[GreenKeys] OT: Silent 700 model 725 service/maint manual?

[Chris Elmquist]

On Tuesday (07/08/2014 at 02:52PM -0400), COURYHOUSE at aol.com wrote:
> OK I  will  keep an eye out.
> We do not have anything
> here at the museum on them 
> ( I am surprised....actually)

OK. Thanks Ed.  I appreciate it.

There were really three families--   the 72x such as I have referenced,
the 73x (which many folks remember as having dual data cassette drives
mounted above the printer), and the 74x which were the more "modern"
briefcase and truely portable units.

The 72x and 73x have no microprocessor and are all discrete logic on
plug-in cards in a card cage at the back of the unit.

The 74x used an 8080 microprocessor to replace most of the discrete
logic and also used a much smaller printhead.  Some of the 74x line could
also do "lowercase" by simply printing smaller uppercase characters ;-)

We can run them today using thermal FAX paper which you can still get
at office supply stores.  The rolls are smaller but it's the same paper
and works great.

But, as you note, the printhead is the most precious part and once that's
toast, the rest of the machine becomes a parts donor.

Chris

> In a message dated 7/8/2014 11:49:49 A.M. Mountain Standard Time,  
> chrise at pobox.com writes:
> 
> On  Tuesday (07/08/2014 at 02:43PM -0400), COURYHOUSE at aol.com wrote:
> >  CHRIS>   _www.bitsavers.com_  (http://www.bitsavers.com)   should have  
> one!
> 
> Thanks  Ed. I've been down that path already as well as fairly extensive,
> in-depth  web searching.  The closest I've gotten is a maint manual for
> the 73x  series which is sufficiently different than the 72x series as
> to not  apply.
> 
> I'm pretty sure I need to find one in someone's file drawer or  on their
> bookshelf.
> 
> > I remember those terminals!
> > Hope  your print head is still live....
> 
> It is!  On both  machines!
> 
> I've also got several model 745, which are the smaller  briefcase sized
> (as opposed to suitcase sized!)  models and those are  working A-OK too.
> 
> Chris
> 
> > In a message dated 7/8/2014  11:36:14 A.M. Mountain Standard Time,  
> > chrise at pobox.com  writes:
> > 
> > Slightly  off-topic but not too far.  I am  trying to track down a service
> > or  maintenance manual for the  Texas Instruments Silent 700 model 725
> > thermal  printing  terminal.
> > 
> > It's like one of  these,
> > 
> >  
> https://drive.google.com/file/d/0B6A73VHTVh23OVFBTG9aUHdtX0k/edit?usp=sharin
> >  g
> > 
> > and  specifically the one in the suitcase.
> >  
> > I have a couple and have been  keeping at least one running  since 1975.
> > I've never had a service manual or  any documentation  with any technical
> > content, parts breakdown, schematics,  etc.  and so I am trying to find
> > such for the collection here.
> >  
> > The  keys are actually green on the 725 so I'm not too far out  in the
> > weeds for  this list ;-)   I was thinking that  folks who have worked in
> > the  teleprinter world may have  encountered these and possibly nabbed
> > and saved  a service  manual.
> > 
> > I would like to borrow and scan it or make a  deal  with you to purchase.
> > 
> > Thanks,
> > 
> >  Chris N0JCF
> 
> -- 
> Chris  Elmquist
> 
> 

-- 
Chris Elmquist