Canon LBP7780CX User Manual page 552

(1) [Error Information] (Number of Errors)
It displays whether or not errors have occurred, and if there are errors, the number of errors.
(2) [Error Information] (Information)
It displays status and solutions for the error information occurring in the printer.
The meanings of the displayed icons are shown below.
(3) Update Button
It refreshes the [Error Information] page display to the latest status.
(4) [Back to Page Top]
It moves the scroll box up to the top of the page.
[Device Features] Page
The printer equipment information and the functions that can be used in the current equipment status are displayed.