600ex speedlite won’t sync

[daveburdick]

Hello all,

I’m running into an issue where my 600ex-Ryan v1 speedlite won’t wirelessly sync, via optical or radio, the link light just stays red. I’ve tried using my ST-E3-RT transmitter to link optically, which works for my other 600ex-Ryan speedlites, but this specific one won’t work. Any ideas, or should I just write this one off as broken?

Dave

[daveburdick]

600ex-rt, not 600ex-Ryan (thanks autocorrect!).

[PLee · Accepted solution]

Just make sure that the channel and ID settings for both the ST-E3-RT and 600EX match. Also check that the flash is in radio wireless mode with an amber colored screen.