1. Find the sensitivity adjustment access control, sound and light alarm (receiver, the one with light), and open the lower cover to see the motherboard.
2. Analysis of the reasons for misbid and non-bid
①Whether there are anti-theft buckles, iron mesh shutters, lamp rectifiers and superchargers, shortcomings communication lines, distribution boxes, strong currents, LED lights, speakers, Christmas trees, etc. near the 1.5m radius of the on-site environmental noise interference detection equipment.
②The sensitivity is too high or too low. The noise is too low. The sensitivity is reduced. The anti-theft tag cannot be detected. The sensitivity is added. The environmental noise interference is the invisible electromagnetic field, so it must be adjusted according to the on-site environment.
③Skip the loose wiring of the terminal head, this will not be dealt with. It is recommended not to test your own device.
④The motherboard is aging or broken. The motherboard is usually replaced every 3 to 5 years, and no one knows the aging of electronic components. C. Sensitivity debugging method The following figure shows the 3800 adopting the motherboard. Simply put, it will alarm the antenna or detection door, usually below It can be seen when the lid is opened. The conditioning sensitivity and environmental testing mainly check this board. Inside the red box are the detection indicator and the sensitivity conditioning potentiometer. Low sensitivity: VR4 can be adjusted clockwise to the LED (DS1) detection indicator is basically stable, not bright or just a light flashing. High sensitivity: VR4 can be adjusted counterclockwise to the LED (DS1) detection indicator is basically stable, does not light or only needs a light to shine.
3. CC alarm status
4. Judging the interference solution:
①The initial installation user can test the position of the pre-installation device and check the LED detection indicator. The DS1/DS2/DS3 green light is on, indicating that the interference is serious. You can test and adjust the distance between the two anti-theft devices, or adjust the distance to the door frame. In addition to metal products that may interfere with the anti-theft device, until the three signal lights of DS1/DS2/DS3 only need DS1 to be off or only one light to flash lightly, it is stated that the device can be installed at the device.
②It has been fixed and normal operation for a period of time and suddenly it is found that no alarm or false alarm is found. Please refer to the above for adjusting the VR4 potentiometer. It is found that the sensitivity cannot be adjusted to indicate that there is strong interference. Check whether there is a new strong current or communication line or electrical appliance nearby. , Christmas tree, etc., the interference source only needs to disappear and the device will return to normal immediately.