Introduction
Problem: CD playing problems as cracking, fas-forwarding, lack of bass...
Problem can be solved by cleaning the laser lense.
Tools
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Remove the data cable from the amplifier by pulling during pressing the plug on both sides
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Remove the 4 crews on the sides and the 3 screws on the back to remove the cover
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The laser is located under the laser protection shield
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You can move it closer by turning the white gear to get better access to clean it
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Take a microfiber cloth or any clean cloth which is lint-free
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Wrap it around a flat screwdriver and soak it with high-percentage cleaning alcohol. I used 80% alcohol and it worked fine
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Clean gently and carefully the lense
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Turn the laser back to its standard position with the gearwheel
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To reassemble your device, follow these instructions in reverse order.