HP Color Inkjet cp1160 Printer series - Manual (Page 17)

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expired ink
The LCD panel indicates when an ink cartridge will expire soon or is expired.
For an explanation of ink expiration, see expired ink cartridges .
To see instructions for replacing an ink cartridge, see replacing ink
cartridges .
Will expire soon. Ink level may vary. Replace soon .
E xpired. Ink level may vary. Replace immediately.