Onkyo DX-7711 cracks sound when buttons pressed.

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I got a Onkyo DX-7711 Cd player from Yahoo bids for US$120.
Somehow, the variable RCA outputs have cracks when stop, next, previous buttions / remote buttons are pressed.
I read from Forums saying the same do happens. I want to ask if I shield some IC's with 3M copper sheild tapes, would it help?
 
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