Switching On; Level Controls; Temperature Control; Fault Indicators - MC2 Audio T2000 Operating Instructions Manual

SWITCHING ON

At 'switch-on' the protection circuit will initially activate whilst the circuits stabilise. Assuming no faults are detected
after a few seconds only the 'POWER' LED (and 'SIGNAL' indicators if signal is applied) will illuminate.
PANEL CONTROLS AND INDICATORS

Level controls

These are analogue controls allowing precise level settings. Note that in 'BRIDGED' mode only 'channel A' control is
active.
Signal Indicators (blue LED)
These are active from a minimum output level of approximately 10 Watts and are an indication only of signal
presence.
Limiters (amber LED)
The T Series amplifiers incorporate signal limiters, which are preset to prevent clipping with high levels of drive.
The amber LEDs on the front panel illuminate to indicate operation of the limiters.

Temperature Control

The cooling fans respond to temperature sensors within the unit to maintain a safe operating temperature. In the event
of excessive temperature, the protection circuit will operate, disabling the output. The red Audio-Protect (A/P) LED
will indicate this condition (see fault indicator).
Normal dynamic signals will not cause the amplifier to overheat unless the ventilation is inadequate. (See
installation section and maintenance section.)
Fault Indicator (Audio Protection – red LED)
If the outputs are shorted or if DC is present, the protection circuit will disengage the outputs and the A/P LED will
illuminate. The amplifier will continue to be monitored and depending on the type of fault, will either reset after the
fault has cleared or require manual resetting by switching off at the mains switch and then on again after a few
seconds. (See also temperature control above )
Temperature related faults will reset if the unit has cooled sufficiently.
Output short circuits will require manual reset after clearing the fault.
Bridged LED (green)
This indicates the position of the switch on the rear panel and is illuminated when bridged mode is selected with the
switch pressed in.

100V LINE OPERATION

When using the T Series with 'line' transformers, it is recommended that the frequency response is altered to prevent
saturation of the transformer core with large signals. This could trigger a fault condition since it would be seen by the
amplifier protection circuit as a short circuit on the output.
The T3500 and T2000 should be fitted with a suitable cross-over card set to roll off the LF response to be -3dB @
63Hz.
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