I'm sorry, but it is an AT-1, not TX. I am not very knowledgeable about these. When I push the lever to the Lock position, the shutter release will not depress. When I move the lever to the other positions, the release will depress, but nothing happens. The film advance lever acts as if it is locked when lever is in all positions.
When the shutter is released, does that mean that the inner piece that flips up when release is depressed is in the down position? I apologize for my ignorance. If pics would help, I can post. Thanks.