The Epson H842B projector manual provides detailed instructions on how to operate the device:
The user manual for the Epson H842B is the definitive source for all operational, maintenance, and safety information for this device. By using this guide to locate the official documentation and understand its key contents, you are well on your way to enjoying bright, clear projections for years to come. epson h842b projector manual
Here is the section for the Epson EB-H842B projector. (Note: The model number "H842B" appears to be part of the Epson EB-H842B series, a high-brightness installation projector). epson h842b projector manual
The contains 50+ pages on the menu system. Here is the cheat sheet: epson h842b projector manual