HP Latex 3200 Users Guide - Page 393
Bands of light and dark zones
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Bands of light and dark zones These are periodic horizontal bands formed of a lighter band and a consecutive darker band. This pattern is mostly seen in solid color area fills (such as light purple or gray). There are three likely causes: ● Coalescence. This is due to an excessive amount of ink, and the ink being misplaced as it is deposited on the substrate, generating bands with more ink than other alternate bands. It can also be caused by firing too much ink in a short time. Coalescence is most likely to be seen in areas of high ink density. Here are some tips for solving this problem: - Use lower ink density. - Increase the number of passes. - Change the type of mask (Large mask / Uniformity). ● Printhead alignment. This is a clear contributor to banding. If printheads are not correctly aligned, the misplaced dots could correlate directly to the severity of the banding. To check printhead alignment, print the printhead alignment diagnostics plot (see Printhead alignment diagnostics plot on page 175). As a general rule, the biggest contributors to light-and-dark banding caused by printhead alignment are (in this order): ENWW Advanced print-quality troubleshooting 387
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