You have never said what happens exept it will not start right?
This means there is power and maybe light but the arm does not move?
If the MMC20S is ok when playing the best thing to do do is to bring it to Dillen in Copenhagen. You have less travel time than me.
A no functional 4002 is not worth much and the MMC20S is not going to give any big value either.
Since you are close to Denmark you might find a MMC20EN/CL on dba.dk which is still good or maybe beoworld. Avoid ebay!
It pays of in the end keeping these Beograms running as the demand for working units will always be there. It can also start the infamous Beovirus which most of the members here can't be cured for. We are lost in that area.