Godox TT685II-N User Manual page 23

Check the communication channel.
If the Transmitter unit Receiver unit(s) are set to a different channel, set them to
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the same channel.
Position the camera and flashes
Position the camera and flashes as the picture shows
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Check that the flash is ready
Check that the Transmitter flash ready indicator is lightened.
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Check the flash operation.
Press the Transmitter unit's Test Button < >
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Then, the Receiver unit will fire. If not, adjust the Receiver unit's angle toward the
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Transmitter unit and distance from the Transmitter unit.
Using Automatic Wireless Flash with Multiple Receiver Units
When stronger flash output or more convenient lighting operation is needed, increase
the number of Receiver units and set it as a single Receiver unit. To add Receiver units,
use the same steps as setting "automatic wireless flash with a single Receiver unit". Any
flash group can be set (A/B/C/D/E). When the number of Receiver units is increased, and
the Transmitter unit flash firing is ON, automatic control is implemented to make all
groups of flashes fire the same flash output and ensure the total flash output up is to
standard exposure.
If the Receiver unit's auto power off function is workable, press the Transmitter
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unit's test button to power it on. Please note that test firing is unavailable during
the camera's regular metering time.
The effective time of Receiver auto power off is changeable.
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By making some settings, the auto AF-assist transmitter will not blink after the
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Receiver unit's flash ready indicator is lightened.
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