Samsung DVW-707/707P - Manual (Page 114)

Chapter 4 Adjustments and Settings for Recording
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4
Changing the power supply from the battery pack to an
external power supply during time code synchronization
To maintain a continuous power supply, connect the external power
supply to the DC IN connector before removing the battery pack. You
may lose time code synchronization if you remove the battery pack first.
Camera synchronization during time code synchronization
During time code synchronization, the camera is genlocked to the
reference video signal input from the GENLOCK IN connector.