Nikon D40 manual Technical Notes/Troubleshooting

Problem	Solution
	• Manual focus selected: if AF-S or AF-I lens is attached,	28, 97
	choose autofocus mode. Otherwise focus manually.
Image in viewfinder is not in focus.	• Camera unable to focus using autofocus: use manual	26, 28
	focus or focus lock.
	• Lens is not AF-S or AF-I: use manual focus.	28, 97
	• Mode dial rotated to or : select another mode.	4, 18–19
	• AF-assist lamp does not light for manual focus or	23
	continuous-servo autofocus. Choose AF-S.
	• Center focus area is not selected: select center focus	25
AF-assist illuminator does not light.	area
	• Choose On for Custom Setting 9 (AF-assist).	76
	• Illuminator has turned off automatically. Illuminator	—
	may become hot with continued use; wait for lamp
	to cool down.
	• Memory card is full, locked, or not inserted.	12, 13,
		15
	• Flash is charging.	17
	• Camera is not in focus.	23
Shutter release is disabled.	• CPU lens with aperture ring attached without lock-	8, 39
	ing aperture at highest f/-number.
	• Non-CPU lens is attached: rotate camera mode dial	39, 43,
	to M.	45
	• Mode dial rotated to S after shutter speed of bulb	41, 43
	selected in mode M: choose new shutter speed.
	• Replace battery in remote control.	103
	• Choose remote control mode.	33
No photo taken when remote con-	• Flash is charging.	17
trol shutter-release button is	• Time selected for Custom Setting 17 (Remote on	79
pressed.	duration) has passed: reselect remote control
	mode.
	• Bright light is interfering with remote.	—
Only one shot taken each time shut-	Continuous shooting is not available when built-in	32, 34,
ter-release button is pressed in con-
tinuous shooting mode.	flash is required.	36
Camera is slow to record photos.	Turn noise reduction off.	73
Date of recording is not correct.	Set camera clock.	11
Final photo is larger than area	Viewfinder horizontal and vertical frame coverage is	—
shown in viewfinder.	approximately 95%.
Randomly-spaced bright pixels	• Lower ISO sensitivity or use noise reduction.	37, 73
(“noise”) appears in photographs.	• Shutter speed is slower than 1s: use noise reduction.	73
	Reddish areas may appear in long time-exposures.
Reddish areas appear in photos.	Turn noise reduction on when shooting at shutter	44, 73
	speeds of “bulb” or “--”.

Technical Notes/Troubleshooting 109