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09-25-2018, 11:11 AM   #1
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Dreaded ABF

My K30 is starting to show the dredged aperture block failure on all but the PLM lens, showing dark frames for the first few shots then working ok with my DA 18-135. Will have to see how long it lasts before I have to fix it or replace it.

09-25-2018, 11:15 AM   #2
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My daughter is still using my K-30 Black Knight with the ABF with the AA adapter after a year's failure.
09-25-2018, 11:31 AM   #3
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I have the AA adapter, I have read it could be a temp fix, I will have to try it.
09-28-2018, 03:55 AM   #4
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Get the white solenoid and repair it proberly. You don't want to be stuck during an important photo-session.

It is easy and worth it.

09-29-2018, 08:57 AM   #5
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Anyone found a good source for the White Solenoid, just lost a bit on an old body, ebay seems to only have the green sol.
09-29-2018, 08:28 PM   #6
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Pentax K-30 K-50 K-S1/S2 K-500 Genuine Aperture Solenoid Plunger Part - Japan - | eBay
10-03-2018, 06:14 PM   #7
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^ They have already sold about 150 of them. I think that's just a tip of the iceberg. There are probably many other people that would get one if they knew about this and/or would be willing to do the fix themselves.

Goes to show that someone at Hoya/Ricoh/Pentax really screwed up the K-30/50, K-S1/S2, & now possibly the K-70 too.
10-05-2018, 08:35 AM   #8
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The annoying thing was they didn't replace the faulty solenoid after the K-30 and continued using it in the K-50, K-500, K-S1 and K-S2, had probably already bought a load of them in bulk.

The failure rate must be way above average now.

Going to attempt fixing my K-50 at the weekend so wish me good luck!

---------- Post added 10-05-18 at 08:39 AM ----------

QuoteOriginally posted by The Squirrel Mafia Quote
^ They have already sold about 150 of them. I think that's just a tip of the iceberg. There are probably many other people that would get one if they knew about this and/or would be willing to do the fix themselves.

Goes to show that someone at Hoya/Ricoh/Pentax really screwed up the K-30/50, K-S1/S2, & now possibly the K-70 too.
People should be aware that some of the old Pentax DSLRs with the white solenoid being sold as "faulty, for parts only" on ebay have already had the solenoids removed.

10-05-2018, 08:54 AM   #9
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Or you buy the entire diaphragm control block replacement part from USCamera which apparently now has a white solenoid for $35 plus shipping.
10-05-2018, 09:01 AM   #10
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QuoteOriginally posted by Tangent88 Quote
The annoying thing was they didn't replace the faulty solenoid after the K-30 and continued using it in the K-50, K-500, K-S1 and K-S2, had probably already bought a load of them in bulk.

The failure rate must be way above average now.
My K-30 starting Dark Image Syndrome symptoms three years after I purchased it. We don't know how long it took Pentax to realize they had a problem and what that problem consisted of.
10-05-2018, 09:12 AM   #11
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QuoteOriginally posted by Tangent88 Quote
Going to attempt fixing my K-50 at the weekend so wish me good luck!
It's really not that hard. Just takes time to do it, since everything is sooooooo tiny. It took me about 3 hours just fumbling around with the whole thing. Even cost me a slightly burned finger. Hahaha! My camera has almost 20,000 trouble free shots since August of 2017. Mind you that my soldering skills are next to none & I would consider the soldering job that I did in my K-50 to be well below average. It was kind of sloppy. I used a Harbor Freight soldering tool.

I would do a lot better if I had to do it again on my red K-50, but I would rather not do it if possible. Hopefully that one doesn't fail............
10-05-2018, 10:30 AM   #12
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QuoteOriginally posted by Not a Number Quote
Or you buy the entire diaphragm control block replacement part from USCamera which apparently now has a white solenoid for $35 plus shipping.
Is anything known about this part?

Color of plastic does not, of and by itself, guarantee that this part works well.
I'd be surprised if any "new" versions exist of the part that was used to assemble cameras before the K-30.

Is it the one being put into the K-70?
10-05-2018, 10:38 AM   #13
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QuoteOriginally posted by reh321 Quote
Is anything known about this part?
Pentax K-S2 K30 K50 Diaphragm Control Block. USCamera Pentax PartsUSCamera

^ Looks like it contains the same "green" solenoid?
10-06-2018, 04:06 AM   #14
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QuoteOriginally posted by The Squirrel Mafia Quote
It's really not that hard. Just takes time to do it, since everything is sooooooo tiny. It took me about 3 hours just fumbling around with the whole thing. Even cost me a slightly burned finger. Hahaha! My camera has almost 20,000 trouble free shots since August of 2017. Mind you that my soldering skills are next to none & I would consider the soldering job that I did in my K-50 to be well below average. It was kind of sloppy. I used a Harbor Freight soldering tool.

I would do a lot better if I had to do it again on my red K-50, but I would rather not do it if possible. Hopefully that one doesn't fail............
I've got someone who's done a bit of soldering to help but he hasn't worked on anything this small.

Going to follow madphys' guide off here and also the video below which is great for identifying where all the screws are (though not going to do the filling part).

10-06-2018, 06:13 AM   #15
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QuoteOriginally posted by Not a Number Quote
Or you buy the entire diaphragm control block replacement part from USCamera which apparently now has a white solenoid for $35 plus shipping.
The thing is, a replacement part with "white" plastic is questionable until something is known about its 'provenance':

* was it taken from an old camera?

* is it a part from ten years ago that has managed to remain unsold until now?

* did someone research and recreate the old formula for metals and plastics in the part?

* did someone replace the 'green' PET with 'white' PTFE?

* did someone replace the 'green' PET with 'white' PET?

Hopefully its goal of producing only "Premium" cameras will cause Pentax to stop using this part, and the whole question will become moot in another few years.
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