Question about MLU on Bronica ETRSi with AE-iii prism

[kcmy]

I just received my ETRSi with an AE-III prism.
I mounted it on my tripod and focused on my subject in A mode, then pressed the M button to lock exposure. Flipped up the MLU switch and fired away.
My question is, should the MLU switch back off on it's own, or do I have to do it manually, which I did. I've gone over the manual several times and it doesn't say what should happen after I fire.
I'm not finished with my first roll of film yet, so I would appreciate any input before I go any further.
It's the 40th Anniversary edition if it makes a difference.

Thanks

 

[moto-uno]

Hi
The MLU will stay on unless you flip it back after the picture is taken.Peter

 

[lxdude]

And flip it it back after the shot but before winding to the next frame, or it will expose that frame when you flip it back.