PG-M20X (serv.man36). Intermittent start-up shut down (locks up) - Sharp Projector Technical Bulletin (repair manual). Page 10

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(2) From the menu, select the “Set-up” and then “Serial port”.

And change “Port” to COM Port number you wrote down in the previous step (2-
4(6)).

(3)  Type only ENTER Key and check the following screen.

The Tera Term Pro shows the “ERR”.

If “ERR” does not appear, check USB cable and COM port number in the
previous step (3-2(2)).
Or disconnect the USB cable, and then restart PC, and then connect the USB
cable, and take the steps again from the previous step 3-2(1).