420EX Speedlite : How to turn the Speedlite flash on and off.

Article ID: ART123284

Date published: 05/12/2015

Date last updated: 08/17/2015

How to turn the Speedlite flash on and off.

The main switch has the following settings

Turns off the power

Turns on the power

After 90 sec. of non-use, the SE (Save Energy) mode take effect automatically to turn off the 420EX and save battery power
To cancel the SE mode, press the test firing button

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