Scantron OpScan 4ES Operator's Manual page 219

Operator's Guide
3.
Check the scan path on the sheet. Make sure that
there are no stray marks, black marks or printing in
the scan path that leads to or from the bar code.
Bar Code
4.
Make certain that the read head, printer (optional),
and bar code reader covers are down and tightly
closed.
5.
Examine the bar code on the sheet you are trying
to scan. Make sure that:
• The bar code does not have any worn spots.
• The bar code appears to be printed correctly on
the sheet.
• The ink on the bar code is dark and consistent
across the code.
Chapter : Bar Code Reader
Scan Path
Timing Marks
Guide Edge
Troubleshooting
199