VENTA PRO (serv.man26). Screen brightness adjustment on the UP-X500 - Sharp EPOS Technical Bulletin (repair manual). Page 4

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5.
Tap the ‘S3 Gamma Plus’ tab.
6.
Hold the tip of your finger on the dark inner circle. You should then see 
two circular arrows appear on the screen where your finger is touching.
7. 
Still with your finger making contact with the display, move your finger
left to right, like using a rotary control.  You will observe the value
changing and the displays brightness or contrast as you move the control.
8. 
Once adjusted as required, release your finger and tap the 'Apply' button,
then tap 'OK' and ‘OK’ again.  Tap the X on the top right hand corner to
close the control panel.
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