Samsung L830 Service Manual page 46

7) SHUTTER CLOSE TIME ADJ
You can adjust the close timing of the camera's mechanical shutter.
Compensate for a particular camera's shutter timing deviation because each individual camera is different.
< Adjustment Procedures >
a...Prepare an AE Tester that supports LV of 16.0±0.1.
b...Place the camera onto the AE Tester.
* The luminance specification for the Light Source Box is 13 LV.
* The Colour Temperature of the Light Box is 3300K.
c...Install the SD card containing the program file and turn the camera on.
d...The adjustment is conducted automatically.
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Ⅲ. ADJUSTMENT