10
EN
TD-000077-00-K
An asterisk (*)indicates the model is rated for the load.
(S/P)= Stereo/Parallel mode (Br.)= Bridge mode
LED Indicators
The LED indicators can be used to monitor system operation and identify common problems.
(Figure 20
and
Figure 21)
POWER:
GREEN, above the BRIDGE (BRDG) and PARALLEL (PAR) indicators.
Normal indication:
AC switch ON: LED will illuminate.
If no indication:
Check AC power cord and AC outlet. Confirm that DataPort 1-2 is not holding the
amp in 'Standby' mode.
CLIP:
RED, adjacent the channel number markings.
Normal indication:
illuminates whenever the amplifier is driven beyond full power. The resulting
distortion corresponds to the brightness of the LED. Distortion that causes only brief flashing may not be
audible.
• During muting, the LED fully illuminates. This occurs during normal "On-Off" muting.
Abnormal indication:
• Bright red illumination while the amp is being used indicates either thermal
muting or a shorted output.
• If the amplifier overheats, the fan will run at full speed, and operation should
resume within one minute. Allow the fan to run, and make sure the amplifier
ventilation is adequate.
• A shorted or overloaded output circuit will cause excessive Clip flashing and
possible overheating.
If distortion is audible without a Clip indication, the problem is either before or
after the amplifier. Check for damaged speakers or overloaded signal source. The amplifier Gain control should be in the upper half of its range to
prevent input overload.
SIGNAL, -20dB, -10dB:
GREEN, under each Clip LED.
Normal indication:
The SIGNAL indicator illuminates when the input signal exceeds -35 dB, the -20dB indicator illuminates when the signal
exceeds -20dB, and the -10dB indicator illuminates when the signal exceeds -10dB.
If no indication:
check Gain settings and increase gain if necessary. Check input connections and audio source for signal. If the Clip LED
illuminates with little or no Signal indication, check the output wiring for shorts.
Abnormal indication:
If the SIGNAL (SIG), -20dB, or -10dB LED illuminates with no signal input, there may be system oscillations or some other
malfunction. Disconnect the load and fully reduce the gain. If the LED remains on, the amp may need servicing.
BRDG and PAR (Bridged and Parallel):
Each channel pair has a YELLOW LED for Bridge Mode, and an ORANGE LED for Parallel mode. These show how the rear panel switches are set
(see Setting the Mode Switches). In Stereo mode, both LEDs should be OFF.
Two-Channel Models
— Figure 20 —
Four-Channel Models
— Figure 21 —
Summary of Contents for CX302
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Page 89: ...89 TD 000077 00 K AR QSC CX 70 QSC QSC XLR 10 20 200 140 50 100 70 25 CX302 IT 42 CX 3...
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