Nikon D3400 Reference Manual - English - Page 310

Smudges appear in photographs: Clean front and rear lens elements. If problem persists, clean the image sensor manually (0 273) or contact a Nikon-authorized service representative. Date is not imprinted on photos: An NEF (RAW) option is selected for image quality (0 85, 202). Sound is not recorded with movies: Microphone off is selected for Movie settings > Microphone (0 141). Live view ends unexpectedly or does not start: Live view may end automatically to prevent damage to the camera's internal circuits if: • The ambient temperature is high • The camera has been used for extended periods in live view or to record movies • The camera has been used in continuous release modes for extended periods. If live view does not start when you attempt to start live view, wait for the internal circuits to cool and then try again. Note that the camera may feel warm to the touch, but this does not indicate a malfunction. Image artifacts appear during live view: "Noise" (randomly-spaced bright pixels, fog, or lines) and unexpected colors may appear if you zoom in on the view through the lens (0 38) during live view; in movies, the amount and distribution of randomly-spaced bright pixels, fog, and bright spots are affected by frame size and rate (0 141). Randomly-spaced bright pixels, fog, or bright spots may also arise as a result of increases in the temperature of the camera's internal circuits during live view; exit live view when the camera is not in use. Flicker or banding appears during live view or movie recording: Choose an option for Flicker reduction that matches the frequency of the local AC power supply (0 213). Bright bands appear during live view or movie recording: A flashing sign, flash, or other light source with brief duration was used during live view or movie recording. Menu item can not be selected: Some options are not available in all modes. 286 Technical Notes