Canon Speedlite 580EX II - Manual (Page 51)

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If there is a problem, refer to this Troubleshooting Guide.
The batteries are installed in the wrong orientation.
X Install the batteries in the correct orientation. (p.8)
The Speedlite’s internal batteries are exhausted.
X If the flash recycling time takes 30 sec. or longer, replace the
batteries. (p.8)
X Install the Speedlite’s internal batteries even when you use an
external power source. (p.8)
The Speedlite is not attached securely to the camera.
X Attach the Speedlite’s mounting foot securely to the camera. (p.9)
The electrical contacts of the Speedlite and camera are dirty.
X Clean the contacts. (p.9)
The slave’s wireless mode is not set to <x>.
X Set it to <x>. (p.36)
The slave unit(s) is not positioned properly.
X Place the slave unit within the master unit’s transmission range.
(p.38)
X Point the slave unit(s)’s sensor toward the master unit. (p.38)
Auto power off took effect.
X Press the shutter button halfway or press the test firing button.
(p.10)
The wide panel has been pulled out for bounce flash.
X Retract the wide panel. (p.20)
Troubleshooting Guide
The Speedlite does not fire.
The slave unit does not fire.
The power turns off by itself.
The entire LCD panel blinks.
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