We are a Power Cord Manufacturers, our products include 3 Way Power Strip, etc. Let me introduce the maintenance skills of the power strip.

　　Maintenance Tips

　　The maintenance of switching power supply can be divided into two steps: in the case of power failure, "see, smell, ask, measure" Look: open the shell of the power supply, check whether the fuse is blown, and then observe the internal situation of the power supply, if the PCB board of the power supply is found If there is a scorched part or the component is broken, you should focus on checking the components and related circuit components here.

　　Smell: Smell the inside of the power supply to see if there is a mush smell, and check for burnt components.

　　Q: Ask about the damage to the power supply, and whether the power supply has been illegally operated.

　　Measure: Before power is turned on, use a multimeter to measure the voltage across the high-voltage capacitor. If the fault is caused by the switching power supply not vibrating or the switch tube being open, in most cases, the voltage at both ends of the high-voltage filter capacitor is not discharged. This voltage is more than 300 volts, so be careful. Use a multimeter to measure the forward and reverse resistance at both ends of the AC power line and the charging condition of the capacitor. The resistance value should not be too low, otherwise there may be a short circuit inside the power supply. Capacitors should be able to charge and discharge. Disconnect the load, and measure the resistance to ground of each group of output terminals. When normal, the needle should have a capacitor charge and discharge swing, and the last indication should be the resistance value of the bleeder resistor of this circuit. After power-on detection, observe whether the power supply has burning insurance and smoke from individual components. If there is, cut off the power supply in time for maintenance. Measure whether there is 300 volt output at both ends of the high-voltage filter capacitor, if not, focus on checking the rectifier diode, filter capacitor, etc. Measure whether the secondary coil of the high-frequency transformer has output. If not, check whether the switch tube is damaged, whether it vibrates, whether the protection circuit operates, etc. If there is, check the rectifier diodes, filter capacitors, three-way stability pressure pipe, etc. If the power supply stops once it starts, the power supply is in the protection state, and the voltage of the protection input pin of the PWM chip can be directly measured. If the voltage exceeds the specified value, it means that the power supply is in the protection state, and the reason for the protection should be checked.

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