Brother HL-7050N - Manual (Page 42)

ABOUT THIS PRINTER 1 - 23
HL7050_US_UG_FM5.5
Tray ID setting (If the lower tray unit is installed)
If somebody moves the tray into another tray position and you print
the data without knowing this has been done, the driver finds the tray
and prints according to this setting.
Figure 1-12
Blue Tray ID