I tried to disassemble my Beocenter 9500 to replace the belt for the cd and tape doors. But after I removed the both black glas pannels and I started to remove a screw to remove the silver pannel in between the tape and the cd it felt like something dropped, like a nut fell an now the screw can't get any "grip" when I try to put it back.

I didn't try to remove the other 3 screws for the pannel as I'm affraid to destroy something here. Could someone tell me how to disassemble the system so that I can replace the belt and find the nut that fell into he system.

Download the service manual from this site. This has dis-assembley instructions and shows you which screws to remove to open the Beocenter rather like a hood of a car - it's a great design. Once opened you can locate the nut that fell into the unit and get to the small rubber bands that were your original mission. Two words of warning - try not to dislocate the door strings and don't replace the glass panels until the hood's closed again incase they drop out.

yes, that did the trick!

forgot to say,

Thank you!