How to change the lock of Hejing Lingfeng apartment?

1. Choose the appropriate door lock according to the size of the door and the size of the door opening. 2. Before installation, the inner handle must be removed. First, press down the locating card on the inner handle with the installation batch, push out the inner handle, and then unscrew the inner cover ring. 3. Adjust the position of the lock body: adjust the washer of the outer handle so that the center of the lock body is in the center of the door thickness. 4. Install the outer handle: firstly, install the lock tongue into the lock tongue hole at the door side, then insert the lock body from the outside and buckle the tail end of the lock tongue to combine the lock body with the lock tongue. 5. Install the fixing plate: cover the fixing plate on the outer handle part from the inside, then connect the outer handle part with two long screws and fasten it, and the outer cover ring is horizontally close to the door tappet. 6. Install the inner handle: put the gloves of the inner handle on the handle tube, and then push the inner handle to be clamped by the positioning clamp. 7. Try to close the door, draw a line horizontally with the center line of the lock body, confirm that the lock plate and the lock tongue are installed in the same position, mark with a pencil, and drill the installation hole according to the specifications of the lock box. 8. When installing the lock plate, it must be confirmed that the oblique tongue can enter the lock plate after the door is closed (and when the safety column is pressed by the lock plate, it can prevent the oblique tongue from retreating and play a role in safety insurance). Finally, screw the bolt and locking plate. If the door switch is smooth, the installation is successful.