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1.有的黑白电视接收机,电源稳压电路采用由行输出升压点取电压做辅助电源,该电路稳压性能好。但当行输出电路或稳压电路故障时,都会引起稳压输出过低,而且不易区别故障所在。遇此现象可将行输出级供电电源断开,把辅助电源去掉;再把稳压电路中的启动二级管换一电阻,改动后接通电源。此时如稳压输出正常,则为行输出级故障;如稳压输出仍不正常,则是稳压电路故障。 2.东芝(31cm)黑白电视机。其行推动级E_(cc),是由行输出升压(16V)供电。当换用性
1. Some black and white TV receivers, power supply voltage regulator circuit by the output voltage step-up point to take auxiliary power supply, the circuit regulator performance. However, when the line output circuit or regulator circuit failure, will cause the regulator output is too low, but not easy to distinguish the fault. In case of this phenomenon, the line output stage power supply can be disconnected and the auxiliary power can be removed. Then, the start-up diode in the voltage stabilizing circuit can be changed to a resistance, and the power can be switched on after the change. At this point, such as the regulator output is normal, then the line output level fault; such as regulator output is still not normal, it is the regulator circuit fault. 2. Toshiba (31cm) black and white TV. The line promotion level E_ (cc), is the line output boost (16V) power supply. When changing sex