Epson 836XL - Manual (Page 23)

Scanner Basics Page 23
Lights and Buttons
OPERATE light (green)
Comes on when the scanner is turned on.
READY light (green)
Comes on when the scanner is ready to scan and flashes
during scanning. When an error occurs, the type of error is
indicated by both the READY and ERROR lights, as listed in
Scanner Errors .
ERROR light
OPERATE light READY light
RESET button
OPERATE button