3.7 Ink-backup mode
In the ink-backup mode, the printer operates by using only one print cartridge. The
ink back-up mode is initiated when a print cartridge is removed from the print
cartridge cradle.
To remove a print cartridge, see the print cartridge installation page.
Ink-backup mode output
Printing in ink-backup mode slows the printer and affects the quality of printed
documents.
Installed print cartridge Result
Black print cartridge. Colors are printed as grayscale.
Tri-color print cartridge. Colors print but black is grayed and is not a true black.
Photo print cartridge. Colors are printed as grayscale.
Gray photo print cartridge. Colors are printed as grayscale.
Note: It is recommended that you do not use the photo print cartridge or the gray
photo print cartridge for ink-backup mode.
Exiting ink-backup mode
Install two print cartridges in the printer to exit the ink-backup mode.
To install a print cartridge, see the print cartridge installation page.
3.8 Automatic Paper-Type Sensor
The Automatic Paper-Type Sensor automatically selects the appropriate print
settings for the media that is being printed on, particularly HP media.
When the Automatic Paper-Type Sensor is engaged, the printer scans the first page
of a document with a red optical sensor light to determine the best paper-type
setting. After the printer determines the paper-type setting, the page is printed.
Do not place the printer in direct sunlight. Direct sunlight can interfere with the
Automatic Paper-Type Sensor.
To use the Automatic Paper-Type Sensor, see the paper-type selection page.
HP Deskjet 6600 series printer
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