This machine connected to the power switch, electronic search like with rasterized, remove the lens cap, electronic as found in scene images, watch found no image viewfinder upper power situation display character starts to disappear. In order to quickly determine the fault parts, with good communication adapter connect the camera and monitor, monitors the scene image is normal, to estimate fault exists in the video signal input circuit, circuit as shown in figure. 4LKservice manual download site
 4LKservice manual download site
Find like electronic device and open the lid, take along the box in the camera with warehouse replay, monitor color images and audio signals are all normal, integrated block is driven by oscilloscope to observe the viewfinder IC701 (18) feet no video signal input, the oscilloscope probe will be moved to the connector P701 (4) feet no video signal output, use hand connectors J1504 plug, inside the viewfinder image back to normal, fault appeared loosen the hand, cause of the malfunction is J1504 (8) feet caused by the poor contact. Remove the plug with 6 needle front roll a little, and degreased cotton swab with anhydrous ethanol jack and pins. Finished in order to ensure jack contact with pins, scrub with a needle into the socket flange, will contact jack reed pull tight a little, and then insert the plug, inside the viewfinder image and character display returned to normal.4LKservice manual download site