https://community.usa.canon.com/t5/Speedlite-Flashes/600ex-speedlite-won-t-sync/m-p/258238#M484 Hello all,<BR /><BR />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?<BR /><BR />Dave Sun, 04 Nov 2018 18:14:06 GMT daveburdick 2018-11-04T18:14:06Z https://community.usa.canon.com/t5/Speedlite-Flashes/600ex-speedlite-won-t-sync/m-p/258238#M484 Hello all,<BR /><BR />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?<BR /><BR />Dave Sun, 04 Nov 2018 18:14:06 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/600ex-speedlite-won-t-sync/m-p/258238#M484 daveburdick 2018-11-04T18:14:06Z https://community.usa.canon.com/t5/Speedlite-Flashes/600ex-speedlite-won-t-sync/m-p/258260#M485 600ex-rt, not 600ex-Ryan (thanks autocorrect!). Sun, 04 Nov 2018 23:22:54 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/600ex-speedlite-won-t-sync/m-p/258260#M485 daveburdick 2018-11-04T23:22:54Z https://community.usa.canon.com/t5/Speedlite-Flashes/600ex-speedlite-won-t-sync/m-p/258432#M486 <P>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.</P> Tue, 06 Nov 2018 17:49:08 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/600ex-speedlite-won-t-sync/m-p/258432#M486 PLee 2018-11-06T17:49:08Z