Nikon D3400 Triple Lens Parent's Kit Owner's Manual

282 Technical Notes

If the camera fails to function as expected, check the list of 
common problems below before consulting your retailer or 
Nikon-authorized service representative.

: Wait for recording to end. If the 

problem persists, turn the camera off. If the camera does not turn off, 
remove and reinsert the battery or, if you are using an AC adapter, 
disconnect and reconnect the AC adapter. Note that although any data 
currently being recorded will be lost, data that have already been 
recorded will not be affected by removing or disconnecting the power 
source.

: The camera is performing an image sensor 

check. Do not remove the battery or disconnect the AC adapter until the 
camera has turned off.

: Adjust viewfinder focus (

0 26). If this does not 

correct the problem, select single-servo autofocus (AF-S; 

0 69), single-

point AF (

c; 0 74), and the center focus point, and then frame a high-

contrast subject in the center focus point and press the shutter-release 
button halfway to focus the camera. 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 (

: Choose longer delays for Auto off timers 

: Shutter-release button is 

pressed halfway. If information display does not appear when you 
remove your finger from shutter-release button, confirm that On is 
selected for Auto info display (

0 206) and that battery is charged.

: The response times and brightness 

of this display vary with temperature.