数据埠 Operation; Ac Power Switch; Ac 电源开关 Led Indicators; Led 指示灯 Gain Controls - QSC DCA1222 User Manual

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OPERATION

AC power switch

Before applying power, check all connections and turn down the gain controls.
The "soft start" sequence starts with the POWER indicator LED at half bright-
ness. A couple seconds later the fan starts and the amplifi er cycles through one
second of protective muting, indicated by the CLIP LEDs glowing bright red. The
POWER indicator then changes to full brightness and the amplifi er is ready.
LED indicators
At full brightness, the green POWER LED indicates that the amplifi er is operat-
ing. Half brightness means the amp is in its startup sequence.
As the signal increases, the green SIGNAL, -20dB, and -10dB LED indicators
light respectively at 0.1%, 1% and 10% of full power.
The red CLIP LED indicator fl ashes during overload (clipping). A bright, steady
glow indicates protective muting. If this occurs during use, see Troubleshoot-
ing.
The yellow BRIDGE LED indicates the amp is in bridged mono mode.
The yellow PARALLEL LED indicates the Parallel Input switches are set.
Gain controls
The gain controls are detented for repeatable adjustment. The actual voltage
gain of the amplifi er is shown in dB. Maximum gain is 40×, or +32 dB.
操作
交流电源开关
接通电源前，请检查所有连接，并关闭增益控制器。"软启动"
顺序从一半亮度的电源 指示灯 LED 开始。几秒钟后风扇启动，
并且放大器会经过一秒钟的保护性静音，如亮红色发光的削波
LED 所指示。然后电源 指示灯将变为全亮度，放大器至此已就
绪。
LED 指示灯
在全亮度下，绿色电源 LED 表示放大器正在运行中。一半亮度表
示放大器处于启动过程中。
随着信号的增强，绿色信号、-20dB 和 -10dB LED 指示灯将依次在
接通全电源的 0.1%、1% 和 10% 时点亮。
过载时，红色 LED 削波指示灯会闪动（正在削波）。明亮稳定
发光表示处于保护性静音模式中。如果使用中发生此情况，请参
阅"故障排除"部分。
黄色桥接 LED 表示放大器处于桥接单声模式。
黄色并行 LED 表示设置了并行输入开关。
增益控制器
使用增益控制器可平缓进行重复调整。放大器的实际电压增益以
dB 为单位显示。最大增益为 40 倍或 +32 dB。
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