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一台供电话交换机使用的柜式直流稳压电源(规格为+60V/15A)经常出现无电压输出故障,导致交换机停机,不得已使用蓄电池应急供电。据用户反映,该电源曾经维修过多次,有时更换了电源调整管,有时则更换差动放大管之后,电源就恢复正常工作。但继续使用的时间短则一周,长则一个月,便可出现故障。接修该电源后,首先进行机外检查。接通市电交流电源,按动面板上复位开关,可以听到机内交流接触器
A cabinet DC power supply for telephone switches (specifications + 60V / 15A) often appear no voltage output failure, leading to switchboard shutdown, the battery had to resort to emergency power supply. According to user feedback, the power has been repaired several times, and sometimes replaced the power adjustment tube, and sometimes replace the differential amplifier, the power to resume normal work. But continue to use a short period of one week, a month long, you can failure. After the repair of the power, the first inspection of the aircraft outside. Connected to mains AC power, press the reset switch on the panel, you can hear the machine AC contactor