Intermittent AF540FGZ problem

paul stenquist pnstenquist at
Wed Oct 7 18:01:27 EDT 2009

On Oct 7, 2009, at 5:31 PM, Doug Franklin wrote:

> Charles Robinson wrote:
>> 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).
> It sounds like one or more loose electrical connections somewhere.   
> Did you try cleaning the contacts in the hot shoe and on the flash?   
> If not, do so.  If so, I guess it depends on how adventurous you are  
> and how easy the flash is to get open.
> If it's not the shoe contacts, my first suspect would be the wires/ 
> connections that lead from the contacts in the foot up to the  
> circuit board.  Those should be easy to fix on the foot end, but  
> likely not on the circuit board end (likely to be a flexible circuit  
> board that would probably be damaged by normal soldering with a  
> typical iron).

There's a plug in between the foot and the leads to the circuit board.  
However, I think a failure there would be unlikely.

> If it's neither of those, it might well be a cracked trace or weak  
> solder joint on the circuit board, which you can't fix yourself  
> (unless you have a circuit board to swap in).
> It doesn't sound like the wiring from the circuit board to the non- 
> camera components, like the tube.
> -- 
> Thanks,
> DougF (KG4LMZ)
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