Mitsubishi Electric GT14 User Manual page 309

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Touch panel check operations
Touching [Touch panel check] of self-check displays a black-filled screen 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 returns to the self-check by touching the upper left part, judge that the upper left area operates normally.
1.
Touch a part of the screen.
The touched part becomes a yellow-filled display.
Yellow
color
2.
Touching the upper left part returns to the self-check.
15. GOT SELF CHECK (DEBUG AND SELF CHECK)
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15.2 Self Check
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