What is the normal power supply for the analyser?
In normal mode, the analyzer is powered by a Switching Adapter with output voltage 12V. If the device is powered by another source, for example car battery, a voltage, suitable for the adapter has to be ensured. In case of doubts about the correct work of the analyzer, measure with a multimeter the value of the voltage. It can be done without dismounting the analyzer, but using the coupling for connection of the outer printer. It is next to the power supply coupling; in fact they are 2 parallel couplings.