Some bulbs need to be replaced as often as every three weeks in classrooms where the cumulative use by multiple professors is relatively high. I have noticed that most instructors already maximize the life of the bulb by allowing the projectors to cool down properly after each use. We should be able to reduce classroom downtime even further by having the instructors replace many of the bulbs directly. The major problems and their relative frequency of occurance are shown below. This is based upon my ancedoctal experience in our building and my discussions with campus service technicians.
Faculty are welcome to maintain a small personal supply of bulbs as well.
Wait at least 10 minutes for the projector to cool down before you attempt to replace the bulb. If you cannot wait that long, borrow a projector from another classroom and return it when you are done. Disconnect the power cord from the wall. Remove the blown bulb by gently pushing it into the spring-loaded rear contact and then tilting the front up. Be careful not to break the bulb.