Soemtron ETR224 Downloads

Soemtron logo of unknown origin

This page has downloadable drawings and information for the Soemtron ETR224 electronic calculator derived from our own unit S#32612.  Updates and corrections to the drawings are produced on an ad-hoc basis as they come to hand, 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 view them.  To download the files right click the relevant link and select "file save as ....".  All files on this website are ©2007– and its group websites[2] or the files respective owner.

Soemtron logo

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.

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

IronCAD 3D design3D CAD -
Multiple 3D CAD models of various Soemtron parts have been created using the latest version of IronCAD 3D and and 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.

Daro 11 pin connectors - models for the Daro 11 pin plug and socket connectors. (1.9Mb)
Daro 20 pin connectors - models for the Daro 20 pin plug and socket connectors. (2.5Mb)
Daro 32 pin connectors - models for the Daro 32 pin plug and socket connectors. (2.8Mb)
Test connector shorting link - V7 test connector shorting link for normal operation. (184Kb)

Soemtron ETR224 Circuit and Logic diagrams –

(See the "Snagging list" file for the current list of things to check with our ETR224)
Printer mechanical assembly wiring circuit
updated 1-10-2014
Under keyboard wiring and circuit circuit updated 1-10-2014
Solenoid driver boards and mounting bracket wiring circuit circuit
updated 10-09-2014
Keyboard circuit and encoding circuit
updated 10-09-2014
Board 1 – Core Store circuit
updated 10-09-2014
Board 2 – Core Driver circuit
updated 28-10-2014
Board 3 – B1, B2, VOR circuit
updated 8-9-2017
Board 5 – Z counter, Drives 1,4,17 circuit
updated 10-09-2014
Board 5 – Clock, R, A, C circuit
updated 4-09-2017
Board 6 – Wheel position count 1-8 circuit
updated 10-09-2014
Board 7 – A register 1-8, C register 1-8 circuit
updated 10-09-2014
Board 8 – E register 1-8 circuit
updated 11-09-2014
Board 9 – Read, Write, V1 circuit
updated 11-09-2014
Board 10 – MZ, misc. gating circuit
updated 11-09-2014
Board 11 – UBER, F2, VER circuit
updated 11-09-2014
Board 12 – F1, F3, F4, F5, misc. gating circuit
updated 11-09-2014
Power supply and mains wiring circuit
updated 10-09-2014
Backplane (Electronics card cage) circuit
updated 10-09-2014

Complete circuit circuit
updated 8-9-2017

1 Download Adobe Acrobat Adobe reader download.[top]
2 Group websites[top]
3 IronCAD Latest IronCAD download.[back] [top]
4 IronCAD Compose IronCAD Compose download.[back] [top]

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