Soemtron ETR 224 Downloads

224 Downloads

Soemtron 224 Downloads

This page has downloadable drawings and information for the Soemtron ETR 224 electronic calculator. Updates and corrections to the drawings are uploaded on an ad-hoc basis as they come to hand, but we do not accept responsibility for their subsequent use. The files will usually be in pdf format so a current copy of an Adobe Acrobat reader will be needed which you can download here. To download the files right click the relevant link and select "file save as ....", to view the file directly just click the link, assuming you have a pdf viewer installed !. All files on this website are ©2007- www.soemtron.org, group websites or the files respective owners.

If you know of, or have any more history or information about the Soemtron brand, the 220 222 224 or the very rare 221 machine, test equipment (Prüfgeräte) or you just know more about the Soemtron companies in general then please let us know, contact us here.

Soemtron 224 Circuit and Logic diagrams -
(See the "Snagging list" file for the current list of things to check with our ETR 224)

Power supply and mains wiring	circuit	updated	19/May/2011
Printer mechanical assembly wiring	circuit	updated	19/May/2011
Digit position photo-amplifier circuit	circuit logic	updated pending	29/Jan/2010
Solenoid driver boards and mounting bracket wiring circuit	circuit logic	updated pending	19/May/2011
Unknown board function wiring	circuit logic	updated pending	19/May/2011
Keyboard circuit and encoding	circuit logic	updated pending	23/June/2011

1	V.E.B.	Volks Eigener Betrieb, or Peoples Owned Company
2	Büromaschinenwerk	Office Machine Works
3	Group websites	www.soemtron.org www.soemtron.com www.pdp-7.org www.pdp-7a.org	back

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