Seikosha MXL - bulb

[dxq.canada]

I am working on a Seikosha MXL shutter.
Got the slow speeds running slow again, but I cannot seem to figure out how to get Bulb working.

I have searched the web but I cannot find a definitive pointer to this.

 

[mikemc_photo]

Look for the bulb lever, the spring is broken, or the lever is bent.

 

[dxq.canada]

Ah, yes ... problem is that I can't seem to figure out where that is.

Here is an image from the web of same shutter: http://livedoor.blogimg.jp/camera_repair_minoha/imgs/e/0/e05a9058.jpg
Are you referring to the lever that is at 9 o'clock ?

 

[mikemc_photo]

Put the speeds dial to bulb, the bulb lever will be easy to see as it will move between 1 sec and B when the cam is moved

 

[btgc]

I've opened shutter for the same bulb issue. Here's a picture of shutter made by RFF member I've found when dealing with mine.

 

[dxq.canada]

OK, I figured it out.
The lever that you guys are talking about is moving freely (the one attached to the slow speed gearing mechanism).
What puzzled me what what mechanism kept the shutter cam from turning all the way while the shutter release button is kept down.

... then I found it. The problem is a lever (outlined in red) that is under the shutter release lever. It is not easy to see once the speed cam is on.
The lever was not moving freely, so it did not contact the release cam.

 

[btgc]

dxq.canada, could you please take a look and outline in color how is shaped spring under shutter release lever? one end is connected to lever, is wound around base but where free end goes?

 

[dxq.canada]

It is an L shaped arm, with a slight indention at the outside elbow edge.
It pivots on the top screw.
Not sure why there is a hole ... possibly to add some oil ?

 

[farlymac]

I think the holes are there to make it easier for a technician to move things around while testing the mechanism. At least, that's what I use them for (insert dental pick, and shove).

Most shutters don't need any lubricant, although that isn't true for the really old ones, and the the Synchro-Compur (which is what the Seikosha MXL was designed after). But they use lubricant in very specific places, and you need a diagram to know where to apply it, and what type to use.

Put the wrong lubricant on there, and it can migrate to the shutter blades. Then you'll have more problems than you can shake a stick at.

Here is a better photo of the part in question, btgc, showing the placement of the spring.


DSCN1198_2 by br1078phot, on Flickr

As you can see, this lever is controlled by the MX switch (and that the OP's shutter is of a slightly different design, since it's from a TLR, not a 35mm rangefinder).
PF

 

[btgc]

Thank, PF! I should be more clear, I'm puzzled by spring-s around release actuator lever - below one you are kindly displaying. On your other shot I linked it is visible better, just wondered by fact on shot by dxq there's only one spring visible - from the lever with hook at the end and not from release actuator lever.

 

[farlymac]

You talking about the lower spring on this piece, btgc?


DSCN1206_2 by br1078phot, on Flickr

And it's operating position?


DSCN1196_2 by br1078phot, on Flickr

PF

 

[btgc]

This is brilliant detail (in mine this spring were put somehow else) but I were trying to say about lever..latch? which nornally sits on a pin (below hole in L-shaped lever). Which is removed in your lower picture, activated by a vertical lever, which actuates lever with a hooked end which engages with a shutter rim.

 

[btgc]

PF, I found on your flickr set everything I needed. Truly great, thanks a lot!

 

[farlymac]

You're welcome, btgc.

PF