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１故障现象：某日晚间，一小片用户突然无信号。故障分析：小片用户无信号，故障范围不大，排除前端出现故障。故障出现突然，有三种可能：一是停电；二是放大器损坏；三是电缆短路。故障处理：用仪器测放大器未损坏，测输入信号电平正常，测放大器电源无电压，说明放大器...
1 Symptom: One night, a small piece of user suddenly no signal. Failure Analysis: Small pieces of users no signal, the scope of the fault is not, remove the front-end failure. Fault suddenly, there are three possibilities: First, power outages; the second is the amplifier damage; Third, short-circuit the cable. Troubleshooting: Instrument Amplifier is not damaged, measuring input signal level is normal, measuring amplifier power supply without voltage, indicating amplifier ...