【摘 要】
：
故障现象:接收不到U频段的CATV节目。分析与检修:该机属于M11型,并加装了遥控电路和全增补高频头机心,接收不到U频段节目,与该频道切换电路有关,见图1所示。为迅速查明故障,
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故障现象:接收不到U频段的CATV节目。分析与检修:该机属于M11型,并加装了遥控电路和全增补高频头机心,接收不到U频段节目,与该频道切换电路有关,见图1所示。为迅速查明故障,用DT890D数字万用表检测有关器件引脚的电压值,详见表1所示。显然U频段切换电压已丢失!经查,是开关三极?
Symptom: Can not receive CATV program in U band. Analysis and maintenance: This machine belongs to M11 type, and installed a remote control circuit and the full complement of tuner, can not receive U-band program, and the channel switching circuit, as shown in Figure 1. To quickly identify the fault, use the DT890D digital multimeter to measure the voltage at the device pins, as shown in Table 1. Obviously U-band switching voltage has been lost! The investigation, is the switch three-pole?
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