Scantron OpScan 4ES Operator's Manual page 207

If you have:
No printing at all
Not used your printer for a
long time
Operator's Guide
Do the following:
Ensure that you have turned on the printer using
the background menu. Also, consult the
documentation that supports the software
application that you have installed on your
computer.
Replace the ink cartridge.
NOTE: If the scanner is not going to be used for
an extended period of time, remove the
cartridge from the scanner. Store the
cartridge in a sealed container, and place the
container in a cool, dry location, such as
inside a refrigerator.
Chapter : Transport Printer
Troubleshooting
187