Yamaha A-670 A-670/A-U670 Owner s Manual - Page 15

TROUBLESHOOTING Problem Only the speaker on one side can be heard. There is a lack of bass and no ambience. A "humming" sound can be heard. The sound level is low. (A-U670 only) The BASS, TREBLE, and BALANCE controls does not work. (A-U670 only) The connected PC does not recognize this unit. (A-U670 only) Noisy playback. (A-U670 only) The sound is interrupted. (A-U670 only) Music files cannot be played. Cause Incorrect cable connections. Incorrect setting for the BALANCE control. (When a subwoofer is connected.) The subwoofer is not properly connected. The + and - wires are connected in reverse at the amplifier or the speakers. Incorrect setting for the BASS control. Incorrect cable connections. The volume of the unit is set to a low level. (A-U670 only) The volume of the PC connected with the unit via USB is set to a low level. The PURE DIRECT function is turned on. The operating system of the PC is not supported. Improper USB cable connection. The output of the PC or application is muted. Another application is launched on the PC while a music file is being played. (If another application is launched while a music file is being played, sound may be momentarily lost or noise may be generated.) Another application is launched on the PC while a music file is being played. (If another application is launched while a music file is being played, sound may be momentarily lost or noise may be generated.) The music data are not properly reproduced, because this unit is connected to the PC or the input of this unit is switched to USB while the music application is running on the PC. The dedicated "Yamaha HiFi USB Driver" has not been installed correctly. The audio output destination of the computer is not set to "Yamaha A-U670/A-U671." Solution Connect the cables properly. If the problem persists, the cables may be defective. Set the BALANCE control to the appropriate position. Connect the cables properly. If the problem persists, the setting for the subwoofer may be incorrect. Connect the speaker wires to the correct + and - phase. Set the BASS control to the appropriate position. Connect the audio plugs firmly. If the problem persists, the cables may be defective. Turn up the volume with the VOLUME control so that you can hear sound. Turn up the volume of the PC. Turn off the PURE DIRECT function. Use a PC with an operation-guaranteed operating system. Connect the USB cable properly. Cancel the sound muting of the PC or application. Do not launch other applications during playback. Do not launch other applications during playback. Connect this unit to the PC and set the input of the unit to USB in advance. Then launch the music application and start playback. Install the "Yamaha HiFi USB Driver" again by following the correct procedure. Set the audio output destination of the computer to "Yamaha A-U670/AU671." See page 5 3 6 6 3 5 7 10 8 8 - - - 8 8 9 12 En