How to use the hotel food ladder?

After the elevator runs for a period of time, check whether the brake clearance of the traction machine is correct and whether the clamping screw of the brake is loose. Then, adjust the position of the brake magnetic sensor to ensure the leveling accuracy. When the landing door of the elevator is stuck or can't be opened, check whether the landing door lock is faulty, whether the gap of the sliding block of the landing door is stuck or inclined, and whether the door rope falls off from the pulley groove of the rope.