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Print Quality Issue Examples (including possible causes and solutions)

The Memjet printhead cartridge contains 70,400 inkjet nozzles. These nozzles are divided into ten rows; two rows of nozzles for each color channel. Due to the high number of nozzles; it is not uncommon for some nozzles to become contaminated, dehydrated or clogged.

The following examples were produced using a Five Band Color Purge YKCKM. A similar purge pattern can be performed using the “Print Ink Channels” button; located in the Toolbox, Diagnostics Menu.

Air in Printhead Nozzle Area: Air in the printhead nozzles will show as jagged, irregular shaped lines of missing color. Lines are normally wider than one nozzle.

Possible Solutions:

Clogged/Damaged/Dead Nozzles:

Clogged/damaged/dead/ nozzles will normally show as thin, crisp, vertical lines of missing color. Multiple adjacent nozzles, with same issue, will show as wider, crisp, vertical lines of missing color. Clogged nozzles are normally due to Printhead nozzle dehydration or partial contamination. Damaged nozzles are normally due to improper cleaning or debris on wiper roller causing damage to head. Dead nozzles are normally due to the nozzle reaching its “end of life” (~50,000,000 ejections).

Possible Solutions:

Color Mixing Issues:

Color mixing will show as muddy, mottled or distorted (grainy) colors. Color mixing occurs when the ink from one color channel crosses over into another color channel. Since the inkjet nozzle rows are located very close to one another (ten rows of 7,040 nozzles, located within a 0.8 mm space), it is easy for partials or fibers to create bridges across color channels. These bridges allow ink to flow (wick) from one color channel to another; resulting in a “localized” color mixing event; as shown in the examples below.

Color mixing can occur for a number of reasons (here are some common ones)

Possible Solutions: