1. Before maintenance, check whether the power supply shell is properly grounded;

2. Measure whether there is a voltage difference between the power box shell and the console or workbench;

3. The aviation plug of the power input cannot be wrongly inserted (the old power supply or the main control box may have the same aerial plug, and its function is different, plugging the wrong aerial plug may cause the internal control board to burn out or the internal components to explode);

4. There are many places in the box with high voltage, after power on, the metal part of the device can not be touched by the hand;

5. For measuring instruments (such as multimeters, oscilloscopes, etc.), measuring pens and tools (such as cutting pliers, etc.) should be checked for insulation;

6. When measuring voltage, confirm whether the gear is in the voltage gear. It is necessary to confirm that the range of the instrumentation should be greater than the voltage of the test point;

7. Before powering on, check whether the load is connected or whether the polarity is correct;

8. Before replacing the components in the power supply box, turn off the power and completely discharge the positive and negative poles of the energy storage capacitor (using 100Ω50W power resistors) and confirm that there is no voltage with the voltage file, then proceed to the next step of replacement or maintenance.

9. When replacing the components in the power supply box or the main control box, a mark can be made so that the wiring can be correctly connected during the replacement. It is especially important to pay attention to polar devices or high-current high-power devices. Otherwise, the device will be burnt out directly, and it may explode in severe cases;

10. After the device is replaced, the related devices should be measured before power-on to see if there is a short-circuit phenomenon (such as rectifier bridge, IGBT tube, power input and output part, power device input and output, etc.);

11. For the unstable operation of the machine or the good and bad working, you can check whether the screws and wiring terminals of the main circuit in the box are loose (may appear during transportation), the terminals are oxidized, etc., the old power supply or the use environment is poor The power supply should pay attention to whether there is a lot of dust inside (you can blow it off with an air gun); if there is a lot of oil in the box and the service life is very long, it should be discarded if it is not repairable.

12. During maintenance, for the power supply requested by the customer, it is not allowed to remove the internal cable tie, control panel, cut off the wiring or make random changes everywhere, which may cause interference to the whole machine or performance degradation. For example, when returning it, Many of the old power supplies do not have wiring diagrams due to standard problems, which may cause great difficulty in maintenance. In severe cases, they will be scrapped and will affect the reputation of customers or the company to a certain extent (Han's products promise lifetime maintenance).

13. The old-fashioned power supply cannot be repaired on site and needs to be returned to the head office. All the connecting wires of the upper and lower boxes should be returned together for more comprehensive inspection and maintenance.

14. The returned power supply or main control board should be protected against shocks on the surface to prevent the panel from being scratched, deformed or falling off the device, so as not to cause unnecessary losses to the company and bring some trouble to the maintenance work.

15. The returned power supply or main control board should have a label indicating the detailed faults on the power supply site, the name of the office, etc., to facilitate the analysis and maintenance of the maintenance technician. Sometimes there may be inconsistencies between the test on the whole machine and the separate test. Our maintenance personnel will make relevant maintenance records according to the label, and do a good job of tracking the maintenance of the laser power supply to improve the repair yield.

16. Old-fashioned semiconductor main control box or power supply box, if a fault is confirmed during maintenance, if it cannot be repaired on site, the whole power supply or main control box should be returned. (Products are continuously upgraded. For the old version more than two years old, it is impossible to repair and test the scattered control boards or main control boards in the production line)

17. If it has been repaired many times, and it is still unavailable to the customer, the wiring of the whole machine and other vulnerable parts should be checked on the spot. Check the cause of the failure. And make on-site inspection records and return them randomly.