the arm will swing to open the area that is normally closed and will block the path of the switch. meaning the switch is not detecting the normal blocked state by the arm. When it swings the hall effect switch is open. One end goes to the main circuit board and controls a hall effect switch, the other end goes to the middle of the paper feed area and has a thin arm that sticks in between the rollers and it swings when paper is fed past it. The sensor works off of a small black or brown piece of plastic that runs across the back of the roller assembly that catches the edge of the paper to get it started into the carriage area. they have not allowed enough material to hold the paper jam detector in the correct position. it's a simple fix and it's due to epson's poor design. i also took pictures of the area that needs attention. i took it apart and found out exactly what is going on with these printers. Epson xp300 paper jam every time even with no paper.
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