HP Color Inkjet cp1160 Printer series - Manual (Page 125)

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print quality
Follow these steps if one or more of the Color Blocks is not solid:
1. Load clean, plain white paper in the paper tray.
Using paper with printing on either side will undermine the cleaning
process.
2. Open the Toolbox .
3. Click Clean the Printheads , then follow the onscreen instructions.
If one of the printheads has failed, the printhead icon flashes on the LCD
panel. Replace the printhead. To reset the LCD panel, turn the printer off,
then turn it back on.
For instructions on replacing a printhead, see replacing printheads .
disabled printheads
When a printhead has failed and shows a status of Replace Now, one or
more of the other printheads may have a status of Disabled. The Disabled
status is temporary.
Once the failed printhead is replaced, the disabled printheads will operate
and have a status of OK.
Do not replace a printhead with a status of Disabled. Only replace a
printhead with the status of Replace Now.