I have large numbers of a device FM5300 with electronic faults that need maintenance, and I have already succeeded in maintaining many of them, but I need the electronic circuit to complete the maintenance work, as I have more than 200 devices that have faults in the power circuit and I do not understand the circuit sequence so I need the electronic circuit of the device to now the circuit what is I/o Pins controller Pins Gps Module Pins , protection Circuit , Regulated circuit and so on