Epson LX-300 printer prints only upper part of a word first and the other harf as the second line?

SOURCE: Epson LX-300+II, the font problem

have you check the white cable? (from the printer head to the
mainboard) .If the white cable is ok and you confirm that the 
printer head is fine, then the problem is at the mainboard.

most problems like this that i had encountered is at the transistor
at the mainboard. Try to check it out using a multitester.

SOURCE: Epson LX-300+ Matrix Printer Problem

Please change the setting print direction from bidirection to unidirection.

SOURCE: Epson LX-300+II, the font problem

yes you can change the font tray to print the printer internal setting tray that press and hold any key by tarn the printer off then on after you tarn the printer on release the key

SOURCE: Install the epson LX -300 printer

drivers para epson lx 300

SOURCE: Poor print quality of pdf documents on Epson LX-300

PDFs are designed to print using Postscript language.
The problem will occur with any non-Postscript printer. You can get better results on Windows printers by clicking on the "Advanced' button in the Print dialogue window. Then check 'Print as Image'.

This has worked well for me.