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A48为黑白图像处理器。
<phenomenon> ( all other functions are okay except the following)
Error message "Calibration error" occurs.
<suspect cause>
BWPR PWB
You can find "Under Calibration" during boot-up sometimes. This message appears when the date is changed and first turn on that day. This calibration is a kind f B-mode image gain fine tuning done by BWPR PWB. Calibration error occurs if this is malfunctioning. | 
