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Meridian fan output
This 3.5mm jack provides a voltage and power
suitable for driving a Meridian fan system. The
voltage provided is 12vdc, tip positive. Up to
5W can be taken from this socket. The voltage
is present only when the temperature of the
unitexceeds55degreesCelsiusmeasuredat
the case of the unit.
OPERATING THE C51
Removal of the smoked acrylic front panel
allows access to the Standby button and for
the insertion and/or removal of crossover
cards. Replace the panel after use to avoid
unintentional operation.
Be sure to insert the correct card in the correct
slot.
The unit is normally operated via trigger input.
A front panel standby button is provided to
toggle the unit in and out of standby. It is not
intended that this button should be used for
normal operation.
Note that when mains power is applied to the
unit it will initially enter ACTIVE mode.
When the C51 is in standby mode, power rails
are turned off for a significant saving in energy
usage and thus reduced carbon emissions.
It is neither required nor recommended
to leave the amplifiers in active mode (ie
powered up) when not in use.
When the unit is brought into active mode,
a‘softstart’timingcircuitbringsthemain
toroidal power transformers online gently to
minimise current surges and unwanted startup
sounds.
Indicators
Five pairs (bass/treble) of blue LEDs on
the front panel illuminate when the unit
is operating and confirm the presence of
power on all channels. All ten LEDs should
be illuminated during normal operation: if
a channel light is not illuminated, a fault
condition is indicated.
AfurtherblueLEDissituatednexttothe
Standby button and illuminates when the
unit is in standby, indicating that the unit is
powered. When this light is illuminated, the
channelindicatorsshouldbeextinguished.
A blue LED indicates when the unit has been
shut down as a result of overheating. In an
overtemperature situation the entire unit will
enter standby, irrespective of the status of
the trigger input and whether one or several
channels are the direct cause of overheating.
In this condition, normal operation will
continue as soon as the temperature returns
to safe levels, you are advised to be aware of
what may have caused the overheating issue.
TROUBLESHOOTING
Unit goes silent when played hard
The unit has a temperature sensing system
on board, which prevents overheating of the
electronics. If the unit shuts down because of
overheating, the front-panel “hot” LED will
illuminate.
Sound will continue when the unit has cooled.
However, you are strongly advised to be aware
of what may have caused the overheating
issue before continuing. Is the rack properly
ventilated and cooled? Does the associated fan
come on when the unit becomes hot (if using
the fan output on the unit)? Is sound coming
out of all the speakers?
It is possible that the unit will shut down if
driven for abnormally long periods at unusually
high levels. If this is the case, simply wait
until the unit has cooled down and normal
operation will resume automatically.
There is radio interference
The unit has been designed to very high
standards of electromagnetic compatibility.
If this equipment does cause or suffer from
interference to/from radio or television
reception then the following measures should
be tried: