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一台HA-7307型电话机的振铃电路由常见的CS8204集成电路和外围元器件组成。故障现象:振铃声单调。分析与梭修:CS8204第③、④、⑥、⑦脚为低频和高频振荡器。如果上述引脚的外围元件有击穿、损坏,必然造成铃声单凋。故应首先检查第③、④脚的阻容元件,发现IC第④脚外接R2电阻虚焊,用锡补焊好后,故障排除。故障现象:无铃声。分析与检修:若CS8204第③脚所接的时间常数电容两端未见20～29V电压,则可能是极
The ringing circuit of a HA-7307 phone consists of a common CS8204 integrated circuit and peripheral components. Symptom: Ring tones monotonous. Analysis and shuttle repair: CS8204 ③, ④, ⑥, ⑦ feet for the low frequency and high frequency oscillator. If the above pin peripheral components breakdown, damage, will inevitably cause the ring single withered. Therefore, we should first check the first ③, ④ feet of RC components and found that the IC ④ pin external resistance R2 resistance Weld, tin solder repair, troubleshooting. Symptoms: no ringtones. Analysis and Overhaul: If the CS8204 ③ pin connected to the time constant capacitor voltage is not seen at both ends of 20 ~ 29V, it may be extremely