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故障现象 无免提功能。 分析检修 检查该机的叉簧开关SA3-1、SA3-2是否接触良好,开关引线是否有脱落、虚焊现象,平衡变压器T1是否开路,稳压管V31是否工作正常。 故障现象 免提无接收。 分析检修 免提无接收信号时,主要检查功放部分:扬声器的焊线是否接好或脱焊、扬声器有无损坏、RP1是否开路或其触片接触是否不良、自锁开关SA4-1是否有虚焊或脱落、V19和V32是否开路或V39是否击穿短路、A3是否损坏等。此外,正常工作时A4D的14脚直流电压约2.8V,若C55漏电将使V39、V50导通,从而关闭接收通道。
Symptoms no hands-free function. Analysis and inspection of the machine to check the hook switch SA3-1, SA3-2 is in good contact with the switch lead off, Weld phenomenon, the balance transformer T1 is open, the regulator V31 is working properly. Symptom Hands-free without receiving. Analysis and maintenance Hands-free signal is not received, the main part of the amplifier to check: speaker wire is connected properly or desoldering, the speaker has no damage, RP1 is open or contact with the contact is bad, self-locking switch SA4-1 is virtual Solder or fall, V19 and V32 are open or V39 breakdown is short circuit, A3 is damaged and so on. In addition, the normal work of A4D 14 feet DC voltage of about 2.8V, if C55 leakage will V39, V50 conduction, thus closing the receiving channel.