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iainglasgow · Joined: 21 Nov 2007 Posts: 167 Location: Scotland

I have a problem with a flash trigger and was wondering if anyone has experienced similar.

The model is Yongnuo CTR-301P

I haven't used it for some time and have discovered today that the radio trigger setting isn't working.

It works fine if I use the flash-trigger setting, either with the built in flash or a speedlite in the hotshoe.

Was just wondering if anyone had experienced a similar problem (with this or a similar model) or knows if it is likely to be the transmitter or receiver that is at fault. It certainly hasn't been battered, dropped or damaged in any way.

As I say its a while since I've used it but as I recall it was just a case of plugging the transmitter into the hotshoe (and making sure the receiver was set correctly) to trigger it. I've tried it on both TTL and manual flash modes but makes no difference.

iainglasgow · Joined: 21 Nov 2007 Posts: 167 Location: Scotland

Well problem solved. Turns out to be the battery in the transmitter (which I'd assumed didn't have one and was powered by the hotshoe - my bad lol).

Tested the (12v) battery with a multimeter and there's only 0.7v coming from it. The battery in the receiver which has never been replaced (and used more in light triggering mode) still has just over the full 3v in it. I suppose the transmitter uses alot more power though.

mauijon · Joined: 02 Mar 2005 Posts: 4279 Location: Maui, Hawaii

If it is like mine, the transmitter does not have an OFF switch, but the receivers do. So the transmitter has some (very little) current flow all the time.