Canon Speedlite 320EX - Manual (Page 43)

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If a problem occurs with the flash, first refer to this Troubleshooting
Guide. If this Troubleshooting Guide does not resolve the problem,
contact your dealer or nearest Canon Service Center.
Make sure that the batteries are installed in the correct orientation.
(p.8)
Insert the mounting foot into the camera’s hot shoe all the way,
slide the lock lever to the right, and secure the Speedlite to the
camera. (p.9)
If the flash recycling time takes 30 sec. or longer, replace the
batteries. (p.8)
If the electrical contacts of the Speedlite and camera are dirty,
clean the contacts. (p.4)
Auto power off took effect. Press the shutter button halfway. (p.10)
You were too close to the subject. Move away from the subject.
Remove the lens hood if attached.
If you took the picture with the flash head extended, the flash
coverage will be smaller. Retract the flash head to the normal
position and take the picture again. (p.19)
If there was a highly reflective object (glass window, etc.) in the
picture, use FE lock. (p.18)
If the subject looks very dark or very bright, set flash exposure
compensation. (p.27)
When high-speed sync is set, the effective flash range will be
shorter, so move closer to the subject. (p.28)
Troubleshooting Guide
The Speedlite does not fire.
The power turns off by itself.
The bottom of the picture looks dark.
The periphery of the picture is dark.
The flash exposure is underexposed or overexposed.
COP
Y