Troubleshooting Tips - QTech SMS Lite 4G User Manual

Troubleshooting Tips

A) Make sure you have reception bars on your phone in the same place as the device in case
there is a network coverage issue.
B) Check the account balance for the SIM card (phone number) and ensure there is enough
credit for sending texts0.
C) Make sure when you power up the device you see the heartbeat indication. If you see
nothing on the LED after the initial boot sequence of flashes then inspect the LED on the
modem board. If there is no indication on the modem board then the device has not
registered on the network. If you see a periodic slow on-off of the LED then it appears to
have registered but if the main board LED is solid on or off then there is a fault on the device
and it may need reprogramming with firmware. Also see troubleshooting tip (I).
D) If the test message results in the LED test pattern displayed this means that the device is
successfully registered on the mobile network and is receiving messages.
E) If the test message displays the test pattern but a test response message is not received by
the phone, this means there is a problem with the device on the network. It could be an
incorrect SCA service number, incorrectly provisioned SIM, issue with account balance or
other error. The user should contact the SIM provider to check that the SIM is correctly
provisioned. Alternatively, the SIM can be checked in a phone by sending a message from
the phone. Also, double check that the LED in the modem daughterboard is flashing on and
off slowly.
F) If the test pattern is not displayed this means that the device may not be registered on the
network or there is a lack of coverage or network unavailability or that the network does not
offer coverage in the frequency band classes supported by the device hardware. If the SIM
works correctly in a phone, then the issue may be one of frequency band operation. Contact
QTech for assistance.
G) If the device appears to be operating normally and you have programmed it with a valid
phone number in the address book to receive alarm notifications then ensure that you do
not receive the transmit fault indication (three long flashes). This usually indicates that the
programmed phone number in the address book is incorrect. It can also indicate that there
is a problem with network availability.
H) If the device appears to be operating normally but inserting a SIM from a new provider has
caused it to stop, then using the old SIM, send the INFO command to obtain the firmware
version number and note the response. The firmware may require updating in order to
support the new SIM. Contact QTech for assistance.
I) If the device apparently suddenly stops working or does not work properly after the device
has been powered up after a sustained period of being off, or if it has been used extensively
in a phone before use in an SMS Lite, then it may have received network generated txt
messages that it is unable to process. Try removing the SIM and placing it in a phone then
clear all new messages and also clear any old messages that may be stored on the SIM. Then
replace the SIM into the SMS Lite and power it up. This issue might also be resolved by
upgrading to the latest version of firmware.
SMS Lite 4G– User Guide © 2021 QTech Data Systems Ltd
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