GSM100 USERS MANUAL
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
DS020-7 Oct ‘06
©2006 REG No 277 4001, ENGLAND.
Page 16
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