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Cameras, Lenses and Accessories: Discuss Yongnuo RF-602 wireless trigger Troubleshooting...Hi all I have just bought the above wireless trigger set to use in conjunction with my Canon 430exII Only ...
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Old 13-03-2012, 14:23   #1 (permalink)
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Yongnuo RF-602 wireless trigger Troubleshooting

Hi all

I have just bought the above wireless trigger set to use in conjunction with my Canon 430exII

Only problem is I cant get the flash to fire using these.

Both RX and TX are on the same channel
Lights on both are as they should be so I dont suspect a problem with the batteries

Does anybody use the same setup and could offer some suggestions to try? I have the flash set to manual mode. Any other settings on flash and camera that I should consider? I am using a canon 550D

All suggestions appreciated.

Thanks
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Old 13-03-2012, 14:59   #2 (permalink)
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Re: Yongnuo RF-602 wireless trigger Troubleshooting

Don't use any of the three but I will suggest a possibility as happened to me and the Canon G11 (with strobes and PT04s). It needed to be set to Single Shot AF (or MF) rather than my permanent setting of Continuous AF! No idea why!
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Old 13-03-2012, 16:29   #3 (permalink)
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Re: Yongnuo RF-602 wireless trigger Troubleshooting

If you trigger the Tx manually does the Rx light come on to indicate the unit has received a signal? You don't have to have the flash attached to check this. If it does, the issue must be in the settings somewhere.

Is the flash set on manual?
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Old 13-03-2012, 19:35   #4 (permalink)
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Re: Yongnuo RF-602 wireless trigger Troubleshooting

Hi everyone,

Thanks for all your replies.

I recently purchased the set on ebay. Set includeds 1 x transmitter (tx) and 2 x Receivers (rx)
When the set arrived I tested it with a £2.50 flash purchased off ebay. Not sure of the voltage, but suspect its probably on the high end. When I tested it, the lights on the rx and tx lights up as they should to indicate a signal has been received by the receiver - though the flash never fired.

So......I decided to buy a decent flash (and one which I know is compatible with these triggers), namely canon 430exII. When this arrived, I set it up promptly using the same tx and rx as I used for the first older type flash I bought. Again......I had no joy firing the flash though the lights on the rx and tx are working as they should.

So then, I just had an idea to try the extra receiver received as part of the set, which is still boxed and unused. When I connect this one up, the flash fires pefectly and there are no problems at all......hmmmm??

So the problem seems to be with the first transmitter. Did I 'fry' its circuitry or something when using this older flash??? though the lights work as described above, so I would have thought that these would'nt work either if I'd 'fried' the receiver real good.

Has anybody experienced or come across something similiar?

Thanks for reading
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Old 13-03-2012, 19:46   #5 (permalink)
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Re: Yongnuo RF-602 wireless trigger Troubleshooting

I'd guess that the flash probably fried it - older flashes have (relatively) high trigger voltages
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Old 13-03-2012, 20:00   #6 (permalink)
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Re: Yongnuo RF-602 wireless trigger Troubleshooting

certainly sounds like it could be fried however if the lights are still coming on i dont see why. I use the same triggers successfully on both canon and nikon speedlights as well as studio lights with no problem,
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Old 13-03-2012, 20:14   #7 (permalink)
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Re: Yongnuo RF-602 wireless trigger Troubleshooting

I suppose that if the radio receiver is still working it will light up the indicator light, but the firing circuit might be toast. If the other unit is working OK it does suggest that the first one is damaged. I've never heard of one of these units failing or not working.

If you have a multimeter you could see if there is a voltage across the firing pins.
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Old 17-03-2012, 23:56   #8 (permalink)
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Re: Yongnuo RF-602 wireless trigger Troubleshooting

Following on from another thread, Markulous suggested looking at some remarks on Flickr.

Flickr: Discussing RF-602 RX Flash Trigger Voltage Mod in Strobist.com

There I found some useful tips on repairing or at least preventing failure from damaging these units with older flash guns. As the circuit on the 602 seems very similar to the circuit on my remote unit I would hazard a fairly certain guess that the output to the hotshoe is fried. These units use 2 circuits as far as I can make out, one to the hot shoe and one to the PC connector - on my remote this is supplied as a separate connector for studio flashes. This should take the higher voltage. If you can fire the Canon flash with a cable from a PC connector, then this should work from both of your receivers proving that the output to the hotshoe is indeed fried on the first one.

To be technical, the output to the hotshoe pin is fired by a MOSFET that will only tolerate low voltages from the flashgun before frying the output. In my case, measuring the signal to the input of this MOSFET showed that everything was working up to the MOSFET, i.e. signal received and passed as far as the MOSFET, so the unit looks as if it is OK but just does not fire the flash. The thread on Flickr shows replacing the MOSFET with one of a higher rated transistor/MOSFET/SCR. I have not tried this yet but given the discussion and my own findings I am pretty confident a substitute transistor/scr will work and allow the older flash to be fired from the hotshoe on the trigger. However, soldering 'surface mount' electronics needs care and a very fine, temperature controlled soldering iron.
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