Connected to the power switch, remove the lens cap, a camera scene target, electronic search like on the image. HNMservice manual download site
 HNMservice manual download site
Camera scene, electronic search like on the image, insert a box image quality good replay with box, electronic search like the image on the screen is normal, the preliminary judgment fault in the camera part of the circuit, in order to quickly determine the fault parts, to connect the power switch, observe the instant camera is no power supply is connected "click" sound, aperture is not open after turning on the power supply, fault in the aperture in the drive control circuit, open the machine on the right side of the chassis, use a multimeter to check aperture Q701 drive transistor collector 5 V voltage is normal, check the base and the emitter voltage, normal collector voltage Vc is 5 V, Vb, Ve is 2 V to 1.3 V. Further examination revealed R725 resistance welding, thus causing the output aperture IC704 7 foot drive control voltage cannot be sent to Q701 base, aperture motor movements. Again after good R725 resistance welding machine back to normal.HNMservice manual download site