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Ink Supplies Troubleshooting
HP Designjet 4000/4020 Printer Series Service Manual
Printheads
In order to increase printing speed, two Printheads are connected to each
Ink Cartridge, giving eight printheads in total.
The Printheads are extremely durable and do not need to be replaced every
time an Ink Cartridge is replaced. They are independent of the Ink
Cartridges and will continue giving excellent image quality results even if the
Ink Cartridges are low on ink.
If you notice a decline in print quality such as lines or dots missing from text/
graphics, go to Page 6-16, Troubleshooting Print Quality Problems.
Whenever a new Printhead is bought, it will come with a new
Printhead Cleaner. When a Printhead is replaced, the
Printhead Cleaner should be replaced 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.
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