Controls And Functions; Front Panel - Yamaha XMV4280 Owner's Manual

Controls and Functions

Front Panel

q
q Power Switch
Turns power to the unit ON or OFF. Setting the switch to the
upward position turns the power on; the [POWER] indicator
will light green. Setting the switch to the downward position
turns the power off. If the switch is in the upward position
and the [POWER] indicator is blinking, the unit is in standby
mode.
CAUTION
• To ensure that high-volume noise is not output from
the speakers, power-on the equipment starting with
the audio sources, then the mixer and processors
(such as the MTX), and finally the amplifiers. Reverse
this order when turning the system off.
• Rapidly turning the power switch ON and OFF in suc-
cession can cause the unit to malfunction. After turn-
ing the power switch OFF, wait for about 5 seconds
before turning it ON again.
• If you modified parameter settings, do not turn the
power switch OFF for at least one second. Otherwise,
the changes to the settings may be lost.
w [PROTECTION] indicators A/B/C/D
When the protection system is active, the indicator will light
orange. If the audio output is muted, turn off the power and
wait for the XMV to cool before turning the power on again.
The protection circuit will operate in the following situa-
tions.

If the amplifier overheats and the output lim-
iter operates
The speaker output will be attenuated if the heat sink of
the amplifier section exceeds 80°C (80%), and will be
muted if the heat sink exceeds 90°C (90%). The [PRO-
TECTION] indicator will light at 80°C (80%) or higher.

If the power supply overheats and shuts-down
The fan will rotate at high speed if the power supply sec-
tion exceeds 90°C, and the analog circuits will shut down
if it exceeds 100°C.
The [PROTECTION] indicator will light at 100°C or
higher.
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XMV4280/XMV4140 Owner's Manual
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
When overcurrent is detected
If for any reason the impedance falls below rated, the
speaker output is muted to prevent overcurrent; muting
will be cancelled after approximately one second. If over-
current is detected after muting is cancelled, the output
will be muted again.

If DC output is detected
The power supply section will be shut down.

If excessive total current or maximum current
is detected
The output signal will be compressed.
e [LIMIT] indicators A/B/C/D
When the limiter operates, the speaker output will be limited
and the indicator will light red. Lower the attenuator value so
that the limiter does not operate. The limiter will operate in
the following situations.
• When an instantaneous input overload is detected
• When an input overload has been occurring for a specific
duration
• When the heat sink of the amplifier section exceeds the
allowable temperature
r [SIGNAL] indicators A/B/C/D
The indicator will light when the input from the analog input
connector / [YDIF] connector or the output from the
[SPEAKERS] connector rises above a certain level.
If the [SIGNAL] indicator is set to show the input from the
analog input controller / [YDIF] connector, it will light when
the signal level is greater than -40 dBFS.
If it is set to show the output from the [SPEAKERS] connec-
tor, the indicator will light when the indicator on the
XMV4280 will light when the signal level exceeds 1 Vrms
in 280W/8Ω mode. Refer to "[SIGNAL] Indicator Lit Level"
in the Specifications for the indicator illumination conditions
in each mode.
For details on switching the indicator between input and out-
put, refer to "List of Front Panel Operations" (page 20).
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