10TroubleshootingRefer to the chart below if the unit does not function properly. If the problem you are experiencing is notlisted, or if the instructions fail to help you resolve the problem, disconnect the power cord and contact yourauthorized Yamaha dealer or service center.For the Subwoofer (SW-P240) onlyProblem Cause What to DoNo sound. Speaker cables are not connectedsecurely.Connect the speaker cables securely.Sound level is too low. Speaker cables are not connectedcorrectly.Connect the speaker cables correctly:L (left) to L, R (right) to R, “+” to “+”and “–” to “–”.Problem Cause What to DoPower is not supplied even though thePOWER switch is set to the ON position.The power plug is not securelyconnected.Turn the power switch OFF, thenconnect the power plug securely.No sound. The VOLUME control is set to 0. Turn the VOLUME control to theright (clockwise).Speaker cables are not connectedsecurely.Connect the speaker cables securely.Sound level is too low. Speaker cables are not connectedcorrectly.Connect the speaker cables correctly:L (left) to L, R (right) to R, “+” to “+”and “–” to “–”.You are playing a sound source thatincludes inadequate bass frequencies.Play a sound source that includesmore bass frequencies.The sound level has been diminishedby standing waves.Reposition the subwoofer, or breakup the parallel wall surface byplacing bookshelves or other largeobjects along the wall.