Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-15-2020, 05:10 AM   #16
Pentaxian
Ivan's Avatar

Join Date: Dec 2019
Location: Riga
Posts: 581
Welcome.

11-15-2020, 05:33 AM   #17
Veteran Member
bluestringer's Avatar

Join Date: Nov 2011
Location: Cotton fields of South Georgia
Photos: Gallery
Posts: 2,745
Welcome.
11-15-2020, 10:42 AM - 1 Like   #18
New Member




Join Date: Nov 2020
Location: Ontario
Posts: 5
Original Poster
QuoteOriginally posted by RobSpain Quote
SSDCanada 630 shots. That's crazy! Sounds like a classic case of this problem arising due to LACK OF USE. I've read in some posts that this is possible due to the solenoid becoming magnetised over time.
RobSpain - Interesting idea! but you would expect greater use to cause magnetization as each time the coil is activated the solenoid material would become more magnetized. And if it did get magnetized over greater usage, that points to an error in material selection as the iron composition of solenoids was not selected properly - that is a field all on it's own! So who knows but it points to someone somewhere making a saving of a few cents to push profits instead of quality - never a good idea!
11-15-2020, 04:46 PM   #19
Veteran Member




Join Date: Sep 2018
Posts: 304
Welcome!

11-15-2020, 05:53 PM   #20
Senior Member




Join Date: Dec 2019
Photos: Albums
Posts: 167
Welcome to the forum!
11-22-2020, 01:24 AM   #21
Pentaxian




Join Date: Nov 2018
Posts: 673
QuoteOriginally posted by RobSpain Quote
SSDCanada 630 shots. That's crazy! Sounds like a classic case of this problem arising due to LACK OF USE. I've read in some posts that this is possible due to the solenoid becoming magnetised over time.
Yes, this seems to be a very clear example from lack of use. Hope it gets sorted out one way or the other, and welcome to the forum, SSDCanada!
11-22-2020, 12:05 PM   #22
Site Supporter
Site Supporter
Photos-by-Chas's Avatar

Join Date: Jul 2012
Location: Northwest Pennsylvania, USA
Photos: Gallery | Albums
Posts: 1,221
I have almost 1,000 shots on my K70 so that may be a good sign.

11-29-2020, 05:35 PM - 2 Likes   #23
New Member




Join Date: Nov 2020
Location: Ontario
Posts: 5
Original Poster
K70 aperture solenoid replaced successfully

Hello,

After receiving the replacement white solenoid I was able to dive into the K70 and replace the green one that was causing the dark shots.
Some important differences learned during repair, after following photogem's excellent tutorial but which was for a K30.
1) All the screw locations are similar EXCEPT you do not need to remove the one on the inside, bottom of the battery compartment. I realized this after seeing that the screw was partially over-lapped by the battery cover wall so it must have been screwed in at another stage in the manufacture.
2) There is a third screw located on the side where the HDMI port is located. This is again different from the K30 which has two. Removed by pulling away the rubber sheet attached with double-sided tape.

Apart from that the replacement of the solenoid is straight forward, test pics afterwards appear back to normal: a heavy paperweight has been restored to something useful!

Only other advice would be to use high quality cross head screwdrivers. You should be able to hold a removed screw horizontally against gravity with a good cross head screwdriver.
11-29-2020, 06:54 PM   #24
Senior Member




Join Date: Dec 2019
Photos: Albums
Posts: 167
Welcome from Berlin!
12-27-2020, 12:36 AM   #25
Site Supporter
Site Supporter




Join Date: Apr 2015
Posts: 2,756
QuoteOriginally posted by SSDCanada Quote
Hello,

After receiving the replacement white solenoid I was able to dive into the K70 and replace the green one that was causing the dark shots.
Some important differences learned during repair, after following photogem's excellent tutorial but which was for a K30.
1) All the screw locations are similar EXCEPT you do not need to remove the one on the inside, bottom of the battery compartment. I realized this after seeing that the screw was partially over-lapped by the battery cover wall so it must have been screwed in at another stage in the manufacture.
2) There is a third screw located on the side where the HDMI port is located. This is again different from the K30 which has two. Removed by pulling away the rubber sheet attached with double-sided tape.

Apart from that the replacement of the solenoid is straight forward, test pics afterwards appear back to normal: a heavy paperweight has been restored to something useful!

Only other advice would be to use high quality cross head screwdrivers. You should be able to hold a removed screw horizontally against gravity with a good cross head screwdriver.
I just happened to find your thread because sadly it was not in the K70 section, I don't read all new posts because way beyond my time/capacity.
I actually wrote a tutorial for the K-70 already in September 2019, you find it here:
Tutorial/Repair Pentax K-70 with aperture-problem: Exchange solenoid - PentaxForums.com

The good quality cross-head screwdrivers are also mentioned in my tutorials, as they best are JIS (Japanese Industrial Standard), great value one finds for a good price by Vessel: "Vessel Set 9902"


Anyway, it is good to hear that another K-70 was saved.
12-27-2020, 05:30 AM - 1 Like   #26
New Member




Join Date: Nov 2020
Location: Rhode Island
Posts: 3
That repair is an absolute breeze. The worst part of it is worrying about screwing it up! The camera already doesn't work... What's left to lose?
For my K30, I was in and out in 35 minutes total - including soldering.

<Edit>
Glad it's saved!

Last edited by Karasu1970; 12-27-2020 at 05:44 AM.
12-27-2020, 10:01 PM - 1 Like   #27
New Member




Join Date: Nov 2020
Location: Ontario
Posts: 5
Original Poster
QuoteOriginally posted by photogem Quote
I just happened to find your thread because sadly it was not in the K70 section, I don't read all new posts because way beyond my time/capacity.
I actually wrote a tutorial for the K-70 already in September 2019, you find it here:
Tutorial/Repair Pentax K-70 with aperture-problem: Exchange solenoid - PentaxForums.com

The good quality cross-head screwdrivers are also mentioned in my tutorials, as they best are JIS (Japanese Industrial Standard), great value one finds for a good price by Vessel: "Vessel Set 9902"


Anyway, it is good to hear that another K-70 was saved.
Appreciate that, I didn't find your K70 tutorial. But it's fixed now, seems daunting when you look at the intricate mechanisms and the fine details, worrying that it will never go back together - but it did!
A google search is what directed me to your tutorial and then I joined the forum when I saw the K30 repair.
Cheers!

---------- Post added 12-27-20 at 10:02 PM ----------

QuoteOriginally posted by Karasu1970 Quote
That repair is an absolute breeze. The worst part of it is worrying about screwing it up! The camera already doesn't work... What's left to lose?
For my K30, I was in and out in 35 minutes total - including soldering.

<Edit>
Glad it's saved!
Yes thanks saved camera and a lot of money!
Best
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!
camera, k-70, k30, k70, k70 aperture block, life, lx, mirror, move, repair
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
new to this forum i have a qestion about the k70 replacement Amm Welcomes and Introductions 15 07-16-2019 06:13 PM
Any reports on new K70 macdaddy50 Pentax K-70 & KF 10 07-16-2019 05:48 PM
New K70 sensor problem ikonographics Pentax K-70 & KF 12 06-22-2019 05:37 AM
New member, senior member, pentaxian, site supporter etc.... DaveHolmes General Talk 7 05-02-2011 02:34 AM



All times are GMT -7. The time now is 04:14 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