Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 311)

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7. Check the printed patterns on the alignment sheet and select the following on the LCD screen,
depending on the alignment pattern you printed:
• Ruled Line Alignment : Select the number representing the pattern with the least amount of
separation or overlap.
Select the number representing the pattern with the least misaligned vertical line.
• Horizontal Alignment : Select the number representing the pattern with the least amount of
separation or overlap.