Just checked and according to Yashica in the manual "Do not change the shutter speed when the shutter is cocked" apparently it can damage them.
No nothing, timer is just sticking where its set, no tension in the shutter release, its like its already cocked but not releasing.
My brother picked it up and was playing with it last night, I remember telling him not to press the shutter etc or wind on the film advance as it was loaded with FP4, I have a feeling it was too late and he had already cocked the shutter as well as turned everything in sight.
He should have known better, he's had TLR's before, I havent, and not having a lot of luck, got a nice collection of Yashica paper weights up until this one and its mint, one owner from new... oh well thats £90 on repairs next month then.