Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual page 106

EPSON Stylus COLOR 680/777/777i
1. Choose the "Bi-directional" in the "Adjustment main menu" as following figure.
Figure 5-9. Choose the Bi-d adjustment
2. Choose the "Print the Bi-d adjustment pattern" in the "Bi-Directional Adjustment
pattern" and click the "OK" button.
Adjustment
Figure 5-10. Bi-d adjustment pattern.
NOTE: As shown in the sample, gaps between passes are sometimes created in
different directions among patterns.
This unexpected change in direction is caused by an ink jet printer-
specific reason, which is an ink jet printer inevitably performs a
periodical cleaning specified by the flashing timer even during Bi-D
pattern printing, so that the printing direction suddenly changes.
Overview
Revision B
106