Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-14-2019, 05:56 AM   #121
Pentaxian
rogerstg's Avatar

Join Date: Oct 2007
Location: Rhode Island
Photos: Albums
Posts: 603
QuoteOriginally posted by reh321 Quote
Sitting on the shelf for a year is deadly for it.
QuoteOriginally posted by okieman46 Quote
Had to have my K-S2 Aperture Control block replaced as well. The camera was new, but had set in the box for a year or so and not been used when the problem occurred.
I hope that's not the case, but if it is, I suspect Pentax will be repairing all the old stock being sold on special now. I recently bought one for my wife, which according to the metadata tool, was manufactured on March 22, 2017. That's more than two years sitting unused.

So far so good after only about a hundred shots.

06-15-2019, 08:41 AM - 1 Like   #122
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,096
QuoteOriginally posted by rogerstg Quote
I hope that's not the case, but if it is, I suspect Pentax will be repairing all the old stock being sold on special now. I recently bought one for my wife, which according to the metadata tool, was manufactured on March 22, 2017. That's more than two years sitting unused.

So far so good after only about a hundred shots.
'We' do not understand the process of one of these cameras failing. Anecdotally, many stories of failure begin something like "I took my K-50 off the shelf where it had sat for six months to take photos of my child's First Communion and the photos were all dark". I was trying to encapsulate that sort of thought.

On the other hand, I purchased my K-30 from KEH at a time when I had never heard of the Dark Image Syndrome. My camera had a shutter count of 3 when I got it; I used it for about three years on AA batteries before it started failing. I am sure that a New In Box K-S2 purchased in June 2018 will be no more failure prone than it would have been when purchased the day after it was produced, but I would make a point of using it regularly after that.
06-15-2019, 10:57 AM   #123
Pentaxian
rogerstg's Avatar

Join Date: Oct 2007
Location: Rhode Island
Photos: Albums
Posts: 603
QuoteOriginally posted by reh321 Quote
'We' do not understand the process of one of these cameras failing
Thanks for encouraging words, and I should have used some emoticons since I didn't mean to indicate that I was worried. I understand that the helpful comments are the result of anecdotal evidence and worthwhile within that context.
06-16-2019, 03:41 AM   #124
Pentaxian




Join Date: Aug 2013
Location: Iloilo City
Photos: Gallery
Posts: 1,875
Actually it scared me off buying one last week. Like I said, the k-s2 has a very good feedback except for this problem. The errors on the d5300 as far as I've read is I think even worse. It can't focus properly.

06-16-2019, 09:06 AM - 1 Like   #125
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,096
A thread in the K-70 area is very relevant here.
Solenoid in Pentax K-70 - PentaxForums.com

Member @photogem; compared the solenoid used in the K-30/50 with the one used in the K-70 {and presumably in the K-S2}
The following summarizes his conclusions
QuoteOriginally posted by photogem:
To me it is very clear, Ricoh did demand a modification of the plunger. The modification worked because very few K-S1 and K-S2 failed, we don't know yet about the K-70 but I am positive that we will have only very few failures.

And yet, some did fail. So a very precise modification to the plunger similar to very precise sanding and polishing did bring success but not yet 100%
06-16-2019, 09:13 AM   #126
Site Supporter
Site Supporter




Join Date: Apr 2015
Location: Winterthur
Photos: Albums
Posts: 607
QuoteOriginally posted by reh321 Quote
... and presumably in the K-S2
It was the solenoid from a K-S1, but I had repaired the K-S2 as well, just that then I didn't realize how important closer inspection of the solenoid would be.
Which I will repeat one day.
06-16-2019, 09:16 AM   #127
Pentaxian
rogerstg's Avatar

Join Date: Oct 2007
Location: Rhode Island
Photos: Albums
Posts: 603
QuoteOriginally posted by totsmuyco Quote
Actually it scared me off buying one last week.
That's too bad.

My way of looking at it is that (adjusted for survey bias) the failure rate for the worst models (K-30/50) is only ~6% based on a 2016 survey. Pentax didn't even know that is was a problem until late 2015, so probably not addressed until early 2016 at the earliest. Most of the production for the K-30/50s was before the problem was identified and definitely before the survey was taken. So 6% for aperture control failure overall is the worst case, and probably by a lot.

For the K-S2, the surplus production is likely to be the latest production, after the problem was addressed. For me, it turned out to be correct since mine was produced 3/2017. Additionally, we have some anecdotal evidence that non use leads to failure of defective solenoids. To my mind, sitting on a shelf for 2+ years is a pretty good test of that. If it works out of the box, it already passed the test and you have a good one. If not, you can get it repaired under warranty.

I see very little risk (knocking on wood).
06-16-2019, 09:41 AM   #128
Site Supporter
Site Supporter




Join Date: Apr 2015
Location: Winterthur
Photos: Albums
Posts: 607
QuoteOriginally posted by rogerstg Quote
My way of looking at it is that (adjusted for survey bias) the failure rate for the worst models (K-30/50) is only ~6% based on a 2016 survey
I don't think so. I have closely watched offers on eBay and other 2.nd hand platforms. I think with the K-30/50 it was higher than 6%
In the German Pentaxianforum the survey failure rate for the K-30 was actually 65%! 40% for the K-50.

I don't think those figures are acurate either, too high, but 6% is way too low. The survey showed that mainly long-time members of the forum voted.


QuoteOriginally posted by rogerstg Quote
Pentax didn't even know that is was a problem until late 2015, so probably not addressed until early 2016 at the earliest. Most of the production for the K-30/50s was before the problem was identified and definitely before the survey was taken.
They must have know way before because designing/developing the new "diaphragm control unit" and then having it built will take at least 6 month of not longer!
It was in December 2015 when the first changes were applied to the K-50. I know a person who purchased the first new "diaphragm control unit" April/May 2016.
Then it was already in regular production and put in into K-30/50/500 under the 2 year warranty in the EU and Switzerland! It was later on when they realized it was NOT the complete "diaphragm control unit" but only the solenoid which was faulty, from then on when they repaired it, in most cases it was solely exchange of the solenoid itself!


QuoteOriginally posted by rogerstg Quote
For the K-S2, the surplus production is likely to be the latest production, after the problem was addressed. For me, it turned out to be correct since mine was produced 3/2017. Additionally, we have some anecdotal evidence that non use leads to failure of defective solenoids. To my mind, sitting on a shelf for 2+ years is a pretty good test of that.
Possibly a good test, yes. I never stopped people buying the K-S1 or K-S2 but recommended it. But I told them that there was a tiny chance this could happen...
and that then ... in any case... I could and would help.... of course.

06-18-2019, 08:51 AM   #129
New Member




Join Date: May 2016
Location: Central Coast NSW Australia
Posts: 20
Still going good

A follow up report - previous posts were #s 76, 80, 86, 98. Regarding a ex warranty repair, well my K-S2 is still going good,
although not used that regularly, still takes great photos when used right .
06-22-2019, 02:16 AM   #130
Pentaxian




Join Date: Jun 2019
Location: Cymru
Posts: 529
Interestingly, I've a K-S2 which I've used very, very lightly over the last few years with a sharp increase in use recently. It's now almost exactly 3 years old. It has, at times, sat for 6 months or more and I've seen no issues yet (touch wood).
06-23-2019, 09:15 AM - 1 Like   #131
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,096
QuoteOriginally posted by Benz3ne Quote
Interestingly, I've a K-S2 which I've used very, very lightly over the last few years with a sharp increase in use recently. It's now almost exactly 3 years old. It has, at times, sat for 6 months or more and I've seen no issues yet (touch wood).
Remember that every camera is different. Evidence is that the average K-S2 body will give many years of good service and never have aperture control issues of any sort.
07-22-2019, 02:04 PM   #132
New Member




Join Date: Jul 2019
Posts: 4
so i did the repair as described here: Re: K-S2 Aperture block failure repaired: Pentax SLR Talk Forum: Digital Photography Review
it worked fine but not my manual focus won't work. i can switch to auto or manual but it stays in auto all the time. anyone has any idea what i might have done?
07-22-2019, 02:48 PM - 2 Likes   #133
Site Supporter
Site Supporter




Join Date: Apr 2015
Location: Winterthur
Photos: Albums
Posts: 607
QuoteOriginally posted by elpavorealduos Quote
so i did the repair as described here: Re: K-S2 Aperture block failure repaired: Pentax SLR Talk Forum: Digital Photography Review
it worked fine but not my manual focus won't work. i can switch to auto or manual but it stays in auto all the time. anyone has any idea what i might have done?
Yes, you didn't align the inner part of the AF-M switch with the outer. It is stuck.
You have to open it again and check.

See here:
Manual: Solenoid replacement: Pentax K-S1 - PentaxForums.com

Here you can see the inner part of the AF-M switch of the K30:
https://www.pentaxforums.com/forums/members/85274-photogem/albums/13024-sole...ture127300.jpg

and here is a photo of the inner part of this switch of the K-S2:
http://h2097500.stratoserver.net/forumimages/2018/5330/5330_2018031851_11.jpg

You check that the inner and outer part of the AF/M-Switch are on AF:
The inner part is on AF when the screw-drive gear in this small hole in the metal K-bajonett is "peeping out!

But it was a bad idea to do the sanding-grinding!
It is prone to fail again.

See here:
https://www.pentaxforums.com/forums/151-pentax-k-30-k-50/385045-manual-solen...ml#post4684425

here:
https://www.pentaxforums.com/forums/151-pentax-k-30-k-50/315725-dark-exposur...ml#post4645513

and here:
https://www.pentaxforums.com/forums/151-pentax-k-30-k-50/388728-why-you-shou...t-replace.html

Last edited by photogem; 3 Hours Ago at 06:20 AM. Reason: links added
08-10-2019, 11:56 PM - 1 Like   #134
Site Supporter
Site Supporter




Join Date: Apr 2015
Location: Winterthur
Photos: Albums
Posts: 607
@elpavorealduos:
If something goes wrong during such a repair it would be very useful to know if you were able to solve the problem?

Very important for other DIYers!
08-13-2019, 11:50 PM   #135
Site Supporter
Site Supporter




Join Date: Apr 2015
Location: Winterthur
Photos: Albums
Posts: 607
Before my last message send a pm to member elpavorealduos and asked him if he was able to solve the problem. He answered:
QuoteOriginally posted by elpavorealduos:
Yes, thanks. I opened the camera again and moved the plastic bit to adjust the switch and works fine now!
I then asked him to post this here.

But no reply anymore.

We are a forum, i.e. something like a community and we try to help each other.

As I mentioned before, such situations are very important for DIYers because we learn from making mistakes.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
aperture, aperture control block, bottom, brand, camera, check, customers, date, failure, fix, guarantee, k-s1, k-s2, kit, kp, lens, lenses, models, pentax, pm, post, prices, repair, ricoh, solenoid, warranty
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
New K-50, repaired once replacing the diaphramg control block, still defective? RedSky Troubleshooting and Beginner Help 17 09-01-2019 06:16 AM
Has your repaired Aperture Control Block stayed fixed? filmamigo Repairs and Warranty Service 34 03-11-2019 01:05 PM
Do I have aperture block failure (and where do I fix it)? redridinghood Repairs and Warranty Service 5 03-29-2017 08:25 AM
does the K70 have the same aperture control block as the KS2? pcake Pentax K-70 16 02-09-2017 07:24 AM
Survey with shutter count and aperture block or shutter failure. macman24054 Pentax K-30 & K-50 256 12-30-2016 11:47 PM



All times are GMT -7. The time now is 10:02 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top