Troubleshooting - Yamaha A-670 Mode D'emploi

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.
Problem
This unit fails to turn on.
This unit turns off suddenly and the power
indicator turns off.
No sound.
The unit cannot be turned off.

TROUBLESHOOTING

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