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CAUTION The printer has an internal clock which allows it to wash the printheads automatically,
flushing some ink through the printhead, which keeps the printheads in good condition. This is
done after the first 20 hours without printing and every three days. If the printer is switched off for
a long period, this process does not happen. If the ink does not flow through the printheads from
time to time, the ink will dry inside the nozzles, reaching a point where it is impossible to recover
them and the printhead will fail. If the printer must be switched off for a long period of time, the
customer must use either the optional HP 790 Ink System Cleaning Kit or HP 790 Ink System
Storage Kit to recover or protect the printheads.
Automatic maintenance and cleaning will ONLY be performed when the printer is switched on
and powered up. If you switch it off on the front panel or with the power switch on the rear of the
printer this maintenance will NOT be performed.
Category Inspection/Maintenance
1 Daily inspection and maintenance Wiper blade and sponge cleaning
Capping unit cleaning
IQ print
2 Monthly inspection and maintenance Normal printhead recovery
3 To leave the printer for an extended
period in the power off state (more than
two weeks but less then four weeks)
Ink system storage
4 When returning the printer from an
extended period in the power off state
(more than two weeks but less then four
weeks)
Clean ink system
Charge the ink system after cleaning the
ink system
5 When returning to the printer after being
switched off for an extended period (less
than two weeks)
Clean ink system
Charge the ink system after cleaning the
ink system
6 To leave the printer in or return it from a
power off state of more than four weeks
Contact HP Support.
Daily printhead maintenance
WARNING! Failure to perform daily maintenance procedures may result in damage to your
printer printheads and will invalidate your warranty.
CAUTION If you need to leave the printer unattended for any reason, ensure that the printer
is on, the ink cartridges are full, and the waste ink bottle is empty, so that automatic
maintenance that is performed after the first 20 hours without printing and every three days can
be completed successfully for the time you are not present. If needed, install new ink cartridges.
The ink cartridges that you replace can be reused when you return to your printer, if they still
contain ink.
190 Chapter 6 How do I maintain the printer? ENWW
How do I maintain the printer?