Yamaha YST-SW012 Owner's Manual - Page 10
Troubleshooting - subwoofer instructions
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Troubleshooting Refer to the chart below if the unit does not function properly. If the problem you are experiencing is not listed, or if the instructions fail to help you resolve the problem, disconnect the power cord and contact your authorized Yamaha dealer or service center. Problem Power is not supplied even though the POWER switch is set to the ON position. No sound. Sound level is too low. Cause Remedy The power plug is not securely connected. Turn the power switch OFF, then connect the power plug securely. The VOLUME control is set to 0. Turn the VOLUME control to the right (clockwise). A subwoofer cable is not connected Connect a subwoofer cable securely. securely. You are playing a sound source that Play a sound source that includes includes inadequate bass frequencies. more bass frequencies. The sound level has been diminished by standing waves. Reposition the subwoofer, or break up the parallel wall surface by placing bookshelves or other large objects along the wall. The input signal is too small Turn up the volume. 6