Restoring another T1000

[Pb1x]

I recently bought a T1000 being sold as "broken" on the local auction site.

It was marked as "Regie T& T"

After inspecting it it seems to not have any big problems in the mechanics or core electronics: local mode works,
as does the tape punch and reader.

There was a lot of white crystalline fluff on all black hard plastic parts. It seemed to dissolve in water, so this was
not a big problem, I hope it's not toxic or anything

The main electronics board (GE) seems to be a variant of the GE2 board I saw in the service schematics, however, the
big capacitors seem to be elkos not tantalums.

Here's a photo of the GE board.



(I did replace some of the old elko's with new ones as the telex would seem to "reset" as soon as it tried to print a character,
I measured 2vpp spikes on the 12V line when that happened)

However, I have not had any luck getting the line interface working. It seems to be a variant that only uses one pair,
besides this I don't know much yet.

[Pb1x]

Here's an image of the line modules (STT, etc):


and one of the weird crystals:


If anyone knows what kind of line this interfaced to, and what the weird crystals/powder might be, please let me know.

(The crystals are not battery/capacitor acid as they appear only on black plastic and all the PCBs seem fine.)

[M1ECY]

Hi, it looks to be in quite good condition from the pictures you have uploaded - please, upload many more - Good quality as found pictures are always helpful for machines that have had less careful repairs in the past

Cheers
Sean

[wjack]

Hello Theodore,

I try to give you the answer to the STT/LAT, look like the same PCB that I have in my T1000Z.
It is the interface for a connect to the "Linenstrom" of a current loop source driven rtty-demodulator e.g. the NZ47 (R&S) or FSE401(Siemens).
Some radio-amateure rtty decoder have this current loop source, too.
The LAT can driven 2-wire, single-current or 4-wire, with 60V - 40mA.
Connector on your T1000 for this is the same ADo8 (8 pin) that the FS use in the FS-PBX, but the pinout need a minor modification for the current-loop of the LAT.

Take a look on the WEB-Side of DF3OE - he is also in this forum..
http://www.teleprinter.net/txp/english/technik.shtml

I hope this litte info is helpful to start in the deep of current-loop.

vy73
Werner
dd7xp

[wjack]

Another nice page from TUM - Linienstrom..
https://www.ei.tum.de/lkn/museum/fernsc ... bindungen/

[DF3OE]

Another nice page from TUM - Linienstrom..
https://www.ei.tum.de/lkn/museum/fernsc ... bindungen/

Aber auch dort ist man nicht in der Lage das Papier korrekt zu führen...
Das Papier gehört VOR das Abreißlineal. VOR VOR VOR

Sorry, musste ich mal loswerden....

[wjack]

what an inappropriate comment
Unfortunately, there is no connection to the subject discussed here.

Was für eine Anmerkung..
Der Zusammenhang zu dem hier behandelten Thema fehlt mir da leider..

Weitere Einlassungen können gerne in einem eigenen Topic "Betrieb eines Fernschreiber ohne Gehäuse und seine Unwegsamkeiten" diskutiert werden.

Your "Sorry.." can be accepted..
NNNN

[wjack]

Hey Pb1x
Whats new with your current-loop connecting on the LAT?
Does you need further step?
vy73
Werner
dd7xp