Refer to the chart below if this unit does not function properly. If the problem you are experiencing is not listed below or if the instructions below do not help, turn off this unit,
disconnect the power cable, and then contact the nearest authorized Yamaha dealer or service center.
TROUBLESHOOTING
ProblemCauseSolutionSee page
This unit fails to turn on.The power cable is not connected or the plug is not completely
inserted.
Connect the power cable firmly.
6
The protection circuitry has been activated because of a short
circuit, etc.
Check that the speaker wires are not touching each other and then turn the
power of this unit back on.
6
There is a problem with the internal circuitries of this unit.Disconnect the power cable and contact the nearest authorized Yamaha
dealer or service center.
-
A speaker with a low impedance is connected.Use speaker(s) with proper speaker impedance (6 Ω or higher).
6
This unit turns off suddenly and the power
indicator turns off.
The speaker wires are touching each other or shorting out against
the rear panel.
Connect the speaker cables properly and turn the power on again. Confirm
normal sound output from speakers after the unit is turned on.
6
The speaker is malfunctioning.Replace the speaker set and turn the power on again. Confirm normal
sound output from speakers after the unit is turned on.
-
This unit has been exposed to a strong external electric shock (such
as lightning or strong static electricity).
Turn off this unit, disconnect the power cable, plug it back in after 30
seconds, then use the unit normally.
-
There is a problem with the internal circuitries of this unit.Disconnect the power cable and contact the nearest authorized Yamaha
dealer or service center.
-
No sound.Headphones are connected.
(When headphones are connected, no sound comes from the
speakers or subwoofer.)
Disconnect headphones when you use the speakers or subwoofer.
-
Incorrect cable connections.Connect the stereo cable for audio units and the speaker wires properly. If
the problem persists, the cables may be defective.
5
Playback has been stopped on the connected component.Turn the component on and start playback.
7
(A-U670 only) The driver is not installed in the PC connected with
the unit via USB.
Before connecting a PC to this unit, install the driver on the PC.
8
The volume of the unit is set to the minimum.Turn up the volume with the VOLUME control so that you can hear
sound.
-
The unit cannot be turned off.The internal microprocessor is frozen due to an external electronic
shock (lightning, excessive static electricity, etc.) or decrease in the
power supply voltage.
Press the power button on the front panel of the unit for 10 seconds or
more to restart the unit (If the problem persists, unplug the power cable
and after about 30 seconds, then plug it back in again).
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