It is the one on the heatsink, so you have the right one! .3 volt is much too low, it should be around 23 volt. Check F3 on the PCB behind the transformer, otherwise the problem is almost certainly in PCB62 (regulator PCB behind the CD-player). It could be the relay on this PCB.

ok re-checked the fuse on the heathsink..  when idle = .3V when active = 28v.  I also swapped out PCB 62 from the 9500 with the one from the 9000 and still no movement on the 9500, yet the board works just fine in the 9000.   Also the board from the 9500 works just fine (doors open etc) in the 9000.

so I am still scratching my head on this one. 

I just got a Beocenter 9500 today with the same trouble with both doors will not open.

I brought it to Dillen so if he does not post here I will do so when has had a look on it.

Are the motors on the BeoCenter OK? 

Board 45 (upper middle display board), have you checked that there is a 15V supply across supply pins 2 and 4 of IC 2 or 3?

Motors are fine... that was the first thing I checked.

DVDude wrote:

Motors are fine... that was the first thing I checked.

DVdude did you check board 45 as above? Make sure you measure across the IC pins if you usually ground the negative to take measurements. Make sure machine is on or press load [cd/tape] while measureing too!

Also I think the manual states 14v not 15 sorry.

I will check board 45 when the guests I have over leave...   my project space has been re-tasked

Did you ever get round to checking board 45?