Hitachi PH Instruction Manual page 158

Hold down the + mark at the top left and bottom right until the
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system displays a confirmation message for Touch Screen
Coordinate Correction.
The touch screen coordinate correction confirmation message then appears.
Touch Screen Coordinate Correction
Touch screen coordinate correction will be applied.
To return to the previous setting, press [Cancel].
Solution Press [OK]
OK
Press OK .
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The system then corrects the coordinates and returns you to the auxiliary
function menu.
Cancel
● Calibrating the Touch Screen Coordinates 5-19