Welcome, Philippe 🙂

The service manual simply shows to pry the end plate (not the top) off with a flat screwdriver at the top corner, next to the cassette buttons. Apparently it snaps on somehow. Then you should find two screws at the side of the machine along the top edge.

I've never seen one of these personally, so pay attention to where you insert the screwdriver 😁 (or wait a bit until somebody else tells you more)

Hello Mika, thanks for the tip, it works!

It's always a great moment when you find the sealed enveloppe with the schematics inside😳...

The other surprise is that the cassette deck runs at the right speed nearly forty years after, and that the belt has not melted around in comparison of more recent products...I've had a big cleaning job recently on a Beocord 8000😭

Beocenter 1400 was my first B&O I had! Still have it but it's in storage (can't try removing the sides).

I seem to remember that the side panels just pull off. I think I did it by hand and from the bottom side (rather than from the top).

Dust removed inside, white painting stains removed from the wood😭,

I think it will visually match with 2 Beovox 1000...I'll send pics of the beast in a little while...

Thanks for your precious advice

Philippe