Intermittent AF540FGZ problem

Luiz Felipe luiz.felipe at
Wed Oct 7 17:46:28 EDT 2009

Charles, if you had problems and the repair is still in warranty you 
should get in touch with them. And use the flash a lot, to either get 
more data on the problem or be assured of its good condition.

Had my share of intermittent problems with computers and cameras, and 
hardly they go away on their own. Guess my luck is not that good with 
hardware... or gambling, wich I don't. ;-)


... assuming you're positive the problem lies in the flash... did you 
test with other TTL flash already?

Charles Robinson escreveu:
> I was trying to take pictures of my grandson a few days ago... and all 
> of my flash shots were turning out black.
> Taking my eye away from the camera, I could see that it was almost doing 
> what it did almost a year ago (which I paid to repair) - the pre-flash 
> was going off when it should... a very dim pre-flash.  And NO flash when 
> the actual exposure was being made.  (Original fault was a dim 
> pre-flash, which would make the camera think that the subject was very 
> dark, which meant that the final flash was usually full-power, regardless).
> The flash worked FINE if I would put it in "A" mode (where, sometimes, I 
> think I would just like it to stick - much more reliable in that 
> position.  I hate P-TTL).
> After some fiddling and changing the batteries out to be sure that 
> wasn't it (it wasn't) it started exposing OK again - but then the zoom 
> mechanism wasn't doing anything.  It would just blink the zoom position 
> on the rear display.
> Switching the zoom position to "manual" and cycling through the zoom 
> positions would have NO effect on the position of the zoom.  It would 
> blink the zoom positions, cycling through all of the zoom levels on the 
> back display, but I never heard the zoom motor going.
> No - it was not the diffuser/reflector pulled out on top - when you do 
> that it sticks in the "manual mode - 13mm" (when it's working).
> Disappointed... I found the receipt from my mid-November-2008 repair and 
> noted the 1-year warranty indicated on that sheet.  I popped the flash 
> into my camera/computer bag and brought it to work, prepared to ship it 
> back to Pentax.
> As I took it out of the bag at work, prepared to give them a detailed 
> write-up of what works and what doesn't.... it works perfectly.
> Now - since I have a month until the repair warranty runs out, I'd 
> really like to have it checked out.  But what do I tell them?  "It works 
> sometimes, but sometimes it does x,y,z"?  Basically I'm wondering what 
> is the most sure-fire way to ensure that the people at Pentax Colorado 
> (or wherever this flash ends up being repaired - sigh) take note of what 
> I tell 'em and really get it sorted out.. before I'm on the hook for 
> paying to repair it (again).
>  -Charles
> -- 
> Charles Robinson - charlesr at
> Minneapolis, MN
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Luiz Felipe
luiz.felipe at

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