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故障现象:一台三洋 CLT-6700型无绳电话机,该机的主机工作正常,子机不能拨打电话,也不能同主机进行通话。据了解是由于子机被摔而造成这种现象。分析检修:根据故障现象及了解的情况,判断故障应在子机电路。分析造成故障的原因主要有:1.子机电路所用晶振损坏;2.子机电路的贴片元件被摔脱落或引脚接触不良;3.印制板被摔裂,使其铜箔断裂等。拆开子机后盖,从内部掉下一小块印制板,经检查其应位于子机上层印制板顶端螺钉固定处,该印制板上仅有一根较粗的接地线;另外,发现上层印制板上的带通滤波器 XF351(10.7MHz)的
Symptoms: a Sanyo CLT-6700-type cordless phone, the machine’s main machine is working properly, the sub-machine can not make calls, it can not talk with the host. It is understood that due to the sub-machine is caused by this phenomenon. Analysis and maintenance: According to the symptoms and understand the situation, determine the fault should be sub-machine circuit. Analysis of the main reasons for the failure are: 1. The sub-machine crystal used in the crystal damage; 2. The sub-circuit chip components are falling off or poor pin contact; 3. PCB is broken, so that the copper foil rupture, etc. . Disassemble the back cover of the sub-machine and drop a small printed board from the inside. After checking, it should be located at the top of the top plate of the sub-machine PCB with a thicker grounding wire. In addition, Found on the upper PCB bandpass filter XF351 (10.7MHz)