AF-assist illuminator does not work

AF-assist illuminator does not work

Yongnuo YN-622C 622C YN622 YN 1/8000 E-TTL Flash Trigger Flash Trigger Trigger for Canon Camera (Accessories)

Customer Review

Both function as specified. The only exception in which a trigger does not work, the AF assist lamp.
Before I would send it back to know whether perhaps a combination of keys on the auxiliary light trigger
Enable / Disable can. If it so that is the auxiliary light is turned off and it can be turned on
am I to forgive also prepared 5 Stars. Does anyone know the solution, or is it actually a hardware failures?

Edit: I have a part to the factory settings. Hold Set buttons simultaneously for several seconds Group and Channel
until the LEDs go out. After that everything worked perfectly incl. Illuminator. Have therefore my rating raised to deserve 5 stars.

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