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01-24-2015, 08:43 PM   #1
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Pentax AF 540 flash not recycling

I have a Pentax AF 540 flash which stopped recycling this evening. The red "ready" light comes on briefly when I turn the flash on, but I cannot get it to fire. The flash has probably been used for 400-500 photos. Does this mean it's dead? I'm hoping that I'm overlooking something silly and there's an easy fix.

01-24-2015, 09:16 PM   #2
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QuoteOriginally posted by mcrogner Quote
I have a Pentax AF 540 flash which stopped recycling this evening. The red "ready" light comes on briefly when I turn the flash on, but I cannot get it to fire. The flash has probably been used for 400-500 photos. Does this mean it's dead? I'm hoping that I'm overlooking something silly and there's an easy fix.
Have you tried the test button?
01-24-2015, 09:32 PM   #3
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Did you try new batteries? My 360 becomes a real pain on low battery.
01-24-2015, 09:37 PM   #4
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It's a shot in the dark (yes, pun intended), but doesn't hurt to try.

Set the charging mode to PP2 ("Switching the Charging Mode"):



Please report back.

01-24-2015, 09:48 PM   #5
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Thanks all!

I let it rest for about 10 minutes and then it began working again. No idea, as I hadn't fired it more than twice tonight before it stopped working. Hopefully isn't a long term issue, but seems to be fixed for now.
01-25-2015, 01:54 AM   #6
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Eneloops seem to work well, since they hold a constant voltage until just before they're completely discharged. Many electronics respond better to this than a gradually sinking voltage. I'd certainly test your battery voltage to see where they're at.
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