Printing Direction; Uni-Direction; Bi-Direction - Roland SP-300 Service Manual Book

Printing Theory
Printing Theory

• Printing Direction

1. Uni-direction

Head Carriage moves in one way to print.
Printing quality is higher because the first pass of dots have
enough time to dry up before the second pass of dots are fired,
which prevents dots to be mixed.

2. Bi-direction

Head Carriage moves in both ways to print.
Printing quality is not so good as uni-direction because the
color order will be reversed and dots could be mixed to each
other by printing the second pass before the first pass dries up.