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05-24-2016, 06:01 AM - 3 Likes   #1
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K-30 / K-50 Aperture Block Failue - Repair Solution available

Hi together,

our colleages from the russian Pentax forum have worked on the aperture block failure problem and semm to have found an explanation for the cause of the failure and have documented the repair. Only problem: I don't speak Russian and google translator is not much better. So we need a russian speaker or somebody wth a better translation software to understand the details of the repair approach. Here is the link to the repair documentation. Goggle translator at least gives a rough idea.

In Russian:
???????? ? ?30! - ?????? ?????-????? - ???????? 7

Anybody able to carry on from this point?


Bob

05-24-2016, 08:25 AM   #2
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I can't translate it but it looks like it actually worked with a few people. The repair looks scary though.
05-24-2016, 10:16 AM - 1 Like   #3
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As far as I understood, the cause of the failure is an electromagnetic actuator that develops a resident magnetism and starts to stick. Since the google-translation is somewhat creative I didn't really understand what in this long thread was just speculation or a test, and what is part of the repair solution.

My own K-30 ist still working, but I hate to take a camera system to important shooting situations, when the camera body is likely to fail. Hopefully the russian documentation of the research and repair solution will sooner or later lead to a permanent and cheap remedy. Mabe the Russians have offered what Pentax is declining their customers.

The untrustworthy way Pentax is coping with their K-30/50 serial error has cost them my sympathy and I don't have any special preference for Pentax products any more. For the moment I won't invest any more money in Pentax lenses and have an occasional look around.

Bob
05-24-2016, 01:29 PM - 1 Like   #4
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QuoteOriginally posted by Altglas Quote
As far as I understood, the cause of the failure is an electromagnetic actuator that develops a resident magnetism and starts to stick. Since the google-translation is somewhat creative I didn't really understand what in this long thread was just speculation or a test, and what is part of the repair solution.

My own K-30 ist still working, but I hate to take a camera system to important shooting situations, when the camera body is likely to fail. Hopefully the russian documentation of the research and repair solution will sooner or later lead to a permanent and cheap remedy. Mabe the Russians have offered what Pentax is declining their customers.

The untrustworthy way Pentax is coping with their K-30/50 serial error has cost them my sympathy and I don't have any special preference for Pentax products any more. For the moment I won't invest any more money in Pentax lenses and have an occasional look around.

Bob
I hope Pentax will hear Altglas complaint. It is so true.

05-24-2016, 01:40 PM   #5
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K-30 aperture block problem

Can anybody translate the yellow Russian words in the photo? I think they explain what to do to the piece in order to solve the problem. Thanks.
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05-24-2016, 03:39 PM   #6
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I think the photo just indicates the actuator that is the problem. Reading through the thread, it sounds like the fixes tried were to clean, file, polish, or shim the armature of the solenoid ("el.magnit") so that it does not stick.

The following is according to my reading of the font in the picture, and Google's interpretation of the words

Left arrow:
В это разъём аккуратно нужно вставить лезвие и чуть провернувь, чтобы эл.магнит соскочил со штифта.
In this connector gently to insert the blade and just having turned to el.magnit jumped off the pin .

Right arrow:
Собственно вот она, наша цель (винт уже откручен)
Actually, it 's our goal (screw unscrewed already )


These are the critical steps of the process (still in Googlish, sorry) (Google may be inaccurate, but I totally agree with the warnings in the thread about what appears to be their term for the flash capacitor: "the beast that bites")

8. gently with a scalpel ( in my case a small vegetable knife with a thin blade ) magnet separated from the body , except the screw holding it on the pin even at the expense of lacquer .
9. The magnet holding hands , tweezers pulled anchor
10. in the absence of the grip , just holding needle file on the table and hold down two fingers to anchor a couple of times they spent on needle files to bring down the "mirror" at the ends
11. nulevku walked around the edges of the ends of the armature to remove burrs
12. " pomusolit " in the hands of the anchor in order to remove chips that could primagnititsya him
13. Anchor tweezers dipped into gasoline waited until dry , and put in place
14. el.magnit screwed into place and " planted " on the drop of varnish on the pin and screw
15. neatly arrayed on the front of the body lens mount , and checked that AF.S / C / MF switch on his seat simply by moving it through all of the provisions , if the switches to all three , then hit ( I missed on the first try , and did not immediately notice I had to re- assort )

Basically, I think they are removing the actuator, then removing the steel/iron armature ("anchor") from the solenoid and polishing it with a needle file (or very fine-grit sandpaper - there is some discussion of sandpaper in the thread), cleaning any filings, then reassembling it.
05-25-2016, 01:06 AM   #7
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I had the impression, that they talked about parts becoming permanently magnetic and sticking to their counterpart. Somewhere I remeber to have read that they changed the shape of the contacting parts so that the residing magnetism would not be able to make the parts stick together. If nobody here is able to improve the google translation, we might try to contact the russian researchers and ask for help. Though I can't read their language, it is clear that they did a great job. They not only repaired their camera and went on with their other projects, they took the time to document the solution. I think I should thank them since this has been really nice of them.
05-25-2016, 11:41 AM   #8
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QuoteOriginally posted by Altglas Quote
I had the impression, that they talked about parts becoming permanently magnetic and sticking to their counterpart. Somewhere I remeber to have read that they changed the shape of the contacting parts so that the residing magnetism would not be able to make the parts stick together. If nobody here is able to improve the google translation, we might try to contact the russian researchers and ask for help. Though I can't read their language, it is clear that they did a great job. They not only repaired their camera and went on with their other projects, they took the time to document the solution. I think I should thank them since this has been really nice of them.
I tried to post on their forum to ask for more details but you have to be logged in....

---------- Post added 05-25-16 at 11:46 AM ----------

QuoteOriginally posted by JoseFF Quote
I tried to post on their forum to ask for more details but you have to be logged in....
I am sure those guys speak, at least some English. By the way, thank you all for your responses

05-25-2016, 04:17 PM   #9
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QuoteOriginally posted by Altglas Quote
Hi together,

our colleages from the russian Pentax forum have worked on the aperture block failure problem and semm to have found an explanation for the cause of the failure and have documented the repair. Only problem: I don't speak Russian and google translator is not much better. So we need a russian speaker or somebody wth a better translation software to understand the details of the repair approach. Here is the link to the repair documentation. Goggle translator at least gives a rough idea.

In Russian:
???????? ? ?30! - ?????? ?????-????? - ???????? 7

Anybody able to carry on from this point?


Bob
nice find
05-25-2016, 04:27 PM   #10
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QuoteOriginally posted by Altglas Quote
The untrustworthy way Pentax is coping with their K-30/50 serial error has cost them my sympathy...
UntrustworthY? You mean accepting and fixing the cameras under warranty? I was unaware of warranty service problems in Europe. If your camera is out-of-warranty and believe you will be better served with foreign language instructions on a home-brewed repair, be my guest. Given the cost to replace with a new camera vs. cost to repair you have little to lose.

FWIW, the warranty repair involves replacement of the actuator assembly and controller component.


Steve
05-25-2016, 05:24 PM   #11
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QuoteOriginally posted by stevebrot Quote
UntrustworthY? You mean accepting and fixing the cameras under warranty? I was unaware of warranty service problems in Europe. If your camera is out-of-warranty and believe you will be better served with foreign language instructions on a home-brewed repair, be my guest. Given the cost to replace with a new camera vs. cost to repair you have little to lose.

FWIW, the warranty repair involves replacement of the actuator assembly and controller component.


Steve
But if they are replaced by parts with the same level of quality than originals likely to fail too, I wonder if the deal is worthwhile...
05-25-2016, 05:29 PM   #12
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QuoteOriginally posted by JoseFF Quote
But if they are replaced by parts with the same level of quality than originals likely to fail too, I wonder if the deal is worthwhile...
I went through the warranty repair process here in the U.S. with a friend Jan 2015 (K-50 purchased Jan 2014) and her camera is still doing fine. If one's camera is still under warranty, the deal is worthwhile (free is a very good price).


Steve

Last edited by stevebrot; 05-25-2016 at 06:25 PM.
05-25-2016, 06:25 PM   #13
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QuoteOriginally posted by THoog Quote
Basically, I think they are removing the actuator, then removing the steel/iron armature ("anchor") from the solenoid and polishing it with a needle file (or very fine-grit sandpaper - there is some discussion of sandpaper in the thread), cleaning any filings, then reassembling it.
Do you think they were trying to remedy some sort of mechanical binding of the solenoid?


Steve
05-25-2016, 08:23 PM   #14
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QuoteOriginally posted by stevebrot Quote
I went through the warranty repair process here in the U.S. with a friend Jan 2015 (K-50 purchased Jan 2014) and her camera is still doing fine. If one's camera is still under warranty, the deal is worthwhile (free is a very good price).


Steve
What I donīt buy is the high level of uncertainty of the replacement part procedure without knowing whether they are revisions that supersede its high % of early failure. But anyway, this is only my opinion...
05-25-2016, 09:25 PM   #15
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QuoteOriginally posted by stevebrot Quote
Do you think they were trying to remedy some sort of mechanical binding of the solenoid?

Steve
It sounds like it. They go through various discussions of causes, then there is some back-and-forth whether (filing?) the armature will affect the strength of the actuator. The term "air gap" comes up a few times. There is even a brief discussion whether the (better-quality?) actuator from a K-m would work. I think this photo will yield more information, but it will take at least a couple hours to copy and translate the text.

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