1) Obtain the site management right?
2) Remove the screws on the board panel.
Loosen the screws on the panel of the PSU board in the counter clockwise direction and remove the screws.
3) Removing the Faulty PSU
4) Install the new PSU in the slot of the faulty one.
5) Make sure that the new module operates normally.
After 30 seconds or so, the PSU module should have finished the startup and monitoring the communication process of the PMU if the power supply is normal; the input indicator (VIN) and the output indicator (VO) on the PSU panel both turn on.
6) Tighten the screws on the panel.
Tighten the screws on the panel in the clockwise direction if the new module operates normally
7) Release the site management right