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02-13-2017, 12:41 PM   #1
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Pentax K-50 /K-30 Stuck Shutter

Hi,

I have a Pentax K-50 and the shutter got stuck closed. I had a problem with aperture motor but I fixed be cleaning a sanding the magnet, (There is thread on Russian forum) but this is not the case just now. Aperture is working fine now with Pentax A 50mm f2 Lens in Auto aperture mode.
Could the shutter possibly got stuck while I was reassembling the camera? Is there anything I can try to bring it back to live?

Took some pictures of the shutter with mirror up in Bulb mode.

Thank you,

Vlad.

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02-13-2017, 01:08 PM   #2
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Does the camera work in live view? If it doesn't, did the shutter control board get disconnected when you repaired the aperture control motor?
02-13-2017, 01:14 PM   #3
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QuoteOriginally posted by aremmes Quote
Does the camera work in live view? If it doesn't, did the shutter control board get disconnected when you repaired the aperture control motor?
The mirror goes up in the live view, but the shutter still is stuck closed, so all I get is pitch black screen.
02-13-2017, 01:49 PM   #4
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There are several fine, solid wires in the camera. Presumably they use solid wire because it tends to stay in place when it is tucked away while assembling the camera. But it is brittle, so it breaks easily. I would look for that, if I were you. Also, be sure you didn't pinch any wires when you put the camera back together.

02-13-2017, 03:32 PM - 1 Like   #5
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Welcome to the Pentax Forums!

Just for clarity:
  • The mirror cycles even though the shutter does not?
  • The aperture controller cycles even thought the shutter does not?
  • The shutter has not worked since you did the repair?
If either of the first two points is true, when does the mirror or aperture return to base state? Example: In other than B mode, does the mirror drop when the shutter button is released or at some other time?

Warning...technical jargon ahead...

The normal cycle should be event-driven. The shutter should not open until both the mirror is up and the aperture actuated. The mirror should not drop until the shutter is closed. Is it possible that the body is in an "indeterminate state" meaning that the shutter, mirror, and aperture are out of step?* Without seeing the sequence diagram for the system, it would be difficult to tell what is out of step, but I suspect that the shutter was at the closed-but-not-returned position when the system was powered up and is not receiving the instruction to return to the "ready" position. (In your photos, it appears that the blades are in the "down" position.)

Alternatively, it could be something as simple as no power to the shutter.


Steve

* The shutter sequence operates as what is called a "finite state machine" which is sort of like a clockwork of gears and levers. If a lever is in the wrong position when the clock is assembled, the machine will be in an indeterminate state and will not operate as expected in all of its parts.

Last edited by stevebrot; 02-13-2017 at 05:05 PM.
02-13-2017, 03:56 PM - 1 Like   #6
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Couple of ideas:

1. There's a long black fiber stuck in under the lower blade. Perhaps that's jammed the shutter.

2. What happens when you pull the battery, wait a couple of minutes, reinsert it, and turn on the camera? Does the shutter cycle, but then get stuck again?
02-14-2017, 02:34 AM   #7
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QuoteOriginally posted by DougieD Quote
There are several fine, solid wires in the camera. Presumably they use solid wire because it tends to stay in place when it is tucked away while assembling the camera. But it is brittle, so it breaks easily. I would look for that, if I were you. Also, be sure you didn't pinch any wires when you put the camera back together.
I will check for any loose or pinched wires and report back. Thank you.
02-14-2017, 04:23 AM   #8
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QuoteOriginally posted by stevebrot Quote
Just for clarity:[LIST][*]The mirror cycles even though the shutter does not?[*]The aperture controller cycles even thought the shutter does not?[*]The shutter has not worked since you did the repair?
Both mirror and aperture actuate normal in all modes and shutter speeds.

QuoteOriginally posted by photoptimist Quote
Couple of ideas:
1. There's a long black fiber stuck in under the lower blade. Perhaps that's jammed the shutter.
2. What happens when you pull the battery, wait a couple of minutes, reinsert it, and turn on the camera? Does the shutter cycle, but then get stuck again?
It was a hair which disappeared this morning. Also tried removing a battery for around 10 minutes, but no luck.

On the outside fibres itself look correct, if referring to Google images. Couldn't find the one from K-50 but I assume they used the same shutter in K-5ii.

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02-14-2017, 08:40 AM   #9
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QuoteOriginally posted by vladgluhov Quote
On the outside fibres itself look correct, if referring to Google images. Couldn't find the one from K-50 but I assume they used the same shutter in K-5ii.
I wouldn't assume that since Ricoh gives an expected shutter life for the K-5ii and none for the K-50.
02-17-2017, 08:02 AM - 2 Likes   #10
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Update:
Took the body apart, and found that one of the cables on the shutter board came off. (Circled in red in 1st pic)
Simply re-soldered it back to where it supposed to be. (Circled in red in 2nd pic)
3rd pic - Camera in Live View.
Also, if you're having problems with aperture, the electromagnet (Circled in green in 2nd pic) is the thing you're looking for to fix. (Mainly the anchor inside of it)
Anyway, both aperture and shutter problems are now gone.

Thanks to everyone for suggestions.
Good luck,

Vlad
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01-08-2018, 03:09 AM   #11
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QuoteOriginally posted by vladgluhov Quote
I have a Pentax K-50 and the shutter got stuck closed. I had a problem with aperture motor but I fixed it by sanding the magnet.....
just for clarity (so that future readers don't get confused!):

You (hopefully) did NOT SAND THE MAGNET but you sanded the anchor (also named "horseshoe") of the solenoid!

This is by the way not the really best solution because it will not solve the problem permanently.
Only exchanging the solenoid with the white coloured "made in Japan" solenoid is the final solution.

Also it wasn't a problem with the aperture motor but just with the solenoid itself!
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