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随着家用电话机的普及,电话机的故障就相对比较常见。本文以HAC—2型电话机为例,介绍其通话故障、拨发号及振铃部分故障的排除,供参考。1.受话失真及无声一般受话失真,其原因主要是三极管工作点不合适或三极管老化变质、耦合电容严重漏电、受话器变质损坏等。在检修时应首先检查1V7、4V3工作点是否稳定适中,1C9是否变质,必要时,可用替换对比法检查1V7、1V8、3V1及受话器是否性能变差等。受话无声,是指话机拨号正常,话音信号能送
With the popularity of home telephones, phone failures are relatively common. In this paper, HAC-2-type phone, for example, describes the call failure, dialing number and ringing part of the troubleshooting, for reference. 1. Receiving distortion and speechless general received speech distortion, the main reason is the improper work of the transistor or transistor deterioration, coupling capacitance serious leakage, deterioration of the receiver deterioration. In the overhaul should first check 1V7, 4V3 work point is stable and moderate, 1C9 is metamorphism, if necessary, available replacement comparison method to check 1V7, 1V8, 3V1 and receiver performance deterioration. Quietly speaking, refers to the normal dialing phone, voice signal can be sent