Lexmark 2390 003 - B/W Dot-matrix Printer Service Manual page 80

7. Align the second and fourth lines to the first and third lines.
Each time Micro
toward the left. Each time Micro is pressed, the second and
fourth lines shift toward the right.
8. Continue adjusting the bidirectional alignment by repeating step
7, until your printout resembles the one shown.
9. When the bidirectional alignment is satisfactory, press Start/
Stop to exit the bidirectional alignment mode.
4-6
is pressed, the second and fourth lines shift