Installation steps: 1. Remove the screw at the bottom of the receiver with a screw knife. After removing, open the bottom cover and take out the whole circuit board to connect the power cord of the projection screen. 2. Please look carefully at the wiring diagram on the receiver. AC220V is the side connected to the power socket, with positive and negative interfaces. Please note that these two lines must not touch the line. 3. The center line and the rising line. This side of the falling line is connected to the other end of the projection screen. Three lines are connected inside. It must also be connected well. Don't touch the line. 4. After connecting, put it back into the receiver, lock the screw, and try it. If it can only go up and down, and it can't stop, that is, the descending line should be adjusted with the center line, or if it can only go down, the ascending line should be adjusted back with the center line.