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Anonymous Posted on Apr 26, 2014
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NAD c520 disc won't spin - NAD C521 CD Player

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Anonymous

  • 31 Answers
  • Posted on Sep 17, 2008

SOURCE: Nad c520 high pitched ringing

Hi, From your description, it sounds as if the noise is coming from the circuit that controls the display backlight. If I recall correctly, the C520 has an EL backlight just like the C521 (which I have one of). On the front of the circuit board, there should be a little yellow trimmer potentiometer that controls the brightness of the display. It may be that the noise will go away if the brightness is turned down some. If  the noise varies as you turn the controller, but doesn't go away completely, the backlight may need servicing.

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