Flashlight is an essential daily necessities, when the switch is not good, how to check.

1. Determine the fault: unscrew the tail and expose the negative battery terminal. Connect the negative battery terminal with a metal sheet such as scissors or tweezers and the exposed unoxidized part of the strong light flashlight beside the battery to see if it is lit. If you can, it is the problem of the switch of the strong light flashlight, please check according to step 3; If it is not bright, please check whether the tin welding at the connection between the circuit bin and the circuit board is open welding or virtual welding. If it is, please weld it again to solve the problem.

                                            
2. Check the battery: make sure the battery has power and load the battery in the correct direction. Do not use different models of battery, and do not mix the old and new batteries.

3. check the tail cover switch: unscrew the tail of the LED flashlight, you can see that the outer ring of the switch spring has a switch pressure ring with two concave points, do not rotate clockwise with tweezers or scissors on a concave point, check whether the switch pressure ring is loose, ensure that the switch pressure ring is tight on the switch, can not be loose.

4. before maintenance, please ensure that the thread of the explosion-proof flashlight is not loose, if the thread is not tightened, it may also be the cause of not bright or slightly bright.