HP Designjet 4000 Printer series - Manual (Page 108)

How do I remove a printhead?
Warning Make sure the printer wheels are locked (the brake lever is pressed
down) to prevent the printer from moving.
Printhead replacement must be performed with the printer switched on at the power
isolation switch.
1.
At the printer's front panel, select the icon, then Printheads > Replace
printheads now.
2. The printer moves the carriage into the correct position.
Caution If the carriage is left in the central part of the printer for more
than seven minutes. it will try to move back to its normal position in the
right-hand end.
3. When the carriage has stopped moving, the front panel will ask you to open the
window.
Chapter 6
106
How do
I
handle
the
ink
system?