Something strange happened to me when I watched a reel one of North by Northwest. The audio was gone when I played it again. I rewinded a couple of times, switched the button for optical/magnetic up and down, and the mono/stereo with no luck. I switched to another reel and the audio was there. I switched back to reel one of North by Northwest, and still no audio. I started to panic but rewinded a bit and tried again, and then the audio was there again loud and clear!
I talked to Vidar when we used his ST 1200 and he suggested I had not made sure the button for the threading had been released. The audio is gone until that has happened. On the ST 1200 it is a button you can press at the back, but on the GS 1200 you can just pull the film just a hint at the back and the button on the top front is released (and the fan speeds up). This sounded like a good explanation and I thought that was it. But now I started to think again: Doesn't the picture go quite black until this button is released on the GS 1200 (it does not on the ST 1200)? I thought it did (but the projector is not at home at the moment so I can't check at the moment). I saw the picture very well and it was not dark as far as I can remember.
Has anyone of you experienced something like this? Maybe I am just starting to get senile and I don't remember it correctly and Vidar was right about the threading release :-) I have to check how dark the picture is while the threading button is down as soon as I get to the cabin this weekend. Maybe it isn't as dark as I thought.