论文部分内容阅读
(七)稳压控制电路误差放大电路元件虚焊[例7]机型:菊花牌FS532A(东芝X-56P机芯)故障现象:不定期自动关机,有时自行恢复,有时则不能,关闭电源后又能工作,有时开启困难等。电路特点分析:(1)主开关电源电路采用自激式并联输出型,电路由全分立元器件组成,结构较复杂;(2)设有过压、过流、欠压保护电路,分别由Q805、R823、R822和Q805、R825以及R823、Q8807等组成;
(7) Regulated control circuit Error amplifier circuit components Weld [Example 7] Model: Chrysanthemum brand FS532A (Toshiba X-56P movement) Symptom: Occasional automatic shutdown, sometimes self-recovery, sometimes not, after the power is turned off Can work, sometimes open difficulties. Circuit characteristics of the analysis: (1) the main switch power supply circuit using self-excited parallel output type, the circuit consists of fully discrete components, the structure is more complex; (2) with overvoltage, overcurrent, undervoltage protection circuit, respectively, by the Q805 , R823, R822 and Q805, R825 and R823, Q8807 and other components;