CHC i80 - 4:Network Problem; The Receiver Cannot Dial On, Showing Offline on the Webpage, Network Module Continuously Resetting

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4:Network problem
4.1 The receiver cannot dial on, showing offline on the webpage, Network
module continuously resetting.
Detection Method&Solution:
(1)Sim card error, if yes please replace a sim card
(2)Sim Card slot problem, if yes please replace a sim card slot
(3)GPRS module problem, please detect the voltage of the GPRS module, the normal
C5 output voltage is 4V, otherwise please replace the mainboard.
(4)Mainboard communication problem cannot get the sim card parameters, please
replace the mainboard.
(5) Signal strength low, if yes please replace the GPRS attached antenna..
(6) Parameters setting error Please input the right parameters
C5：
The arrow point out C5