Troubleshooting - QTech SMS Lite 4G User Manual

Troubleshooting

If you experience difficulties getting the unit working in your area it may be for a number of reasons
including (but not limited to):
1. The account balance on the SIM is zero.
2. The device is out of mobile network coverage, which may also depend on the antenna being
used.
3. The SIM is from an unrecognised Mobile Network Operator (MNO).
4. The device is operating in an area where the mobile infrastructure (such as frequency band
or protocol) is not supported by the SMS Lite device hardware.
5. The SIM is from a virtual mobile network operator and may be using a different SMS SCA
(Service Centre Address, sometimes referred to as service centre number) or the SCA has
not been programmed or provisioned on the SIM correctly.
6. The device is running on older firmware which can result in issue number 3 above.
There are some actions that can be taken to assist QTech with diagnosing the issue. These involve
carefully noting the actions of the indicator LED as it powers up and also counting the number of
pulses in an error code when it is displayed.
The typical boot sequence when the device starts is as follows:
The device will turn the indicator status LED on then flash briefly with a number of flashes
-
(potentially flash code 7 indicating the device is busy).
- The device then turns the indicator off and if there is another error code this will be
displayed (e.g. flash code 5 indicating not yet registered on the network)
If this error code is repeatedly displayed, then this is the code that should be reported to
-
QTech.
- If the error code is replaced by the heartbeat indication (very short flash every few seconds)
then the device is in its normally operating mode and is registered on the mobile network.
You can quickly check the unit is running by performing a verification test if your device is running
version 4.04 of the firmware or later.
Running a verification test
Step Description
1 Remove the top cover of
the unit
SMS Lite 4G– User Guide
Note
Power down the device.
The top cover is held in place using dimpled locators. The cover is
"sprung" open by gently prising the lid corners up. A flat bladed
screwdriver can be used to assist but ensure that you avoid
touching the electronics unnecessarily or scratching the device
metalwork.
© 2021 QTech Data Systems Ltd
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