1、The paper size settings match on both the computer and the printer.

2、This issue happens randomly—sometimes on the very first page, and sometimes in the middle of a print job.

3、I have already replaced the pick-up roller, but the error persists. It still randomly prints blank pages and reports a paper size mismatch.

Now I heavily suspect it is an issue with the PE sensor (registration sensor) or its return spring. Any advice on how to clean or replace the sensor spring for Epson ET-3750?