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Signal LED not lit Make sure the signal source is operating and try another cable. Check position of Volume Pots. Signal LEDs responding to signal level Check the speaker wiring for breaks. Try another speaker and cable. Protect LED is lit Overheating will cause protective muting. Check for proper ventilation. Check the mode indicators on the back panel and make sure the mode selector on the rear panel is in the stereo position. Make sure other equipment in the signal path such as mixers and pre