To use this Vivitek D8800 projector, first make sure you connect it to the correct power supply that comes with it. When setting it up in a large venue, find a stable place to place it. Keep in mind that the lamp replacement lights are on because of high usage hours, so you might want to think about replacing the lamps soon. Also, since there are dents and marks on the housing and a loose plastic piece inside, handle the projector gently. For maintenance, keep it in a clean and dry environment. Wipe the exterior regularly with a soft cloth. Don't use harsh chemicals to clean it. If you notice any new problems, it's best to consult a professional.