Sony SL-3000 schematic

[Alfonsol]

Hello,

I have a Sony SL-3000 betamax i want to repair.When i plug in the power supply and without any key pressed the drum starts rotating very fast and it doesn't tajke a cassette.

It was working fine before i put it on storage in 2008.
the heads are almost new( changed in 1988 and almost unused since then). My father is the frst owner.

¿Anyone have the service manualor the schematic?