Casio EX-843 Service Manual page 22

Backlight
0 Check that the intensity of the backlight is adjustable.
Tap "Backlight" I
Move the slider and check that the brightness of the
screen changes accordingly.
1
When you lift your fi nger from the screen, the
judgment screen appears.
Tap the test result to return to the menu screen.
2
USB Storage
0 Carry out the USB storage test.
0 Make sure that the USB memory is already inserted.
Tap "USB Storage".
1
Automatic judgment is done and the test result appears on the menu screen.
Internal Storage
0 Carry out the Internal storage test.
Tap "Internal Storage".
1
Automatic judgment is done and the test result appears on the menu screen.
tap any place on the screen.
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V-R200 / VER.2