[GreenKeys] slightly OT: Silent 700 model 787

[Chris Elmquist]

I did discover a command to select between internal modem and the RS232 connection so that is progress.  However I also discovered some significant hardware “rot” that I am now in the process of repairing.

They used some kind of rubber standoffs between the actual printer assembly and the top circuit board.  They basically isolation mounted the printer, presumably to reduce noise, on these rubber mounts.  Unfortunately these mounts are now really lousy looking busted up gum drops with an ugly white fuzz on them.  Totally decomposed.  So— I’m now on mission to fabricate replacements before I can run the unit.  I think I’m going to learn about “Sugru” (which I just received today) to see if I can hand mold some replacements,

https://sugru.com/

There are also multiple puffed up electrolytic caps that need to be replaced in the power supply, which is no surprise, but it does mean it needs a bunch of work before putting the juice to it.

It’ll be a couple weeks but the upside is that it’s all apart now so taking pictures will be easy :-)

Chris
--
Chris Elmquist

> On Nov 27, 2017, at 5:59 PM, Richard <legalize at xmission.com> wrote:
> 
> In article <20171123004632.GC1821 at n0jcf.net>,
>    Chris Elmquist <chrise at pobox.com> writes:
> 
>> [...] I am still
>> missing any detail on how you choose whether you are talking on that
>> DB25 or through the internal modem.   I'm guessing there are a couple
>> pins that get jumpered together when you plug in an external cable but
>> I don't know that yet for sure.  The flip-manual does not discuss
>> selecting modem vs external interface.
> 
> Usually there is a switch somewhere, although I supposed it is
> possible that it uses some signalling from the RS-232 port to
> determine when it is talking to a valid connection.  For instance, for
> a panasonic KX-D4930V the switches are shown here:
> <http://terminals-wiki.org/wiki/index.php/File:Panasonic_KX-D4930V_382290079556-4.jpg>
> 
> Some other manuals from the period indicate that there may be a
> configuration stored within the terminal that configures the interface
> for either modem or the external port.  Check bitsavers for
> documentation on the 763 and 765 terminals and see how they compare to
> yours.
> <http://bitsavers.trailing-edge.com/pdf/ti/terminal/silent_700/>
> 
> If you can take pictures of your unit, the wiki would appreciate it :).
> -- 
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