Casio PA-2400U Service Manual And Parts List page 54

TEST
Display
No.
9-2
9-3
9-4
9-5
9-6
Operation
Tap center of the display.
Tap center of the display.
Tap center of the display.
Tap center of the display.
Tap center of the display.
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Result
Displays horizontal lines.
Displays checker.
Displays reverse checker.
Displays as shown adove.
Displays gradation.