Hello I have figured out that i have the following connections (red arrows):
![](http://storage6.static.itmages.com/i/17/0306/h_1488826403_3358607_4261f85e24.jpeg)
Also i have connections between diodes: D10, D09, D08 and D07 also in the next colum D05, D04, D03 and D02
So i think from this path it looks good, also the diaode test between this path are working only in one direction.
So I need to figure out the other path from the 3 switches. Did someone know where i have to test?
rgds Eisi