HP OFFICEJET 4500 - Manual (Page 87)

To prevent problems causing ragged bars on the PQ Diagnostic Report, try the
following solutions:
•
Avoid leaving un-taped ink cartridges outside of the printer for an extended
period of time. For more information about handling ink cartridges, see Handle
the ink cartridges.
•
Always turn off the product using the (Power) button, which prevents air
from getting into the cartridges. For more information about turning off the
product, see Turn off the device.
Regular white streaks in the bars
Example of bad color bars: The blue bar has regular white streaks.
Bar colors are not uniform
Example of Bad Color Bars: The yellow bar is streaked with another color.
c. Large-font text: Look at the large-font text above the color blocks. The type
should be sharp and clear.
Example of good large-font text
The letters are sharp and clear - the printer is operating correctly.
Poor print quality and unexpected printouts 83