Touch panel check operations
If touch [Touch panel check] of self-check, a black-filled screen is displayed over the entire screen area.
Touch a part of the screen.
The touched part becomes a yellow-filled display.
If touch the upper left part, returns to the self-check.
12.1 Diagnostic Functions
12.1.6 Touch panel check
Checking the upper left part of the screen
Only the upper left part of the screen cannot be filled with yellow.
If returnes to the self-check by touching the upper left part, judge that the upper left
area operates normally.
Upper-left touch position