Nikon SB-400 User Manual

21

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

• Hz (frequency) is blinking time per second.

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.

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.