Nikon D780 DSLR Camera (Body Only) - Manual (Page 799)

753 Troubleshooting
Solutions to some common issues are listed below.
Battery/Display
Problems and Solutions
The camera is on but does not respond:
• Wait for recording and other operations to end.
• If the problem persists, turn the camera off.
• If the camera does not turn off, remove and reinsert the battery.
• If you are using an AC adapter, disconnect and reconnect the AC
adapter.
- Any data currently being recorded will be lost.
- Data that have already been recorded are not affected by
removing or disconnecting the power source.
The viewfinder is out of focus:
• Rotate the diopter adjustment control to adjust viewfinder focus.
• If adjusting viewfinder focus does not correct the problem, set the
autofocus mode to
AF-S and the AF-area mode to [ Single-point
AF ]. Next, select the center focus point, choose a high-contrast
subject, and focus using autofocus. With the camera in focus, use
the diopter adjustment control to bring the subject into clear focus
in the viewfinder.
• If necessary, viewfinder focus can be further adjusted using optional
corrective lenses.
The viewfinder is dark:
Is the battery charged? The viewfinder may dim if the battery is
exhausted or not inserted.