HP Latex 3200 Users Guide - Page 400

Possible causes ● Uniform variations from tile to tile. When color changes uniformly it must be within the color consistency specification; see Color consistency on page 41 for more details. Usually grays are much more sensitive: differences of much less than 2 dE 2000 may be visible, although other colors would not show a difference. ● Small color variation left to right. The tile itself looks uniform, but when putting it beside the adjacent tile the differences become visible. ● Local color variations. See Local color variations on page 393. Sometimes these defects become visible only when printing tiles, showing in one of the tiles but not in the adjacent. They are also more visible when printing grays. Possible solutions ● Try to ensure uniform printing of all tiles, and all tiles printed in the same run. ● Rotate every other tile, to compensate for left to right differences. ● Adding color bars at both sides of the image helps overall, especially when there are local color variations. Edge roughness, text quality The edges of objects may appear rough or blurred; this is especially noticeable in text. There are five possible causes: ● Bleed: see Bleed, halo, wicking on page 392. ● Printhead alignment. As each ink is deposited by two printheads of the same color, it is important that the two printheads are correctly aligned. When a color is formed by a combination of inks, which is often the case, it is also important that printheads of different colors are correctly aligned. To check printhead alignment, print the printhead alignment diagnostics plot (see Printhead alignment diagnostics plot on page 175), and fine-tune the alignment by identifiying the offenders in the plot. ● Substrate advance. Before trying to adjust any parameter, make the following checks: 394 Chapter 11 Troubleshoot print-quality issues ENWW