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故障现象:开机后“三无”,但有“吱吱”的响声。检修:测+B输出电压为48V,开关变压器次级+29V输出端只有11V。“三无”故障一般是由开关电源或行扫描电路有问题引起的(此例故障却由伴音电路造成)。本机开关电源和行扫描电路部分器件共
Symptom: boot “three noes”, but “creak” sound. Overhaul: Test + B output voltage is 48V, the output of the secondary transformer + 29V only 11V. “Three no” fault is generally caused by switching power supply or line scan circuit problems (in this case the fault is caused by the sound circuit). The local switching power supply and scanning circuit part of a total of devices