Scantron OpScan 4ES Operator's Manual page 26

Chapter 1: Scanner Basics
Scanner Components
Component
Bar code
reader
(optional)
Transport
printer
(optional)
Select Stacker
(optional)
Tray lock
6
Reads bar codes on a sheet. The cover of the reader must
be down and latched for the scanner to function properly.
Prints data on a sheet sent from an attached computer. The
printer cover must be down and latched for the scanner to
function properly.
Enables the computer to select between two trays for
sheet output. The Select Stacker places sheets in the
bottom (select) tray based on edit criteria selected in your
scanning software.
Locks the input tray in the down position for easier loading
of sheets. The input tray lever releases the tray lock. The
input tray must be up for the scanner to function properly.
Function
Scantron OpScan 4ES and NSIGHT 4ES Scanners