Question about Sunpak Auto 555 TTL Flash

Sunpak 555 keeps flashing on it's own

I took out my 555, put fresh batteries in it, turned it on, let it charge up, connected it to a camera, started taking a few test flashes (by the trigger button, and then using the TTL synch cord, and after a few minutes it started triggering non-stop. I turned it off, waited a couple of minutes turned it back on, and it started doing it again. I've never used it with an A/C cord, only batteries, Any ideas what might be causing it or if it is cost effective to repair?

1 Answer

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216 Answers

Test button pins shorted to ground.

Could also be center pin shorted to ground.

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Posted on Jan 20, 2008

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