HP Designjet 4500 Printer series - Manual (Page 320)

To maintain optimum print quality, the printheads are automatically tested at regular intervals, and
automatically serviced if necessary. This takes a little time and will occasionally delay printing.
When a printhead eventually needs to be replaced, the front panel will tell you so.
CAUTION Whenever you buy a new printhead, you get a new printhead cleaner with it.
When you replace a printhead, always replace the printhead cleaner at the same time.
Leaving the old printhead cleaner in the printer will shorten the new printhead's life and
possibly damage the printer.
Printhead cleaners
Each printhead has its own printhead cleaner, so there are eight printhead cleaners in the printer.
Printhead cleaners are used to clean and maintain the printheads, to ensure the best possible print
quality, and to seal the printheads when they are not in use to prevent them from drying out.
CAUTION Whenever you buy a new printhead, you get a new printhead cleaner with it.
When you replace a printhead, always replace the printhead cleaner at the same time.
Leaving the old printhead cleaner in the printer will shorten the new printhead's life and
possibly damage the printer.
NOTE In some circumstances, the printer may ask you to replace a printhead cleaner even
though the corresponding printhead is not due for replacement. This is done in order to
maintain the printer's image quality and reliability.
Ink system tips
For best results, always follow these guidelines:
● Install the ink cartridges, printheads, and printhead cleaners before the install-by date, which is
printed on the packaging.
● Install a new printhead cleaner every time you install a new printhead.
● Follow the instructions on the front panel during installation.
● Allow the printer and printhead cleaners to clean the printheads automatically.
● Avoid unnecessary removal of the ink cartridges and printheads.
● The ink cartridges should never be removed while the printer is printing. They should be
removed only when the printer is ready for you to replace them. The front panel will guide you
through the removal and installation procedures (or see Remove an ink cartridge and Insert an
ink cartridge).
306 Chapter 26 Tell me about... (ink system topics) ENWW
Tell me about... (ink
system topics)