Scantron OpScan 4ES Operator's Manual page 55

Operator's Guide
3.
Ensure that the scanner is connected to the
computer via USB cable.
4.
Ensure that the input tray and output tray (or
Select Stacker) are in place and that the
adjustment bar is properly positioned for the
sheets being scanned.
Chapter 3: Operating Your Scanner
Verifying Proper Setup
35