K83 module tester

03/22/2007 K83 module tester
Since I have now built a pile of k83 modules (actually Viessmann 5211) I need to test them and each one has 12 outputs to be tested, I decided that a small plug-in module was in order. The module tests three plugs at a time, allowing all four output pairs to be tested in turn. I took a piece of plywood, screwed three Märklin plugs into it and connected them up to two LEDs and a 1.5K Ohm resistor.

This allows me to insert the tester into a k83 and when the ports are activated the red and green LEDs flash accordingly providing a clear indication that the module and address selection etc. is working!