Mitsubishi Electric GT16 User Manual page 240

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Touch panel check operations
If touch [Touch panel check] of self-check, a black-filled screen is displayed over the entire screen area.
Black-filled screen
Upper-left touch position
POINT POINT POINT
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.
14 - 14
14. SELF CHECK
14.1 Diagnostic Functions
1.
Yellow
color
2.
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.