NEC SuperScript 100C User Manual page 46

Print Head Care in Chapter 2).
If none of these operations result in improved print quality, you must replace the
print head.
Printing
During a printing operation, do not stop the print head manually nor touch the
area within the print head carriage path.
1. Printer does not print/receive data.
Check that the printer is connected to the electrical power supply and On Line
(the Power and On Line LED's on the operator panel should be lit).
Check the physical (cables) and logical (application and driver) connections
between the printer and host.
Check that host system is switched on.
If the print head carriage does not move and the Power and On Line LED's flash
rapidly, disconnect and reconnect the printer to the electrical power supply.
If the Power and On Line LED's continue to flash rapidly, call the Technical
Assistance Service.
Check that you have removed the protective film from the print head.
If the Power and On Line LED's flash slowly, check that paper is present and
that it loads correctly, then press Install Cartridge.