Qsc-audio CX168 User Manual download pdf (Page 17)

OPERATION: LED INDICATORS

CLIP : Each channel has a red ‘clip’ LED that illumi-

nates when the channel clips. It is located to the upper-

right of each channel’s gain control.

Normal indication:

illuminates briefly at extreme

output power peaks. Occasional clipping at high power

levels may be normal. At power-on, the clip LEDs may

briefly flash during turn-on muting.

Continuous operation at high power may trigger the

thermal protection circuitry, shutting down the amplifier

and fully illuminating the clip LED. Operation will

resume after the amplifier has cooled down sufficiently.

SIGNAL: Each channel has a green ‘signal’ LED

located to the right of its gain control. The ‘signal’ LED

lights up when the input signal is sufficiently strong.

Normal indication:

illuminates when the input signal

is present and sufficiently strong.

POWER: The power ‘on’ indicator LED is located at the

upper-left of the gain control cluster. It is green and

illuminates when the power switch is set to the on

position and AC power is present at the IEC cord

receptacle.

Normal indication:

at power-on the LED will illumi-

nate.

If no indication:

check gain settings, input cables,

connections and audio source. If audio source is

extremely low signal strength, signal LED may not

illuminate; this is normal but indicates that the input

signal strength should be increased.

Occasional illumination:

normal for weak input

signal strength.

Fully illuminated (on):

normal.

If no indication:

Check AC power cord, AC mains, and

that the DataPort is not being used to force the

amplifier into ‘Standby’ mode.

When power is switched off:

the LED may take

several seconds to extinguish (go out); this is normal.

If no indication:

normal if the amplifier is operated at

nominal output levels. If the input signal is weak, it may

not be capable of driving the amplifier into clipping,

even at full gain.

Occasional illumination:

Occasional clipping (once

briefly every few seconds) when operation at high

power levels does not indicate trouble. Continuous

operation at high power may trigger the thermal

protection circuitry, shutting down the amplifier and

fully illuminating the clip LED.

Illuminated most of the time:

Not normal; for cleaner

sound, reduce the output of the amplifier and/or input

signal to avoid thermal shutdown of the amplifier and

possible speaker damage. If clipping persists at normal

levels, check for shorted or abnormal load impedances.

Fully illuminated (on):

Amplifier is in thermal shut

down. Reduce gain settings or input signal and allow

the amp to cool down. Leave the power on so that the

fan continues to run; operation will automatically

resume after the amplifier has cooled sufficiently.

LED Indicators

The LED indicators provide basic operation information to the operator. The ‘nor-

mal’ indications of the LED’s are shown, below. NOTE! The BRDG and PAR mode

indicator LED’s are discussed on page 9.

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Qsc-audio CX168 User Manual Page 17

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