论文部分内容阅读
例1 机型:HA9868(V1)P/TSDL 故障现象:不能振铃,手柄、免提均正常。分析检修:一般认为,振铃和免提共用喇叭SP,免提正常就可排除喇叭不良的因素。在振铃状态测量T301初级有约3V的铃流电压,次级有约0.5V的铃流电压,在喇叭两端也有约0.5V的铃流电压,说明振铃电路正常,故障在喇叭,这与前面的分析矛盾。焊下喇叭,测其直流电阻约为150Ω,正常值应是8Ω。估计喇叭线圈接头
Example 1 Model: HA9868 (V1) P / TSDL Symptom: Can not ring, handle, hands-free are normal. Analysis and maintenance: It is generally believed that ringing and hands-free speaker SP, hands-free normal exclusion of bad speakers. In the ringing state measurement T301 primary ring current voltage of about 3V, the secondary has a ringing voltage of about 0.5V, at both ends of the speaker also has a ringing voltage of about 0.5V, indicating the ringing circuit is normal, the fault in the speaker, which Contradictory with the previous analysis. Under the welding horn, measured the DC resistance of about 150Ω, the normal value should be 8Ω. Estimated speaker coil connector