Pro 7900 and 9900 Field Repair Guide 10/6/10
Glossary Printer Component, Software Item, LCD Display, Printer Button Page 426.
Horizontal Banding: An image defect that extends from the left, to the right margin (parallel to the direction
of print head movement). The defect could be a lighter or darker “band” than is
intended. It usually repeats, with the same interval, from the top margin to the bot-
tom.) Horizontal banding is caused by vertical dot placement errors (print head or
paper feed related).
Horizontal Over-lap: A type of horizontal banding, where multiple print head passes overlap while printing.
The banding looks darker than the intended image. Multiple passes of the print head
should place ink on the paper next to, but not on top of earlier passes.
Horizontal Under-lap: A type of horizontal banding, where multiple print head passes have a space
between them. The banding looks lighter than the intended image. Multiple passes of
the print head should place ink on the paper exactly next to earlier passes with no
space in between.
Illusion of Continuous Tone. A term that refers to “fooling” the human eye into perceiving a dot matrix image as a
photograph (continuous tone image). Epson ink jet printers are not continuous tone
printers. However, when working properly, their printed images fool the human eye
into seeing continuous tone transitions
Ink Color Contamination: The intended color of the ink supply has been altered.
Ink Impurities: Foreign objects in the ink supply.
Leading Edge The first part of the media to leave the printer.
Margin Shift: A term that refers to an image with irregular right and left side margins.
Mechanical Alignments: Printer adjustments, that requires physically moving parts of the mechanism.
Media: The surface that is being printed on, usually paper.
Metamerism: The different appearance of colors caused by different light sources and viewing
angles
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