Hi,
I am having that Power Supply problem:
I had this PSU on my Komplete Kontrol S88 keyboard not starting up on the first time I switched it on, then it started deteriorating until I couldn't start it up even after many tries at a time; it just wouldn't start up!
The keyboard has been void a long time ago so I have no problem voiding the warranty by opening it up. I just need the Hardware Service Manual (not the user guide of course), or the Schematic Diagram with test points.
Any help is highly appreciated.