HP Color Inkjet cp1160 Printer series - Manual (Page 111)

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replacing printheads
LCD panel messages
When a printhead fails, one of the following messages appears on the LCD
panel (ink levels may vary):
The printer will continue to print; however, the failed printhead may affect
print quality and speed. If several printheads fail, the printer may stop
printing.
If you notice poor print quality, but a printhead icon is not flashing, print a
Diagnostic Page to gauge printhead performance.
For instructions on printing a Diagnostic Page, see diagnostic page.