Epson STYLUS PHOTO R300 Series Operation Manual page 76

5. From the alignment pattern in set #1 on the printed test sheet,
choose the vertical line that is aligned best. Press the u or d
button to select the corresponding line number and press the
OK button.
6. Repeat step 5 for the alignment patterns in sets #2, #3 and #4.
7. Press the OK button to finish.
76