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OPERATION CAUTIONS: Please refer to below procedures to check if the projector lift is out of order. 1.Make sure the power cord connected properly and be with regular power supply. 2.Do not operate it frequently. 3.Let the motor stop for 15 minutes, then turn it on again to check if the motor is in an overheating protection statement. If the problem still remains unsolved, please contact with us or the dealers for further assistance.