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8 C45 User Guide Version 1.0

Operation

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 (3 Green LEDs)

These are active from a minimum output level of approximately 10 Watts and are only an indication of

signal level.

-3dB Indicators (yellow LED)

These are active when the signal is 3dB below the limiting level.

Limiters (Red LED)

The C-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.

PRC Indicators (green LED)

These indicate when the PRC circuit for that specific channel has been selected with the rear panel

switches.

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.)

There are 4 fans connected permanently with variable speed and a jumper link to enable them from

cold.

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 once 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.

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Coda C45 Guia do Utilizador Página 8