Sharp UX-460 Operation Manual page 26

Loading Printing Paper
6
Your fax has been set at the factory to print at normal contrast.
Depending on the type of paper you have loaded, you may find that
you obtain better print quality by changing the setting to LIGHT.
Press these keys:
The display will show:
Press 1 to select NORMAL or 2 to select LIGHT.
The display will show:
Press the STOP key to return to the date and time display.
24
FUNCTION
6
PRINT CONTRAST
NORMAL
or
1
PAPER SIZE SET
STOP
LIGHT
2