Hi gert,

I used the wiring diagram from the service manual. Eventually i replaced all elco's from the control circuit board and one cracked resistor. To my surprise the circuit board worked then i found out that the power board was damaged also. All the power transistors were removed and compared. One proofed to be damaged, this one was replace by a equivalent transistor bought at Conrad electronics. This solved the problem.

Send your email address and i will forward the drawings and pictures. By the way if you look carefully at your circuit board you may find components that have changed colour. These parts have been hot for a longer period of time, replace them and you may get lucky. I may take you several hours in the sun before you spot these parts.
Regards,
Gerrit