HP 400 - Manual (Page 84)

Problem Resolution 5-21
The print cartridge packaging
seal was broken too soon The print cartridge has a longer life sealed in its packaging rather than in the
printer. Keep print cartridges sealed in their packaging until needed. Then, install
the print cartridge in the printer promptly. If you use both a black and a color print
cartridge, keep one print cartridge in the printer and the other in the storage
container provided with the optional Color Kit.
The estimate of the number of pages
actually printed was inaccurate Underestimating the number of pages actually printed is hard to avoid. When
counting pages per cartridge, be sure to count drafts that have been thrown away.
The print cartridge was faulty If a print cartridge proves to be faulty, replace it. If a pattern of faulty print
cartridges develops, it is possible that a problem in the printer itself may be
causing the print cartridges to fail. In this case, return the printer with the failed
print cartridges for evaluation and repair.
There may be a printer hardware
problem The service station may be faulty, or the printer may be damaging the print
cartridges. Return the printer with the failed print cartridges for repair.
The print cartridge cleaning routine
was used excessively The cleaning routine clears the ink nozzles and — if used in the appropriate
circumstances — can have the effect of restoring a print cartridge. However,
using this routine too frequently consumes significant quantities of ink. Avoid
overusing the cleaning routine.
Table 5-8. Possible Causes for Short Print Cartridge Life — Black or Color (Continued)
Possible Cause Explanation