What kind of maintenance is required by the projector and dome?
Very little. The projector lens will need to be cleaned from time to time with a soft, lint-free cloth and alcohol (see your user manual for more information), and lamps will need to be replaced when they burn out or reach the end of their design life (the projector tracks usage information for you). You should have your system checked for dust accumulation once a year and cleaned if necessary. The dome can be cleaned with a damp sponge if needed.
