Epson C120A User Manual page 134

You see vertical banding or misalignment.
Make sure the print head nozzles are not clogged. To run a
cleaning cycle, see page 107.
Run the Print Head Alignment utility. See page 117 for
instructions.
Make sure the printable side of the paper is face up. It is
usually whiter or shinier.
Don't use the setting.
High Speed
Solving Problems
127