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If the iris is opening to let light in, that light is not being changed to a picture signal or that picture signal is not
going into the camera circuits, What you see in the viewfinder is what is being recorded, Make sure that no cables have been left plugged in to the camera and turn the power on and off several times, I have seen the iris stick when cameras were not used for a while. The iris is inside or behind the lens and closes completely when you turn the camera off, If it is stuck, SOMETIMES it will open with repeated tries of turning it off and on or even removing the battery and putting it back in. And maybe it is just the vibration of opening and closing the battery compartment door or the slight vibrations of pushing the power button repeatedly. If it sticks once, it will stick again. This is not a repair, just a way to get those one time pictures' before.
if the lens cap auto closes, when it is on, try to tap slowly near the lens, very gently, and check again....repeat several times, it should work. the other options are taking it to qualified service tech, just beacuse its has very fine gears.....try it, reason for tapping is, the switch indicator is stuck, and gives wrong signal...dust paritcals could be the reason for that..
When you dropped the camera you ended up jamming the iris closed. There may be additional damage within the lens assembly. In order to repair the stuck iris, the optical lens assembly needs to be partially disassembled. This is not a project for the novice. This should be taken to a JVC authorized service center for a repair estimate. The estimate will cost about $50 or so.