DS020-7 Oct ‘06

©2006 REG No 277 4001, ENGLAND.

Page 16

CHAPTER 6

TROUBLESHOOTING

6.1 The modem’s LED does not light :

Check if the modem has connected to a 5-32V power supply properly

Check if the power connector is properly inserted

Check the fuse on the power cord

6.2 The modem’s LED lights but does not blink long time after power up

Check if a valid SIM card has been inserted properly

Check if the SIM card has been locked (refer to AT+CPIN command in AT command guide)

Check if the external has been connected properly to the modem

Check if the network coverage is available.

6.3 The modem does not response to the terminal program

Check if the RS-232 cable has been connected properly

Check if your program has proper setting. Factory setting of the modem is:

9600bps

8 data bits

no parity bit

1 stop bit

6.4 No voice could be heard for the modem’s speaker output when a call is answered

Make sure a voice call has been made (refer to AT command guide)

Enter the AT+SPEAKER=1 command