Question about Canon Speedlite 420EX TTL Flash

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Speedlite 420EX Suspect Main Flash not Firing

I have a 420EX that appears to not be firing the main flash. It will charge up and you can fire the pre-flash manually on the flash and also on my Rebel XTI. My camera will not remember the pre-flash, which is marked with an asterick that is seen in the view finder. All other functions seem to work on this flash, including range adjustments. Is there a pin on the hot-shoe where the flash will send information back to the camera? I'm wondering if this could possibly be the problem. Any help would be much appreciated. Thanks, Richard

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  • mike2089 Dec 25, 2007

    Hi I have the same problem with my 420, the flash light turns green after power on, and recycle, but within 5 seconds it turns red, the preflash works, as well as the rang info. But when I take the picture the flash does't fire.

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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  • 9 Answers

SOURCE: xti rebel 6 mths old - flash will not pop up

I found the answer and fixed my flash. Look on http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00ODWf

This will describe how, if you have been using a speedlite alot, than the little tab under the shutter release side of the hot shoe can get bent down thus constantly pressing down (toward the bottom of the camera) the small button which deactivates the pop-up flash even when the speedlite is not attached. Just bend the tab up a little with a jewler's screwdriver, turn the camera off and on and voila!! Fixed!!! Dan describes pushing the tab down, but on the xti, the tab needs to be bent up to release the flash deactivation switch and fix the problem. Thanks to Dan D on photonet for saving me a service call.

Posted on Feb 19, 2008

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  • 9 Answers

SOURCE: No flash popup on my rebel XTI

I found the answer and fixed my flash. Look on http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00ODWf

This will describe how, if you have been using a speedlite alot, than the little tab under the shutter release side of the hot shoe can get bent down thus constantly pressing down (toward the bottom of the camera) the small button which deactivates the pop-up1.gif flash even when the speedlite is not attached. Just bend the tab up a little with a jewler's screwdriver, turn the camera off and on and voila!! Fixed!!! Dan describes pushing the tab down, but on the xti, the tab needs to be bent up to release the flash deactivation switch and fix the problem. Thanks to Dan D on photonet for saving me a service call.

Posted on Feb 19, 2008

  • 23 Answers

SOURCE: flash not firing properly

Could be the metering mode you are in. Could be the subject is too far away. Could be ISO is set wrong. Could be the lens aperture can't open up enough. Could be the exposure compensation isn't set correctly. Could be FE Lock is still on and the composition has changed. Does the <flash> icon continue to blink? Then you are too far away.

Posted on Dec 06, 2008

  • 25 Answers

SOURCE: I have a canon rebel

I had the same problem.
Look closely at the hotshoe. Inside it, way over to the side, under one of the tabs on the side, is a tiny metal strip. When you attach an external flash, the strip is pushed down and holds down a tiny button that deactivated the pop-up flash. The strip can get bent so that it doesn't let the button come up even when the external flash is removed.
Very gently take a fingernail or a jeweler's screwdriver and run it underneath the metal strip. I had to do it a couple of times to get mine working again, but it's working great now!

Posted on Feb 18, 2009

  • 4 Answers

SOURCE: camera does not fire external flash

Also be certain that the flash is screwed onto the shoe as tightly as possible.

Posted on Feb 28, 2009

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How to Disassemble 420EX Flash


I wrote up on instructables how to disassemble this flash for anyone needing a guide.
http://www.instructables.com/id/How-to-Disassemble-a-Speedlite-420EX-Flash/

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If the flash fires but the photos are dark, this typically indicates a fault with one of the following:
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What you have to understand is that when you see one flash in operation, on a properly functioning unit there are actually two flashes in sequence. The first, pre-flash is used for metering the scene, then the follow up is the actual flash that gives the light in the photograph. If the transistor is faulty then it may just discharge the capacitor during the pre-flash, not leaving any energy left for the main flash. If the fiber optic cable is broken (it is very fragile), then the metering stage fails and the flash logic decides to abort the main flash.

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Does the pilot lamp light up? If so can you fire it manually by pressing on it? If the batteries are low it may simply just be taking a while to charge, the camera will not wait for it to be ready to fire and it may seem to be not working. If your flash can be fired manually however, there may be a problem with the cameras shutter or the hotshoe. You can do a basic check by pressing the star button at the rear of the camera, you should get a pre-flash. If not, there is a problem with the cameras hotshoe which you will need addressed by a service centre. If you get a preflash you can next check the cameras shutter by setting the second curtain to sync with the flash. This can be done via the cameras "Custom Function" menu, c-Fn 15. Set the camera to TV mode and chose a 1 second exposure. Take a shot with the flash attached, if the shutter is working correctly, the flash should fire a pre-flash and then a main flash. If it doesnt, the switch inside the shutter is broken and the shutter needs to be replaced. This is a pretty labour intensive repair and you may consider an upgrade as more economical.

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Canon flash speedlite 550 ex ttl


Send the flash back to canon for Service this is not something that can be fixed in this forum. Do not use the flash the burning smell indicated a potentially dangerous problem and fire hazard.

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The EOS 40D does not have a transmitter built in. The remote flash units must be set to "Slave" and the on-camera external flash unit (eg Speedlite 580EX) or transmitter (ST-E2) set to "Master". Note that the Speedlite 430EX doesn't have the function to act as Master and you need a minimum or the 580EX or a ST-E2 speedlite transmitter (or similar) as Master/s.

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I have exactly the same problem with my 580EX flash, can you let me know if you find a solution?

Thanks!

Joelle

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