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例1 台湾产SN—320子母无绳电话机,在使用中经常发生座机不能呼叫手机,即振铃不响、搞不了机的故障现象。分析与检修:首先检查座机,卸下座机下盖,掀开上盖,接通电源。用频率计测量发射通道的晶振频率为14.043 MHz,说明晶振工作正常。再测量座机拉杆天线发射频率,与说明书上手机接收频率一致。故判断座机发射电路工作正常。其次检查手机,将手机开关打在等待状态(即“ON”)时,按动座机上的呼叫键
Example 1 Taiwan produced SN-320 son of cordless phones, the use of landline phones often can not call, that is, the ring does not ring, can not handle the phenomenon of the machine. Analysis and Maintenance: First check the landline, remove the base cover, lift the cover, connect the power. The crystal oscillator frequency of the transmitting channel measured by the frequency meter is 14.043 MHz, which indicates that the crystal oscillator is working normally. And then measure the antenna rod antenna transmitting frequency, and instructions on the phone to receive the same frequency. It is judged that the landline transmitter circuit is working properly. Second check the phone, the phone switch hit the waiting state (ie “ON”), press the call button on the base phone