Maestro 100 2G Series, Quick Start Manual & User Manual, Page: 29 / 31

Chapter 7
Troubleshooting
7.1 The modem’s LED does not light
– Check if the modem has been properly connected to a 5-32V power supply
– Check if the power connector is properly inserted
– Check the fuse in the power cord
7.2 The modem’s LED lights but does not blink long time after power up
– Check if a valid SIM card has been properly inserted
– Check if the SIM card has been locked (refer to AT+CPIN command in AT command guide)
– Check if the external power has been properly connected to the modem
– Check if the network coverage is available
– Make sure that the CTS and DTR pins of the serial port are not connected together
7.3 The modem does not respond to the terminal program
– Check if the RS232 cable has been properly connected
– Check if your program has proper settings. Factory setting of the modem is:
•
115200 bps
•
8 data bits
• No parity bit
•
1 stop bit 4.
7.4 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 AR+SPEAKER=1 command
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