Hey, I have the original Pentax K5. I had the Yongnuo 560 IV speedlight for a while. Just picked up a set of the RF 603N II today.
I put fresh batteries (Eneloops) into the speedlight, and new batteries as well for both of the triggers.
I set both of the triggers to channel 1. I took one of the triggers, set it to TX mode and put it on the hot shoe of my camera.
I took the other trigger, also on channel 1, put in TRX mode and put it on the speedlight.
Speedlight is in RX mode on channel 1, group A. Advanced settings have also been adjusted so that it is supporting the RF603.
The triggers do light up when I press the buttons on them but don't do anything else, I don't see a blue LED light on the speedlight.
I've Googled for about an hour but I couldn't find a solution. It just won't fire.
EDIT: Works now. Issue was with the camera. The shutter speed was past the maximum sync speed (1/180). Just stopped down a bit and works fine now. Keeping this thread here in the future when someone might have the same issue.
Last edited by matt_lin18; 08-14-2015 at 03:41 PM.