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Troubleshooting
If a warning indication appears on the SB-400's ready-light or inside the
camera's viewfinder, use the following chart to determine the cause of the
problem before you take your Speedlight to a Nikon service center for repair.
Warning indication inside the camera's viewfinder
When the ready-light on the SB-400 blinks
• Hz (frequency) is blinking time per second.
Warning indication Cause Procedure
The ready-light in the
viewfinder blinks for 3
sec. after firing.
Underexposure may
have occurred.
• Shorten the shooting distance.
• Set camera’s aperture to a larger
(f/3.5, f/4.5 or f/5.6).
• Set the camera's ISO sensitivity
higher.
When mounted to the
D40, blinks in the
camera's viewfinder.
Lens' focal length is set
shorter than 18mm.
• Set the focal length longer than
18mm.
When mounted to the
D40, blinks in the
camera's viewfinder.
The flash head of the
SB-400 is not set to the
horizontal position.
• For bounce flash shooting, take
the picture without any change.
• For standard flash shooting, tilt the
flash head to the horizontal position.
Ready-light blinks Cause Procedure
The ready-light blinks
for 3 sec. at 4 Hz.
Underexposure may
have occurred.
• Shorten the shooting distance.
• Set camera’s aperture to a larger
(f/3.5, f/4.5 or f/5.6).
• Set camera's the ISO sensitivity higher.
The ready-light blinks
for 40 sec. at 2 Hz.
Battery power is not
enough.
• Replace or recharge batteries.
The ready-light blinks at
interval of 0.5 sec. at 8
Hz.
The SB-400 is mounted to a camera which is not compatible
with CLS (SB-400 is usable only with cameras compatible with
CLS).
The ready-light blinks at
1 Hz.
The body temperature
becomes high because
of repeating flash or
other cause.
• Wait until the body temperature
drops and ready-light turns on
again.