HP Color Inkjet cp1160 Printer series - Manual (Page 94)

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overriding the ink level gauge
Overriding the Ink Level Gauge disables the printer’s ink level tracking
feature.
Caution! If you use the override sequence described below, you will
disable the Ink Level Gauge for your ink cartridge. If you choose to
continue printing with an ink cartridge that has had its Ink Level
Gauge disabled, you may not know when the cartridge is running
low or empty. Printing with an empty cartridge may seriously
damage your printheads. Damage that results from continued use of
an ink cartridge with a disabled Ink Level Gauge is not the
responsibility of HP. Damage that results from the use of non-HP ink
is not the responsibility of HP.
The Ink Level Gauge automatically resets when a different ink cartridge is
installed in the printer.
Overriding the Ink Level Gauge does not affect ink cartridge expiration
dates. The printer cannot use an expired ink cartridge.