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Hallo Balasz,

angeschlossenen wird der Tschechische T100 an dem Walzenstecker an den
Punkten a und c zur TW39 Karte. Die Punkte b und w2 werden in der
Anschlußdose gebrückt und dienen zur lokalen Spannungsversorgung
des Fernschaltgerätes.
Du hast an den Punkten a und c 0Volt gemessen. Das sieht nach einem
Kurzschluss aus. Mess einmal den ohmschen Widerstand am T100 zwischen
a und c, der sollte bei ca. 21000 Ohm sein.
Dieser Kurzschluss kommt wenn der Papierkontakt geschaltet hat,
das passiert wenn kein Papier vorhanden ist oder aber die Haube
abgenommen wurde. Dazu muss die Stange die den Papierkontakt
auslöst nach oben gedrückt werden. Das habe ich schon bei 2 tschechischen
T100 gehabt ist eine Besonderheit, nur beim Brno. Beim original Siemens
T100 gab es nur in den wenigsten Fällen eine Papierkontakt und da wurde
es anders gelöst. Siehe #14.

Das ist erst einmal meine Idee, schreib einmal was für einen Widerstand
Du gemessen hast.

Hello Andreas!

Thanks for the good tip!
Originally I measured 750 Ohm between a--c
After engaging the paper switch, I jumped to 22 kOhm
For reference, I paste an image here how it should be done, maybe useful for somebody else too: After this change the following is different:

• The led red is constantly blinking on the TW39 card

• The online lamp is not lit after power up

• No matter the T100 is powered or not, the relay SZ is engaged

• I made a video on the non-deterministic behavior of the relays after pressing online-offline buttons multiple times. See it here:

• If I change the polarity of the TW39 wires, the machine starts and cannot be switched taken offline. So I assume polarity is fine

Hello Balazs,

levend hat geschrieben: ↑So 18. Sep 2022, 10:37

• The led red is constantly blinking on the TW39 card

That indicates that your TW39 is not configured properly or you have two cards using the same internal extension number.
To configure the card you need to press the button on the card and run the configuration on the teleprinter.
I have no clue, how to run the configuration without a teleprinter. If you have a double TW39 card, you can try remove the processor of the unused port.

levend hat geschrieben: ↑So 18. Sep 2022, 10:37

• The online lamp is not lit after power up

That is great, that means you have line current. Your teleprinter is connected correctly to the interface card.

Thank you for sharing the video. I watched it several times in slomo. Comparing it with the description of Andreas in post #18 I see, your relay "W" does not close except for a short period at the end of the video. Please check your components in your FSG, especially around relay "W". Intermittent contacts are sometimes hard to find.

Hello Wolfgang!
I was not aware that the card needs configuration too - i can connect it to my other teleprinter, and run the configuration there. However it seems to be in German - do you know if there is a way to switch over to English configuration menu?

The set-up menues for the boards are ONLY in German. But it is very basic and should be
easy to understand even when you have no German skills.

I have an Finnish T1000S, language is same as Hungarian for a German. I can tell you, that's a challenge.

What is even more interesting ----
On TW39 interface #1: the configuration menu is displayed normally on the teleprinter(the working one, T1000S), but in german. I left everything unchanged

After I connect the T1000s teleprinter to TW39 interface #2, and long press the button on it: the teleprinter starts, the blue led is blinking on the interface card, but nothing was print out on the teleprinter.

DF3OE hat geschrieben: ↑So 18. Sep 2022, 12:39 The set-up menues for the boards are ONLY in German. But it is very basic and should be
easy to understand even when you have no German skills.

I have an Finnish T1000S, language is same as Hungarian for a German. I can tell you, that's a challenge.

Sure, with the help of google translate everything is fine
Finnish T1000S, wow thats something

Hello Balazs,

I'm a bit confused now because I thought the T1000S - the one with the screen, right? - is an electronic teleprinter and uses already an ED1000 interface.
The T100 usually uses the TW39 interface. Both interfaces are not interchangeable.
Maybe you can explain your hardware configuration of your i-telex, I don't want to give you wrong advice.

I can check the setup menue of the interface card and provide you a translation here. Give me a moment.

Basically all electronic machines could be fitted with any line interface depending on the particular Telex network
it was connected to.
Of course German machines were equipped mit ED1000 line interface, but e.g. Austrian and Finnish had a V.21 interfaces
and others (like Netherlands) had TW39 current loop interfaces. All was available.
I would guess that Hungary kept the old TW39 system until the end of Telex.

Hi Wolfgang!

Many thanks for the translation!
Regarding my T1000S: this is a "strange" machine - it has TW39 interface card installed in it. I think because the majority of the Hungarian telex network used the old current loop technology.

And what is even better, there is a solution why the machine was not receiving anything, but was able to send from it: I misplaced one of the optocouplers on the TW39 board - see the picture for reference again a stupid user error on my side. At least an easy fix. So to conclude, the machine is working, the TW39 card is working, I can create local connections between the two machines, calling working from every direction. I can even do an outgoing connection

Many thanks for all of you for your help!

ps.: It's time to find a third machine