Sony DVW-707/707P Operation Manual page 90

If a memory error occurs
If the error message ": STORED DATA : NG" flashes on the viewfinder
screen when the camcorder is turned on, the white balance memory
content has been lost.
Adjust the black balance and the white balance again. Contact your Sony
representative if this message continues to appear even after the black
balance and the white balance have been adjusted again.
For more information, refer to "maintenance manual."
4
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Chapter 4 Adjustments and Settings for Recording