Mitsubishi Electric GT1695M-XTBD User Manual page 262

3 Touch panel check operations
If touch [Touch panel check] of self-check, a black-filled screen is displayed over the entire screen area.
1 Touch a part of the screen.
The touched part becomes a yellow-filled display.
2 If touch the upper left part, returns to the self-check.
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Remark
12
12.1 Diagnostic Functions
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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.
Black-filled screen
Upper-left touch position
Yellow
color