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Forum: Pentax K-30 & K-50
05-21-2019, 08:30 AM
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My K-50 recently started to produce the occasional dark (fully stopped down) image. It gradually got worse so I swapped the K-50 solenoid for one from the flash pop-up in an *ist DL2.
Sadly it didn't fix the problem for long. Also, the suspect solenoid from the K-50 works fine in the *ist DL2.
I think the fundamental problem (at least with my K-50) is with one of the two torsion springs in the aperture control block. I've not taken the block apart yet (I'm waiting to obtain an offset screwdriver) but I suspect the spring has unclipped or has become too weak to pull the plunger out of the solenoid. If it's the later I will try making a slightly stronger spring.
A weak spring would probably explain why the mechanism is so sensitive to slight variations in voltage and differences in solenoid extraction force.
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