Siemens S-15 Camera Lighting Inconsistant Pls Help

Hi we are running S-15 here and the LED for the component camera is not all bringht at the same brightness level. This cause us to use different .gf for our standard component. It is hard to ballance the illumination level between machines. Does anyone know how to adjust the illumination level (I think it is one of the screws on the camera card pls tell me which one??) Thanks in advance Bach

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