Sharing all kinds of common faults in all-digital building intercom and how to deal with them

Question 1: There are snowflakes

Possible cause one: Check whether the 18V visual power supply is connected to the door machine, causing the camera to overheat;

Treatment: Correct wiring. (Note: Most manufacturers' building intercom mains power supply is 12V power supply)

Possible cause 2: Chaga (check) whether the visual power supply on the extension is 18+/-1V;

Solution: Whether the extension to the power supply distance is too far, and whether the power cord is standard.

Possible cause three: weak image signal causes the line to be out of sync;

Solution: Check if the video line contact is good, whether the transmission distance is too far, and whether the line is standard.

Question 2: The image is blurred and dim

Possible causes: the signal is too weak, the impedance is not matched or the contrast is not good;

Processing method: a, adjust the 75 ohm impedance switch on the back of the extension;

b, contrast, brightness is not good, you can adjust the potentiometer to improve the image.

Question 3: The visual extension has a raster without an image

Possible reasons: The entire building visual extension has no image, check the video output V of the door machine to the first-level video distributor, whether the input terminal wiring is positive or negative, whether the video distributor is connected to the power supply, and the input and output ports cannot be connected. wrong;

Solution: Connect the video distributor to the power supply and connect the input and output video cables correctly.

Remarks: In the case of building intercom video, first of all, consider the line problem (check whether the wiring is correct, whether the line meets the standard, and at least meet the standards proposed by the supplier).

Secondly, consider the power supply problem (in addition to checking the power line, the main test power supply power, look at whether you eat three meals, dry ten pounds live!), then consider the video impedance mismatch (can insert or pull up the indoor extension, Jumpers at the floor platform to solve).

Finally, consider the building intercom system or related equipment failure; it is recommended that such faults assist the supplier technicians to solve the problem together (special note: most building intercom systems without floor platforms, the video is mainly caused by transmission line and impedance mismatch).

Bead

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