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Troubleshooting
Symptom
The display automatically turns off if the PX
amplifier has not been operated for a while.
[PROTECT] indicator lights and an "OUTPUT
CURRENT OVER" message appears on the dis-
play.
[PROTECT] indicator lights and "AMP TEMP
TOO HIGH" message appears on the display.
[CLIP/LIMIT] indicator lights.
Power does not turn on.
Power suddenly turned off, and immediately
turned off even when turning on again.
Sound from speakers is distorted.
The sound is muffled. No high-frequency sound.
When "ROUTING" is set to something other than
"DUAL," the level of channel B is low.
Possible causes
For the protection of the display, the display automatically turns off if the
PX amplifier has not been operated for 20 minutes.
If the Black-out mode is on, the back light of the display automatically
turns off when PX amplifier has not been operated for around 10 sec-
onds.
There is a short at the speaker terminal, amplifier terminal or wire, and
circuit protection has been engaged.
Since the impedance of the connected speaker is excessively low and
the amplifier is overloaded, circuit protection has been engaged.
Because the internal temperature is excessively high, thermal protection
has been engaged to protect the circuit.
Because the input signal is excessive or the output exceeds the rated
voltage, the signal is clipped or the limiter has been engaged to protect
the circuit.
The power supply connected outlet is significantly different from the
rated range.
Because the internal temperature is excessively high, thermal protection
has been engaged to protect the circuit.
The output level is excessively high.
The device is broken.
The input level exceeds the setting of the input sensitivity.
The sound is filtered. The filter status can be checked in the HOME
screen.
The volume knob of channel B, with which the output balance to channel
A is adjusted, has been lowered.
Possible solution
Press any key on the front panel or rotate the main knob to turn on the display
again.
Press any key on the front panel to turn on the back light of the display. If the
Black-out mode is set to off, the back light does not turn off even if the PX
amplifier is not operated.
Turn the power off and check for a short in the speaker terminal or amplifier,
wire, etc., and turn it on again.
Check that the speaker has not been damaged and that total impedance is not
excessively low, and review the speaker connection.
Check the amplifier ventilation conditions and take appropriate measures to
improve the airflow around the amplifier. Leave the amplifier off until the internal
temperature goes down, and then turn it on again.
Lower the output level of the device connected to the input connector, or lower
the volume of the amplifier.
Check the source voltage.
Check the amplifier ventilation conditions and take appropriate measures to
improve the airflow around the amplifier. Leave the amplifier off until the internal
temperature goes down, and then turn it on again.
Lower the output level.
After disconnecting the speakers, turn on the device without inputting any sig-
nal, or lower the volume completely, turn on the device. If the symptoms do not
improve, the device is broken. Contact your Yamaha dealer.
Adjust the input sensitivity to match the input level with the CONFIG WIZARD
screen.
Change the setting of the filters in the MENU screen (TUNING screen).
Raise the volume knob of channel B.
Reference — Troubleshooting
42
PX10/PX8/PX5/PX3 Reference Manual
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