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我们知道,在自动搜台时微处理器依靠从主板反馈给CPU的两个信号作为收到电台的识别信号:(1)行同步脉冲信号;(2)中放AFT“突变”信号(电压)。我们先来区分不能锁台(存台)的原因:是由于CPU没有行同步信号造成的,还是中放AFT频偏造成的?区分方法是:用手动方式调出一个台,如调准后,一松手台立刻跑掉,则故障必是AFT频偏;或者将电
We know that the microprocessor automatically relies on the two signals fed back to the CPU from the main board as the identification signal of the receiving station: (1) the line sync pulse signal; (2) the AFT “abrupt” signal (voltage) . We first to distinguish between the reasons can not lock station (deposit station): is due to the CPU is not caused by line synchronization signal, or placed in the AFT frequency offset caused? The distinction is: manually adjust a station, such as alignment, A loose hands immediately ran away, the fault must be AFT frequency deviation; or electricity