HP 220 - Manual (Page 173)

8Ć25 Removal and Replacement C3187Ć90000
Interpreting the Service Configuration Plot
AnalyzinN the Bar Pattern
The configuration plot has special builtĆin diagnostic features. It includes seven bars printed
along the top that enable you to detect printĆquality problems.
First Four Bars
Use the first four bars (from left to right) to detect
D Problems with nozzle firing direction
D Missing nozzles
These bars are a series of straight horizontal lines, four pixels apart. Different nozzles are
used to create each of the four bars.
Use a 10X magnifier to look at the patterns. Perfect patterns should be parallel lines equally
spaced. Some slight errors in direction (meaning the ink dots are not being fired straight) are
due to nozzle imperfections and cannot be fixed. Others may be caused by nozzle
contamination. You can sometimes correct these by cleaning the nozzles (D User's Guide).
Fifth and Sixth Bars
Use the fifth and sixth bars to detect
D Banding
D Problems with nozzle firing direction
D Misalignment between the cartridges
In the following two diagrams, F denotes a dot and f denotes a white space.
The fifth bar is a 25% area fill pattern that looks as follows,
FfFfFfFfFfFfF
fffffffffffff
FfFfFfFfFfFfF
The sixth bar is also a 25% area fill pattern that looks as follows:
FfFfFfFfFfFfF
fffffffffffff
fFfFfFfFfFfFf
These bars should look solid gray.
Seventh Bar
Use the seventh bar to detect misalignment between the cartridges.
This bar is a series of vertical lines, 8 pixels apart. The lines should be straight with a
deviation of no more than 2 mils.