Xerox WorkCentre 490cx User Manual page 250

Color all-in-one
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Examine the test pattern. The example below shows a test pattern of all
nozzles functioning correctly on the color and black ink cartridges.
Compare the diagonal same-color lines at the top and bottom of the test
pattern. Look for a break in the diagonal lines; a broken line shows any
clogged nozzles.
8-12
Maintenance

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