need help in aiwa cx-nv20u minicompo

[jumpin]

hi, please anybody helpme:
I have aiwa cx-nv20u, tuner is ok, tape ok, the 3 cd plate is no running at the exact place where the cd is read or played, i have to move it a little manualy, in order to get a rigth position
The display detect well the allocations of 3 places.
Note: I yet have made mechanical service.
and the position sensor seems to be ok