If the CD spins EXTREMELY fast, like it was part of a jet engine, it's most likely a problem
with the transistors that control the spindle motor.
It has been seen before and, strange enough, it almost always spins in the wrong direction.

Can you provide a photo of the servo board for us to look at ?

Martin

Hey Martin, thank you for your respons, that a good point you say about bad trasistors. I find a old foto her from Beoworld that eksactly the same servo board in my BC8500. It s the latest cd unit ther was use in BC 8500/9500 call CDM 4/57.

Dillen wrote:

If the CD spins EXTREMELY fast, like it was part of a jet engine, it's most likely a problem
with the transistors that control the spindle motor.
It has been seen before and, strange enough, it almost always spins in the wrong direction.

Can you provide a photo of the servo board for us to look at ?

Martin

I don't believe that these symptoms will be cured on the servo board.

I have cured several like this by replacing the CD Interface/Decoder board 31 although I could not find a fault on the boards.

Some of the IC's on this board do seem to run quite warm but cooling spray did not help. Might be bad solders?

TJ thinks it could be a transistor on the underside of the board but was unsualy non forthcoming.

I would be interested in your thoughts on this. 

There are so many different (but quite similar looking) servo boards around.
The board shown in that photo does not have the transistors, I am referring to
and is not the type of board that I have seen make this fault.

Martin