Sony STR-AZ3000ES Startup Manual page 402

Multi channel av receiver

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Multi Channel AV Receiver

STR-AZ7000ES/STR-AZ5000ES/STR-AZ3000ES

There is severe humming or noise.

Check that the speakers and device are connected securely.

Make sure that the connecting cables are not near a transformer or motor.

Move your audio device away from the TV.

The plugs and jacks are dirty. Wipe them with a cloth slightly moistened with alcohol.

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