Yashica-Mat shutter sticking

[Grinsha]

I have a weird problem with my Yashica-Mat EM TLR. When focused to infinity or near infinity the shutter sticks open randomly. It happens at all speeds and apertures. When it sticks open it will close if i turn the focus knob to closer focus. It will also close if i turn the film advance lever.
Does anyone know what might be causing this?
I will attempt to fix it if its something fairly simple but if it will take a major repair i will probably put it on the shelf.

Thanks
RSN

 

[glbeas]

Theres some sticky linkage somewhere inside. Myself I would send it in for a CLA. You would need to know where and how to access the linkage inside the camera body to clean and lube the friction points. That usually involves some detailed disassembly.

 

[ic-racer]

Here are the assembly charts: http://www-unix.oit.umass.edu/~coreya/yashica/ymchttc.html

This thread may have some info to help: http://www.kyphoto.com/classics/forum/messages/6901/3491.html?1099148434

 

[Grinsha]

Thanks Guys
I ran another roll of film through it (3rd so far) and the shutter has quit sticking.
Must have been sticking because it was sitting in the junk store for 20+ years.

 

[JMC1969]

Here are the assembly charts: http://www-unix.oit.umass.edu/~coreya/yashica/ymchttc.html

Are the assembly charts for the 124G the same as the "EM" he has or even the Yashica-Mat (no extension)?