My Alpine CHM-S620 CD changer broke down and so I

http://vault.alpine-usa.com/products/documents/OM_CHM-S620.PDF

ALPINE BUS 18 FT CD CAR STEREO CHANGER PLAYER EXTENSION CABLE CORD AL88...

yes buy a new remote a universal duh

You can find the manual here: http://www.alpine-electronics.ru/fileadmin/user_upload/manuals/history_products/CHM-S620/OM_CHM-S620_MB.pdf

Go to a magazine store at your local mall. or a book store.

sounds like the changer was plugged into the antenna jack of the radio. this means that you can run it through any radio simply by sending a signal to a preset station on the radio and listening to it through tuner. the control unit ran the changer itself. you may be able to obtain replacement cables from pacparts.com

Well your changer has seen better days, but not dead yet. It can be repaired, but it's gonna cost ya. There are pro's, and con's in the debate between repairing, and buying new, but that's for you to decide.

Alpine makes some of the best, and longest lasting product's in the car audio industry, so getting it repaired isn't a bad idea, but the cost of changers has come down ALOT in the last 6 years so it may not be any cheaper to get it fixed. If you like the Alpine brand, then fix the one ya have, because Alpine no longer manufactures CD changers.

http://books.jvcservice.com/

have you tried a different magazine.  Could this one be warped?

Usually an Alpine unit.  Try ebay.

I've got the same problem with my Alpine changer. It seems like a widespread problem, but known cause or solutions.