Thanks Michael for your great answer. I will special check the solonoid. I have opened the machine and found all particels of ink around the transfix roller, it all looked like coloured grass. I have cleaned everything and done all home positions and tryed again but the same result. Now I have checked on a working 8400 If you make the maintenance cover open, you can see everything in working order with startup and cleaning, and on the good working 8400 you see the drum moving when the maintenance roler goes up and down...So it is realy faulty that mine machine does not move the drum at all when the maintenance roller goes up in the start seqeuences. All the things that you did write have nothing with electronics to do, there must be a signal missing or a fault in the electronics box.
Strange that there is no fault displayed or recognised by the machine. I believe from the point the machine is ready to use the drum works correctly, only in the startup everything goes wrong. Have you ever seen this???
I have made some photograps to display what is happening but can not see a way to attach them to this message.
If have also some other photographs made about opened printing heads etc.
OK, so far now...If someone knows what is realy happening here with my machine...I should be very happy!