch. Then there is what looks like another
>shielded-twisted-pair cable that is terminated in a 3-pin circular
>(mil-type) connector -- I presume this provides the data switch contacts
>for the loop.  I can likely figure this other stuff out as well, but if
>someone knows connection information, I'd appreciate it.  Specifically,
>what voltage does the run solenoid need, and what loop voltage are the data
>contacts rated for?
>
>thanks,
>
>gil
>
>
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-- 
--------------------------------------------------------
Don Robert House, N.S.E.
Curator, NADCOMM
North American Data Communications Museum
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