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[Donyet]

Now that I have access to the shutter on my Yashica-Mat LM, it's time to figure out what is wrong with it.
 
The shutter is in the closed position at the moment. When I cock the shutter and press the release button nothing happens. The lever that

[Mareklew]

First step is to determine, whether the shutter cocks and releases, but doesn't open, or it is cocked and can't get released.
 
The shutter is an independent sub-assy, so you can move the cocking lever and the release lever by hand, the

[Donyet]

Thanks Marek,
 
The M-X lever does indeed make the whirring sound when I set it from X to M, which is what my working Yashica-Mat does, so I think that part may be fine.
 
When I cock the shutter with the cocking lever, and press the shu

[Donyet]

Oh and yes, I've tried operating these levers directly on the shutter and still no 'click'.

[Mareklew]

How hard is the tensioning lever to move?
If the shutter is cocked (and can't get released) you press only against a weak return spring that makes the lever go back after cocking shutter. If the shutter isn't cocked because the main catch isn't c

[Donyet]

Hello Marek,
 
To be honest I've never taken apart a diaphragm  on a camera. I may need the full descrition if you have the time.  
 
The timer does not work, although now that I've tried testing it I now have both the timer lever and the

[Donyet]

Oh and yes, the cocking lever was quite easy to turn and there was little resistance when I would do the cocking motion to return it back to position. I have the camera disassembled at the moment so I can't test that right at this moment.

[Donyet]

If it helps, I think the shutter is jammed in the cocked position.

[Mareklew]

Okay, sorry for the delay, I'm on holiday.
 
 
At each step it's a good idea to take a picture of what you are going to remove with a digicam or even a better camera phone. Especially pay attention to spring ends (their hook points as well

[Mareklew]

Now you should have the shutter in your hands.  
 
Step 6: The front is held by a notched ring. This ring is a screw nut - it unscrews, but is secured by means of either a normal tiny screw, or an eccentric latch. Either you need to unscrew the sm

[Donyet]

Hello Marek,
 
Here is the shutter, open to the world.
 


 
 
I was not sure what you meant by 'E' clip in regards to the self-timer assembly.  
Here is

[Mareklew]

Alex, right now I'm hanging on GPRS connection, so I will not be able to uplooad pictures, too slow. I will try to describe as much as I can, the rest will have to wait till Tuesday.
 
1. Identifying what is what:
- From about 11 o'clo

[Mareklew]

Note: from now on I suggest you wear thin latex/rubber household gloves. Skin oil corrodes and there are parts here that rely on smooth sliding against each other. Check the gloves' fingertips often and replace them as soon as they get mucked up with gr

[Donyet]

Hi Marek,
 
I was out on a day trip today and didn't get to the shutter.  
 
I will certainly keep an eye out for a possible 'E' clip loose inside the shutter. I will post my findings as soon as I get back to it.
 
Thanks,
Alex

[Donyet]

Hello Marek,
 
I finally fgured out the self-timer and what was keeping it attached. This design has a small screw similar to the screw that keeps the shutter cover nut from turning. One quarter turn let the self-timer loose. I added arrows pointin