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I am currently working on an Epson printer main board that exposes 5 aligned test pads (see image). The board also exposes a row of 4 pins that turned out to be UART. Now I am wondering if these could be some other standard way of interacting with components on the board such as JTAG. How can I find out what these pins are used for?

Epson board

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  • There are reverse engineering hardware like JTAGulator which can help to identify test pad points.
    – Robert
    Apr 10 at 14:44

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