故障现象:开机行输出“吱吱”叫,时间长后,烧“行管”。分析与检修:此现象说明故障系行激励不足所致。测V401、T401电压均正常。试代换V401(2SC2482)、行激励变压器、“行变”等无效。后来分析,发现行激励还与听伴音控制电路有关系。于是断开听伴音电路三极管后,一切正常。看来问题就出在听伴音控制电路上。在 Symptoms: boot line output “creak ” call, after a long time, burning “governs ”. Analysis and overhaul: This phenomenon shows that the failure caused by insufficient incentives. Measure V401, T401 voltage are normal. Try to replace V401 (2SC2482), line excitation transformer, “line change ” and so invalid. Later analysis, found that line incentives and listening sound control circuit also has a relationship. So disconnect the listening sound transistor, everything is normal. It seems the problem is listening to sound control circuit. in