Soemtron 222 Downloads, S#74005

S#74005 - Technical Description

This page has downloadable drawings and information for our Soemtron ETR222 electronic calculator serial number 74005.  Updates and corrections to the drawings will be uploaded on an ad-hoc basis as it comes 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[1] reader will be needed.  To download the files right click the relevant link and select "file save as ....".  All files on this website are ©2007- www.soemtron.org and its group websites[2] or the files respective owner.

If you have any further historical information, circuits, drawings, photographs, data or manuals about the Soemtron ETR220, 221, 222 and 224 or their manufacture, test equipment (Prüfgeräte) or you just know more about the Soemtron companies in general then please let us know, contact us.

September 2017 - Reverse engineering our Soemtron 222 has just started and initial results have confirmed that the 222 is in fact derived from the ETR224, not the ETR220 as we thought some while ago.  Several of the main PCB's are labelled "224-" (the "4" is scratched out) and several "22  -", with several being at the same issue level as the corresponding PCB of the ETR224 board.<

Part number list - a list of all Soemtron part numbers currently available to us from various documents (35Kb)

3D CAD -
Multiple 3D CAD models of various Soemtron parts have been created using the latest version of IronCAD 3D and they can be edited with a free 30 day trial[3], or viewed with a copy of IronCAD Compose[4].  The files are supplied in IronCAD native (.ics) and Step (AP214) formats within a zipped file.

Soemtron ETR222 Circuit and Logic diagrams -

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