Nikon 4804 R1 Wireless Close-Up Speedlight System - Manual (Page 129)

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Ready-light warning inside the camera’s viewfinder
A note on microcomputer-controlled Speedlights
The Speedlight incorporates a microcomputer to control flash operations. In rare
cases, the Speedlight may not work properly even after a fresh battery is
properly installed. If this happens, replace the battery while the Speedlight’s
power is turned on.
Problem Solution
The ready-light inside camera’s viewfinder
blinks when the SU-800 is mounted on
cameras not compatible with CLS and the
flash mode is set to TTL in close-up flash
operation (using cords). Set the flash mode to M (manual).
Warning
• Batteries should not be exposed to excessive heat such as strong sunshine, fire, etc.
• Dry batteries should never be recharged in a battery charger.
• Do not expose the Speedlight to water as this may result in electric shock or cause the
unit to catch on fire.