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Alpine CHM-S620 6-Disc CD Changer Questions & Answers
Is there a frequency required
You can find the manual here: http://www.alpine-electronics.ru/fileadmin/user_upload/manuals/history_products/CHM-S620/OM_CHM-S620_MB.pdf
Won't read disks
If the unit is more than a couple of years old the lens on the laser should be cleaned if this doesn't make any difference you will need to replace the laser, if you remove the cover from the unit and observe whether the cd spins when it loads this will tell you that the unit is attempting to read the disc and usually cleaning will solve the problem, be careful when handling the laser as static from you can damage it
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