How is the main blue board/ PCB on the back called? Where can I buy it? It
can be use with Arduino UNO, But I still have to find this one.
From the manufacturer. It is a custom PCB.
The PCB by itself? without the components? We are trying to get the board alone with nothing on it, completely empty
Ask the manufacturer if they sell the unpopulated board. Chances are small to zero, though.
If you have it (not only photo) - it shouldn't be difficult to copy, i don't see anything complicate in the pcb
What do you actually want to do and what does this board do ?
I'm completely new at this. Do you know where I can copy it? Or a manufacturer that you can recommend?
It takes analog data and allows to share this data through internet/wifi. Im learning little by little.
Sorry, my English too weak to formulate it.
You have to make a copy of board schematic with PCB-design program such as EasyEDA or Eagle and than order the new boards in any PCB-making service
You will have to STRIP ALL the components off the boards and have it copied photographically, then have a new circuit board made from the images. No honest company would copy a board you did not first produce, but someone in China might do it,
I doubt this is a good option. It would be better to "draw" a new board in EasyEDA using this as a sample.
Also there will be less problems with copyrights 
Not only that but it might be a multilayered board.......so goodnight to the copy idea.
The naked board does you no good unless you mount all the correct components.
What is your plan for doing so?
Hi,
The device with 6.5 written on it may be a programmable device, no code on go.
What is the part number on it?
Why can't you purchase another assembly, just to replace the whole thing?
Thanks.. Tom.. 
This board, which seems to have an ESP32WROOM ESP8266 mounted with network connections, and the desire to "connect it to the internet" combined with another request for a build-and-document a complete ICT bill acceptor project (pulsed, rather than serial) tells me something internetish will happen with somebody's money... or there is money to be made at the office coffee pot.
He also asked about the same board back in November, days after signing up to the forum, but blooped out the ESP8266, and went on to say:
"...we have no idea what is under the black marker..."
Are you here to help? Do you have anything positive to say?
And no, I will not make money from this. Im just trying to learn what so many others have already done with bill acceptor of other brands really different of the bill acceptor that I have at this moment.
Yes. Good luck with the coffee machine... and why did you gloss over my identification of parts that you "did not know" in November? Was that not enough help for you?
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You have a board that is not for sale
With a pprogrammable chip. You do not have the program, nor the specifications to rewrite the program.
The program might include secret codes (login, ID) that you will never get out.
Making a good PCB is not easy. How will you debug it if you do not know what it is supposed to do?
Cheapest option: buy a new coffee machine....
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