OK SO I WANTED TO INSTALL A 6 DISC FIBER OPTIC CD CHANGER IN MY 2000 C280. The first time i got it and it was damged during the shipping. now that i got this new one it does the same as the old one "NO CD CHANGER" but it fires up and the magazine pps out.IT DOESNT READ THE CD. IT KEEPS SAYING "NO CD CHNAGER" SO I CALLED THE PEOPLE AT THE AUDIO STORE that installed it,AND THEY SAID THAT IT MIGHT BE A BAD FIBER OPTIC CABLE. THEY ALSO SAID THAT YOU CAN TELL IF IT IS A BAD FIBER OPTIC CABLE BUY SHINING A FLASHLIGHT DOWN INTO THE WIRES? MY QUESTION IS NOW HOW DO I DO THAT MEANING DO I TAKE THE END OF THE FIBER OPTIC CORD OFF? AND HOW WILL I KNOW IF IT IS BAD?

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