Problem identifying encoder pins

Hi,

I need help determining the pin outputs of the encoder that I want to connect to arduino leonardo (where is -, signal 1, signal 2, +). This is an encoder used in Canon Pixma TS8051/TS8251/8151/8350 printers with markings (QM7-4930) (QK21838). I have already burned one of these due to a bad connection and I would like to avoid this mistake again, but I cannot find any technical documentation and I do not have enough knowledge to determine what is what. I am posting photos from both sides.

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