Hello, I own a Yamaha DSP1000 and when I turned ON the power, it won't turned ON but there's a light momentarily and suddenly shut OFF with a clicking sound on the Front Switch. I know it's like the micro switch breaker if it senses overloading or short circuits as protection.
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Disconnect the speakers one at a time and find the bad speaker / speaker cable. OR the amp has blown a transistor. Take it to the service center.