HP 6840 HP Deskjet 6800 Printer series - (Macintosh OS X) User's Guide - Page 16
Automatic Paper-Type Sensor - printer scan
UPC - 829160429724
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HP Deskjet 6800 series printer User's Guide 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. 4.8 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. Note: The Automatic Paper-Type Sensor is not available for documents that are printed from the 250-Sheet Plain Paper Tray Accessory or the Auto TwoSided Print Accessory with Small Paper Tray. 16