HP Deskjet 6122 Color Inkjet Printer - Manual (Page 61)

If Automatic is selected as the paper tray, verify that the upper tray contains
paper. If the upper tray is empty, the Automatic Paper-Type Sensor is not
operational for that print job.
turning off the automatic paper-type sensor
Open the Print dialog box and choose the following settings:
panel setting
Paper Type/Quality
Paper Type: Any setting other than
Automatic
—or—
Quality: Draft
—or—
Source: Lower Tray
For a description of available print options, click the
appropriate operating system: Mac OS 8.6, 9.x, or X Classic
or Mac OS X .