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例1 机型:SANTAK UPS—500(后备式) 故障现象:市电供电正常,逆变时,蜂鸣器间隙鸣叫,但输出电压异常,且为265V。分析与维修:市电供电正常,说明交流稳压电路无故障,故障多在逆变供电电路的自动稳压电路。它是由T_2、D_1、D_2、R_1、VR_1、C_1组成。UPS电源输出经T_2降压,D_1、D_2全波整流,C_1滤波后送到U_1(SG3524)的①脚,调节VR_1,逆变时输出电压变化不大,用万用表测量U_1的①脚电庄为1.01V(正常值为
Example 1 Model: SANTAK UPS-500 (Backup) Symptom: The mains supply is normal and the inverter beeps at buzzer intervals but the output voltage is abnormal and is 265V. Analysis and Maintenance: Mains supply is normal, indicating that the AC voltage regulator circuit is fault-free, and the fault is mostly in the automatic voltage regulator circuit of the inverter power supply circuit. It consists of T_2, D_1, D_2, R_1, VR_1, C_1. UPS power output by the T_2 step-down, D_1, D_2 full-wave rectification, C_1 filter sent to U_1 (SG3524) ① feet, adjust VR_1, inverter output voltage change is not big, with a multimeter to measure U_1 ① 1.01V (normal value is