Yamaha PX10 Reference Manual page 43

Symptom
No sound from speakers.
The panel controls cannot be operated.
The parameter settings need to be returned to
their initial values.
An indicator does not light in a condition in which
it normally should light. The display is blank.
The display is dark.
After starting up again, parameters you've edited
have returned to the values before editing.
Reading or writing from/to a USB flash drive
takes a long time.
* If any specific problem should persist, contact your Yamaha dealer.
Possible causes
Cables are not connected appropriately. If the meter does not rise even if
raising the volume knob, there may be problems in connectivity at the
input side. If the meter rises, there may problems at the output side.
The outputs of the mixer connected to the input jacks are lowered. There
is a possibility that the meter does not rise even if the volume knob is
raised.
Level has been lowered with the volume knob.
The mute is on. When the mute is on, "MUTE" appears in the HOME
screen.
The protection circuit has been engaged and the output is muted. When
the protection circuit is engaged, the [PROTECTION] indicator lights.
The speaker type is Power Boost mode (PX5 and PX3 only).
The panel lock is turned on.
—
The Black-out mode is on.
The "BRIGHTNESS" in PANEL SETUP screen is set to low value.
The device was shut down before the current parameters were stored
automatically.
The USB flash drive contains a number of files. The more files that are
contained, the longer time is required.
Possible solution
Connect to input jacks and output terminals appropriately. At the output side,
make sure that terminals outputting signals are connected. Refer to
examples" (page 4) for connection instructions.
Raise the output of the mixer.
Adjust the volume knob accordingly.
Turn off the mute.
Identify what is causing the protection circuit to engage and solve it.
In Power Boost mode, audio signals are not output from channel B. Cancel
Power Boost mode or reconnect the cables.
Turn off the panel lock. Refer to "Panel lock"(page 14)
ing off the panel lock.
Return the settings to the initial values. To do this, refer to
amplifier" (page 35).
To temporarily make the indicators light and the display work, operate the
panel. To make the indicators light and the display work regularly, turn off the
Black-out mode. Refer to "PANEL SETUP" (page 32)
Set the "BRIGHTNESS" to a higher value.
When the device is shut down, wait more than 3 seconds after editing current
parameters.
Delete files the PX amplifier does not need.
Reference — Troubleshooting
"Usage
for instructions on turn-
"Initializing the PX
in UTILITY screen.
43
PX10/PX8/PX5/PX3 Reference Manual