Nikon SB-5000 Reference Manual page 169

Warning indicator
The flash-ready
indicator flashes
slowly after firing.
The remote flash
unit emits 8 long
beeps.
Cause
All functions other than the
power switch are inoperable
because of power
abnormalities.
Underexposure may have
occurred.
Underexposure may have
occurred.
Pairing has failed.
The SB-5000 is attached to a
camera not compatible with
radio control.
Solution
Turn off the power,
remove the batteries,
and contact your
retailer or Nikon-
authorized service
representative.
Use a wider aperture
or move the flash unit
closer to the subject
and reshoot.
Use a wider aperture,
move the flash unit
closer to the subject
or change the position
of the flash unit and
reshoot.
Check the channel and
link mode setting and
try again.
Choose wireless
multiple flash-unit
photography using
optical control.
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C-4
C-10
C-14
C-17
D-45
D-47
D-12
D-5
H
H-4