HP Deskjet 6122 Color Inkjet Printer - Manual (Page 23)

automatic paper-type sensor
The Automatic Paper-Type Sensor provides better printing results, particularly when
used with HP paper and media.
When the Automatic Paper-Type Sensor is engaged, the printer scans the first page of a
document with a blue optical sensor light to determine the best paper type setting. Once
determined, the page is printed.
For more information, see using the automatic paper type sensor .
The Automatic Paper-Type Sensor is not available to be used for
documents printed in Draft mode or from the 250-Sheet Plain Paper
Tray .
Caution! Do not place the printer in direct sunlight. Direct sunlight can
interfere with the Automatic Paper-Type Sensor.