Scantron OpScan 4ES Operator's Manual page 157

Operator's Guide
3.
Press Change until Mode=ES/ScanMark appears in
the display.
4.
Press Next three times to get to the Background
Menu item.
5.
Press Exit to exit the background menu. The
scanner is now ready for operation in ES/ScanMark
mode.
Chapter 7: ES/ScanMark Emulation
Selecting ES/ScanMark Mode
137