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Most likely, the pinout will coincide with similar indicators for which you will find a datasheet. The only thing to find out is the common anode (+) or cathode (gnd)
In the general case, you will have 3 anodes or cathodes and 7 pins for segments.
Management is dynamic indication. Those. first we connect one anode (or cathode) and turn on the necessary segments, then the second, etc. At a high frequency, the eye will not notice that in fact each digit is turned on in turn.
Common anode:
https://lib.chipdip.ru/195/DOC000195193.pdf
Common
cathode:
https://lib.chipdip.ru/195/DOC000195397.pdf
so that the segment starts to glow), or through a current-limiting resistor and a voltage source.
8, 9, 12 pins respectively anodes or cathodes of digits.
The rest of the outputs are segments.
If you apply a plus to 8, 9 or 12 segments, and a minus to any remaining pin and the segment will burn (this is for dialing with a multimeter, if you are testing from a voltage source, for example 5V, then use a 200-300 Ohm current limiting resistor) , then this is a common anode. If it works when the polarity is changed "-" to 8/9/12 pins, and plus to one of the pins of the segment, then the common cathode.
6 output is not used (you do not have it)
And who's stopping you from taking the power supply and going through the resistor through all the pins? And write down in what combinations which segments light up?
Take two wires with 5 volts on them and a resistor from 300 ohms to 1.5 kOhm - the resistor must be connected to one wire. Another wire to any output of the indicator, with the output of the resistor you sort through the remaining outputs of the indicator and look at the result - no, you change the wires in places and repeat the search.
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