when play button is pressed down there is a high pitch sound, when the volume button is turned low it disappears and then when on high it is a high pitching noise.
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This is a common problem that is usually resolved by cleaning an internal multi-bank switch. The problem is a feedback loop that is caused by dirt/debris inside the switch which connects a couple of circuits that should be separated. Open up the unit and spray all switches with a lubricating electronics switch cleaner. Engage the switches multiple times and the problem should be resolved.
Dan
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