Open the cam take out the lens, open it carefully takeout the aperture unit remove the cables solder, check the aperture control with a 2 volt DC power, if it is struck manually open an shut, if not working with DC power it means faulty, change the lens unit.
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Open the cam take out the lens, open it carefully takeout the aperture unit remove the cables solder, check the aperture control with a 2 volt DC power, if it is struck manually open an shut, if not working with DC power it means faulty, change the lens unit.