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The ON/OFF button is, of course, used to turn the flash on and off, but it also serves several additional functions:
• To bring the flash out of Standby mode, push the ON/OFF button, and the flash will wake up.
• To exit from Custom Settings menus, push the ON/OFF button to return to the regular screen.
• To perform a system reset, push the MODE and ON/OFF buttons together for two seconds, and you will reset the flash (including the custom settings) to the factory default settings.
Be sure to turn the flash off before you attach or remove it from the camera body. This prevents any short circuits as well as preventing the flash from firing. If you forget to turn the flash off before putting it back into the camera case, it automatically goes into Standby mode and stops consuming battery power (figure 4.13).