well , there are no adjustment to be made . what you could try to do before replacing the cd changer is to try replacing the cd cassette . if that doesn't do it contact your dealer and see what they charge to have the cd changer sent out for repairs or have it exchanged ( check with the parts department , if you talk to service they will want to charge you to take it out , you can do that yourself ) .
thanks and let me know what you find out .
BMW Technician
12 YEAR MASTER TECH