HP Color Inkjet cp1160 Printer series - Manual (Page 143)

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problems with the automatic paper-type sensor
The Automatic Paper-Type Sensor scans each sheet of paper before printing
and determines the best print setting. Several factors can affect the Automatic
Paper-Type Sensor and reduce print quality.
check the paper
If you are using the Automatic Paper-Type Sensor, verify that the paper is
not wrinkled or scratched. Replace the paper if it is damaged.
turn off the automatic paper sensor
If the print quality does not improve, turn off the Automatic Paper-Type
Sensor.
For instructions on turning off the Automatic Paper-Type Sensor, see
turning off the automatic paper-type sensor .
a printhead may be failing
A failing, but usable, printhead may cause poor print quality. Print a
Diagnostic Page to see if a printhead needs to be replaced.
For instructions on printing a Diagnostic Page, see diagnostic page.