Question about Sigma EF-500 DG for TTL Flash

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Sigma EF-500 DG super

The flash stopped working. When I turn it on with new batteries it gets stuck on TTL ZOOM 28mm blinking on the screen. The pilot light does not turn on and not a single one of the buttons makes any diference. I can't even turn it off. After switching to off it keeos blinking the zoom 28mm on the screen.
The only way to turn it off is by removing the batteries.
This summer I travel overseas with the flash unit in the suitcase and batteries in it. Could that have affected it?
My local precision camera store did not have any insight and I am getting ready to ship it to Sigma but I wanted to try you guys first.

Thanks for any help you can send my way.
Sincerely
Maria

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The Sigma EF-500 flashes have very small chromed contacts for the batteries. Even though they may not look corroded, they may not power up or conduct enough power to fully cycle up. Use a polishing tip in a dremel or an ink eraser tip to clean the internal wire contacts and the flat contacts on the door. I use dielectric grease on a q-tip to apply a coat to all contacts and cleaned battery terminals to minimise future issues.

Posted on Dec 10, 2008

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