Philips Magnavox

Philips Magnavox Stereo Help?
Hi,
I have a Philips Magnavox FW7758/37 Mini HI-FI stereo system. It plays CDs, Tapes, Radio, and has an AUX feature. All of the sudden, it stopped playing CDs. I load a disc into the 3 disc changer, press the disc number, and it says NO DISC. I tried all three of the disc places. None work. How can I fix it or get a spare part?
Thanks
I messed up the model is
FW7758
the problem is with te laser lecture head, it may be disaligned, but in most cases, you must change the head, IF YOU ARE AN ELECTRONICS TECHNICIAN do it, but i think you are not, you musr dissasemble the head and take to an electronics pert suply store. But for shure,take your srereo to a technician.its cheaper than tryng to do it yourselve and at the litless mistake,cause more damage. anyway, it’s a easy repair for who knows haw to doit,and not to expensive.
Vintage Philips Magnavox CD-100 Compact Disc Player – 1980’s