Sony DSC-D770 - Manual (Page 115)

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Miscellaneous
Warning Indicators
LCD Monitor
The following warning indicators appear on the LCD monitor.
Low Battery Charge Indicator
When the battery voltage becomes low, the remaining
battery time indicator on the LCD monitor changes to the
indicator.*
* When using the AC power adaptor/charger, this
indicator does not appear.
CARD FULL No Shot Available
If you press the release button when the picture file on
the card is full, the message CARD FULL is displayed in
red for 4 seconds.
To remove this indicator, erase pictures from the file or
insert a new card.