Common faults and analysis of EAS system [Bohang China]

Common faults and analysis of EAS system [Bohang China]

1. Check the self-sounding and non-alarming steps of the user manual.

2. General fault detection process (RF):

a) The multimeter detects whether the power supply voltage is normal. When the load is not loaded, the voltage is 24V-25V, and the minimum voltage cannot be lower than 22.5V. When the load is loaded, the voltage is 24V-25V, and the minimum voltage cannot be lower than 22.5V. When there is no load and when there is load When the voltage changes greatly, the power supply is insufficient or the board is short-circuited. The voltage is too high and too low are power failures, the field can repair the power supply, and the power supply cannot be repaired.

b) Short circuit judgment of circuit board: Measure the resistance value. If the resistance value is very small (close to 0 Ω), it is basically determined that the circuit board is faulty, and the circuit board cannot be repaired at the scene.

c) After the above tests are normal, you can consider debugging the sensitivity of the board.

3. There are more than 3 devices installed on site, and one of the two sides of the launch is not normal (self-sound or not reported - RF)?

a) Detect the transmitting antenna with EAS and check it multiple times. If there is no frequency, check the online line or the main and auxiliary jumpers.

b) Use EAS to detect the transmitting antenna, and check it multiple times. If it is not available at the time, it determines that the transmitting circuit board is faulty. If it is used online, it needs to detect the main transmitting circuit board. Generally, the main transmitting board is bad.

4. There are 4 or more devices installed on site, working online, all the devices are not working (RF)?

a) Detect the power indicator and detect the output of each power supply, especially the main transmit power.

b) Use EAS to detect the main transmitting antenna to see if the transmitting frequency is normal, including the center frequency, modulation frequency, sweep width and so on.

c) If the main launching board is broken, replace it with the standby board directly; if there is no spare board, the main and sub-transmitting board mode can be replaced (that is, the main jump is paired, the secondary jumps into the main), and the online line is adjusted. Or directly adjust the transmitter board and the receiver board, and the debugging can be normal.

5, installed two or more equipment, often on the edge of the self-sounding (RF + AM)?

a) Check the nearest shelf to the equipment, less than 2 meters away, and try to remove it as soon as possible.

b) Check whether there are any new equipment around, such as children's car, freezer, etc., as far as possible, the distance is more than 2 meters, can not be removed, power off test

c) Check the presence or absence of coiled wires, cables, or coiled wires, cables, and tow boards (RF).

d) Detecting the presence or absence of temporary power wires and cables passing through the periphery of the equipment, such as children's car power cords, electric vehicle chargers, power cords for other electrical equipment, etc.

e) Detecting the presence or absence of debris, such as garbage bins, glove boxes, etc.

6, install a number of equipment, relatively in the middle of the equipment often self-sound, the other basic normal (RF + AM)?

a) Debug and replace the circuit board, which can be replaced with other circuit boards on site.

b) Check for new billboards, especially new ones.

c) Check if there are any new electrical appliances close to the intermediate equipment, and whether there is any construction on the ceiling to prevent the looped wires and cables from being on the ceiling.

d) Move away from the device, the position of the mobile device is several tens of centimeters, etc., to determine the interference signal orientation.

e) Eliminate sources of interference.