Our factory have a EPSON dot matrix printer (Model Number is 630K), the user told me the printer printing "12345x @PJL ENTER LANGUAGE=ACL" about every five seconds.
It seems like installed wrong drivers, but when I tried to delete the printer from control panel, it was failed. And when I turned off the PC, the printer still printing by itself.
Finally, I fixed it by holding down the feed button then powering on the printer.
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