HP Color Inkjet cp1160 Printer series - Manual (Page 121)

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diagnostic page
The Diagnostic Page provides detailed information concerning the status of
the ink cartridges and printheads.
Print a Diagnostic Page when you:
• Encounter print quality problems
• Want to view information about printheads and ink cartridges
• Want to check ink levels
• Want to see the printer serial number
• Plan to call HP Services and Support (if possible)