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Analysis of common problems of supermarket anti-theft devices


Understanding the principle and installation precautions of supermarket anti-theft devices can improve the efficiency of supermarket anti-theft devices and prolong the service life of supermarket anti-theft devices.
If there is a false alarm or no alarm in the supermarket anti-theft device, the commonly used adjustment method is a potentiometer knob. If there is no response from the sensitivity adjustment, you can refer to this article to eliminate the interference. It is suitable for the 3000+ series RF anti-theft system motherboards that are currently on the market. Find the sensitivity adjustment access control, The one with sound and light alarm (receiver, the one with light), you can see the motherboard when you open the cover of the anti-theft device.
Analysis of the reasons for miscalling and not calling:
1. Whether there are anti-theft buckles, iron mesh rolling shutter doors, lamp rectifiers and superchargers, faulty communication lines, distribution boxes, strong electricity, LED lights, speakers, Christmas trees, etc.
2. If the sensitivity is too high or the noise is too low, the sensitivity will be reduced, and the sensitivity of the anti-theft label cannot be detected. The environmental noise interference will not see the electromagnetic field, so protective adjustments should be made according to the site environment.
3. Skip the loose connection of the terminal head. This will not be dealt with. It is recommended not to test your own device.
4. The motherboard is aging or broken. The motherboard is usually replaced every 3-5 years. No one can use the aging electronic components. Sensitivity debugging method: 3800 receives the motherboard. Simply put, it will alarm the antenna or detection door, usually under the anti-theft device. You can see it when the lid is open. The adjustment sensitivity and environmental test mainly check this board. The red box is the detection indicator light and the sensitivity adjustment potentiometer.
Low sensitivity: VR4 can be adjusted clockwise until the LED (DS1) detection indicator is basically stable, no light or only one light flashes lightly.
High Sensitivity: Adjust the VR4 to LED (DS1) in a reversible clockwise direction. The detection indicator is basically stable, not bright or only a light flashes lightly.
Determine the interference solution:
1. The initial installation user can test the position of the pre-installation device, check the LED detection indicator, the green light of DS1/DS2/DS3 is on, indicating that the interference is very serious, you can try to adjust the distance between the two anti-theft devices, or adjust the distance from the door frame, Remove metal products that may interfere with the anti-theft device, until DS1/DS2/DS3 three signal lights as long as DS1 is not on or as long as one light flashes lightly, indicating that the installation can be installed.
2. It has been fixed and used normally for a period of time and suddenly found no alarm or false alarm. Please refer to the above to adjust the VR4 potentiometer method. If the sensitivity cannot be adjusted down, it means that there is strong interference. Electrical appliances, Christmas trees, etc., as long as the source of interference disappears, the device will return to normal immediately.