HP 400 - Manual (Page 95)

5-32 Problem Resolution
3. Once the print cartridge and print cartridge cradle contacts
are dry, reinstall the print cartridge. Retest by printing the
printer self-test.
– If all of the rows of dots are printing, no further
troubleshooting is necessary.
– If rows of dots are still missing in the self-test printout,
continue on to the next step.
4. The print cartridge may be faulty. Replace the print
cartridge and retest by printing the printer self-test.
– If all of the rows of dots are printing, no further
troubleshooting is necessary.
– If rows of dots are still missing in the self-test printout,
the print cartridge nozzles may be clogged, continue
on to the next step.
5. Hold the print cartridge so that the gold rectangle, in the
middle of the raised end, points up. Place two drops of
clean water on the gold rectangle (shaded below).
6. After 60 seconds, gently remove the water with a lint-free
damp cloth.
.
7. Repeat the above steps of installing the print cartridge,
cleaning the print cartridge contacts, cleaning the print
cartridge cradle contacts, and clearing the nozzles several
times. If the problem consistently appears in the printer
self-test with the same rows of dots missing on different
print cartridges, return the printer for repair.