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+[* black] Use a can of compressed air to carefully blow away dust that is attracted to electronic components. If excessive, use a vacuum cleaner with a plastic tip (so delicate parts won't receive static electricity) to clean the inside of the unit.
+[* black] Use electrical contact cleaner to clean the input jacks and speaker terminals. If one of the input jacks is disconnected from the wires, either reconnect or resolder it.
+[* black] If none of these measures solves the problem, seek professional help. Modern audio equipment is built using delicate components that cannot be repaired; instead, they are replaced. Your audio professional will know which ones to replace, where to get them, and how to do the job.

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