Casio PX-780 - Backlight Brightness Restriction by Temperature

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6 Restriction on the brightness of the backlight imposed by the temperature sensor
 When the temperature sensor detects the increase of the temperature on the device, it automatically
restrictsthebrightnessofthebacklight.(Theautomaticrestrictiononthebrightnessofthebacklightworks
whenthedeviceisbatteryoperatedandalsowhenitisoperatedbyanexternalpowersource).
* Thisrestrictionhastwophases;therstphaseoftherestrictiononthebrightnessofthebacklighthas8
steps,andbacklightsettingisrestrictedwithinthese8steps.Thesecondphaseoftherestrictionhas9
steps,andbacklightsettingisrestricteduptothe6thsteps.
* Whenthe setting of the brightness in the normal state or when the automatic dimmer function works
(onlywhenthedeviceisbatteryoperated)isbrighterthanthevalidrange(steps)ofthebrightnessunder
restriction, the backlight automatically becomes dimmer to the brightest setting within the restricted
range;whenthetemperatureofthedevicebecomelowerwhichcancelstherestriction,thebrightness
returnstothatoftheoriginalsetting.