User's Manual

GL300 User Manual
4. Troubleshooting and Safety info
4.1. Troubleshooting
Trouble Possible Reason Solution
The SIM card is not inserted. Please insert the SIM card into
GL300.
The signal is too weak;
GL300 can’t register to the
network.
Please move GL300 into place
with good GSM coverage.
After GL300 is turned on, the
GSM LED flashes quickly
always.
PIN locked Using SIM card without
SIM-PIN, or unlock SIM-PIN.
The SIM card in GL300
doesn’t support GPRS.
Try a GPRS supported SIM
card.
APN is wrong. Some APN
can not visit the internet
directly.
Ask the network operator for
the right APN.
Messages can’t be reported to
the backend server by GPRS.
The IP address or port of the
backend server is wrong.
Make sure the IP address for
the backend server is an
identified address in the
internet.
The function of power key
was disabled by AT+GTFKS.
Enable the function of power
key by AT+GTFKS.
Unable to power off GL300.
Unable to power off GL300 if
charger connected or using
external battery.
Disconnect charger or external
battery, and try again.
Remove the Data_Cable_M,
and plug it in again. After this
operation, GL300 will exit
from power saving mode for 10
seconds.
No response from UART when
configure GL300 through
UART
GL300 is in power saving
mode.
Re-try GL300 manager tool
again, it will try to wake up
device.
Please move GL300 to a place
with open sky.
GL300 can’t get successful
GPS fixing.
The GPS signal is weak.
It is better to let the top surface
face to sky. (The same surface
with indication LED)
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