Most copiers manufactured today have a energy saving mode or "sleep mode" so you don't have to turn the device off at the end of the day. Leave the copier on and this will help dry out any moisture that may be present in the copier and on the paper inside of the copier. Also, this helps in the "warming up" process the copier has to go through before operating. Just make sure your copier is connected to a power line filter or surge protector in case of a power failure.