T100s ZFM function

#1

Hello All,

I have a problem with my T100s and the ZFM function (Two Colour Printing for those no knowing the abbreviation)

Mechanically if I hold the control bar to the rear of the machine I can get black printing, but standard, for both incoming and outgoing text is currently red - this is not correct - Incoming text should be black.

The ribbon is of course inserted correctly.

I think the issue is electrical, but as most of us mere mortals are not used to trying to decipher the wiring diagrams of the Telecommunications master of Germany.

Could someone explain how the ZFM system is working electrically within the T100S - it must be a fialry simple circuit, after all it is only switching current to a solenoid coil, but there is so much going on in this machine I quickly get lost searching for the control circuits - I really do not want to completelt strip the machine just to trace wiring

Any help gratefully received.

Thanks
Sean

#2

Problem solved - In the end it was mechanical.

Referring to the screenshot from the service manual, I have highlighted a very small spring.

This was detached - the lever site behind the ZFM solenoid, and acts as a gate to allow the colour change bar to activate - with this spring detached, the solenoid has nothing to act against.

Screenshot 2024-03-18 064039.png

#3

Moin Sean,
Ich habe das gleiche Problem an einm T100 und an einem T100S. Habe wegen dem momentan schönen Wetter erst mal aufgehört weiter zu suchen. Elektrisch ist bei mir alles in Ordnung, deshalb habe ich den Fehler auch auf der mechanischen Seite vermutet. Ich denke ich muß genau an dieser Stelle weitersuchen. Mal schauen, wenn das Wetter wieder schlechter wird....