Epson ActionLaser 1600 Reference Manual page 118

To print a RITech test pattern:
1. Enter SelecType by pressing the Menu button.
2. Press the Menu button several times until TEST MENU
appears on the display.
3. Press the Item button until RITech TEST PRINT appears on
the display.
4. Press the Enter button once. The printer prints a check
pattern.
The check pattern is a rectangle with a pattern inside it, as
shown below. When the RITech setting is best, you cannot
see the pattern inside the rectangle.
If the check pattern is out of adjustment, change the RITech
setting or turn it off to improve print quality.
6-22 Troubleshooting and Maintenance
STILL NEED ILLUSTRATION
Out of adjustment Optimal setting