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power led of sim 300 based gsm modem is not glowing

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ravi8820

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In the sim 300 hardware specification it is written that supply voltage should be 3.4-4.5 volts. But the GSM modem board in which SIM 300 is contained is having a starter guide in which it is written that "Operating Voltage: 7 – 15V AC or DC (board has onboard rectifier) ". Then Why power led of sim 300 based gsm modem is not glowing when external supply port is directly connected to the 9 volt dry cell...........How can i correct it??????? Please reply soon..............
 

Here i am attaching the link containing schematic of my board........................"http://obrazki.elektroda.pl/1904906000_1356501081.png". Please reply soon...........
 

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