Dell S320 User Manual page 62

buttons on the control panel simultaneously for 2 seconds. You can also
invoke the test pattern 2 by pressing and holding down
on the control panel simultaneously for 2 seconds.
Test Pattern 1:
Test Pattern 2:
F R
ACTORY ESET
default. The below warning message appears:
Reset items include both computer sources and Video source settings.
62 Using Your Projector
—Select and press to reset all settings to its factory
and buttons