Cleaning The Print Head - NEC SuperScript 750C User Manual

When the printer is powered, the print head carriage will
automatically return to its rest position after 40 seconds
of inactivity.

Cleaning the Print Head

The print heads are cleaned automatically at regular
intervals while the printer is powered. This operation
clears the print head nozzles, guaranteeing the ink flow.
If you have a problem with the printing quality that is not
solved by this automatic nozzle clearing operation, you can
do the same operation, using:
a key combination:
WITH THE PRINTER COVER CLOSED , press and hold
ON LINE, press PAPER for at least two seconds and
then release both keys together.
the "CLEAN" function in the print care tab in the Printer
Monitor (see the specific section in User Interface ).
If you have a problem with the printing quality that is not
solved by the nozzle clearing operation described above, try
cleaning the print head, as follows:
1. Open the cover, release and remove the print head.
2. Clean the electrical contacts (gold part) on the print head
and in the housing on the print head carriage with a
slightly damp lint-free cloth, taking care not to touch the
print head nozzles.
3. Re-insert the print head in the printer and close the
cover.
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If there is still no improvement in the print quality, try
cleaning the print head nozzles.
This operation MUST NOT be repeated systematically, as
it can damage the print head. It should ONLY be
attempted as a last resort, before changing the ENTIRE
print head.
1. Open the cover, release and remove the print head.
2. Dampen a tissue handkerchief with distilled water;
squeeze it slightly to remove any excess water.
3. Holding the print head with its nozzles facing
downwards , blot it against the handkerchief, pressing
lightly.
4. Repeat the blotting operation a few times on different
areas of the handkerchief, to clean the nozzles.
5. Reinsert the print head in the printer and print the
"demo" page to check the quality of printing (see the
specific section in the Quick Start ).
For other problems, see the specific items in the
Troubleshooting Guide.
Ink Jet Print Heads - Cleaning the Print Head