Nissin Speedlite Di466 won't fire?

Question

I have a Nissan Speedlite Di466 flash gun. I use it on my Nikon D40. However, I'm having a problem where it's pot luck whether it will fire or not and when it does fire, the images are extremely underexposed and only 1 in 20 or so will be exposed properly when it does manage to fire. My camera is in TTL mode and the slave isn't turned on. I don't know what's the matter. I've had it for a while and as far as I remember it has always been like this. It's out of warranty though because I got it Christmas 2010.
I've also made sure that the flashgun has new batteries in it.
I usually use my camera in either Automatic or Program (mostly program though). I've read that sometimes flash guns won't work above or below a certain shutter speed but I'm not sure what that is for the flashgun I have. I've googled but to no avail.

Does anyone know what the problem might be?

Thank you in advance.

taguchi · Answer

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Nissin Speedlite Di466 won't fire?

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