Canon 550EX - Manual (Page 106)

Wireless Flash Range
Check that the master unit’s pilot
lamp is lit and that the slave unit(s)
are recharged and ready.
• When a slave unit is ready, its AF-assist
beam blinks once per second.
Press the master unit’s pilot lamp
(test firing button) to fire a test flash.
• When the wireless transmission works, the
slave unit fires at the flash output that was
set.
• If a slave unit does not fire, place it closer to
the master unit or angle the sensor more
toward the master unit and try again.
In a wireless flash system, all the settings can be set with the master unit. The master
unit transmits all these settings to the slave units by wireless signals. Controlling slave
unit(s) is the same as controlling one on-camera Speedlite.
Make sure the slave units are within the effective range of the master unit.
After the picture is taken, the slave unit’s operation result is displayed on the LCD
panel
With the slave unit's main switch set to SE (Save Energy), the slave unit turns off
automatically if it is left unused tor over 60 minutes*. While the slave unit is off due to
this SE mode, SE is displayed on the LCD panel. Within 1 hour** after the slave unit
turns off in the SE mode, the slave unit can be turned on again by pressing the master
unit's test firing button.
If the manual flash mode has been set and you press the master unit’s pilot lamp, all
the slave units will fire a test flash simultaneously at the manually-set flash output.
After pressing the shutter button halfway, test firing cannot be executed during the first
6 sec. when the camera is metering the scene.
Custom Function CF-4 can change this to 10 minutes See page 113
Custom Function CF-5 can change this to 8 hours. See page 113
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