Resolution Steps:1.The engineer arr

Resolution Steps:1.The engineer arrived at the scene to confirm that the fault existed, the lock was powered off, but the card reader was working normally.2.Enter the IT room, and check that a power box status indicator is abnormal.3.Open the power box to check that the air switch is normal, and the power supply working status light is not working.4.The measured mains input voltage is normal, and there is no voltage output.5.Turn off the air switch and restart the power supply module. After the module is successfully restarted, the test output voltage returns to normal.6.The engineer checked that the power supply of the lock was restored, the access control was restored to normal use, and there was no abnormal situation during the on-site observation for half an hour.7.The customer has confirmed that the access control is back to normal, and the follow-up needs to pay attention to the specific reasons for this problem.