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13.5. Troubleshooting
Symptom
Display is not shown
The display indication disappears if
the unit is not operated for a time.
Display is dim.
Power does not turn on. Power
suddenly turns off, and immediately
turns off even if you turn the power
on again.
The sound from the speaker is
distorted.
Sound is muffled. High frequencies
are not output.
No sound from the speakers.
Panel operations are not possible.
Possible causes
The DIMMER (DIMMER
BRIGHTNESS) setting is at 0%.
To protect the display, the display
indication disappears 30 minutes
after the PC-D/DI series unit was
last operated.
The PANEL SETUP screen's
"BRIGHTNESS" is set to a low value.
When no operation is performed for
a time, the AUTO DIMMER function
automatically dims the screen.
The power supply voltage of the
connected AC outlet is significantly
outside the allowable range.
The interior of the amp is at a high
temperature, perhaps because an
obstruction or dust is blocking the
ventilation and impairing the
cooling.
The output level is too high.
The input level exceeds the input
sensitivity setting.
A filter is applied. The filter status
can be viewed in the HOME screen's
SP PROCESSOR page.
A cable is not connected correctly.
If the meter does not rise even when
you raise the volume knob, there
could be a problem with the input
connection. If the meter does rise,
there could be a problem with the
output connection.
The output is turned down on the
mixer connected to the input jack.
This is possible if the meter does
not rise even when you raise the
volume knob.
The level is lowered by the volume
knob.
The mute function is on. In the
HOME screen you can check
whether the mute function is on.
The protection circuit has operated
to mute the output. If the protection
circuit has operated, the display
indicates [PROT], and the indicator
of the corresponding channel
flashes red.
Panel lock is enabled.
PC412-D PC412-DI PC406-D PC406-DI Owner's Manual | 83
13. Reference
Possible solution
Set the DIMMER (DIMMER
BRIGHTNESS) setting to 25% or
higher.
To bring back the display, press any
front panel key or turn the knob.
Set "BRIGHTNESS" to a high value.
To bring back the display, press any
front panel key or turn the knob.
Connect a power supply of the
appropriate voltage.
Check the ventilation status, and
take measure to ensure cooling.
Then, after waiting for the unit to
cool down, turn the power on again.
Lower the output level.
Using the AMP SETTINGS screen's
SENS./GAIN setting, adjust the input
sensitivity appropriately for the
input level.
Use X-OVER to change the filter
settings.
Correctly connect the input jacks
and output jacks. For the output
connection, also check that you are
connected to the jack that is
outputting the signal.
Raise the mixer's output.
Adjust the volume knob.
Turn off the mute function.
Check the operation log to
determine the reason that the
protection circuit operated, and
correct the cause.
Defeat the panel lock function. For
the method, refer to "Panel lock."
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