This document is for the HP Photosmart Pro B9100 and B9180gp Photo printers.
The printout shows streaks or lines, perpendicular to the direction the paper moved through the printer. Streaking might display on the first few calibration pages printed during startup.
There are several possible causes for streaks and lines, including clogged printhead nozzles or scratched paper. Printing in high-speed modes can also cause streaks in areas of uniform black fill.
Figure : Examples of streaked printouts