HP Designjet 4520 Printer series - Manual (Page 102)

5. When all cartridges have been inserted, close the door (push it until it clicks shut).
6. The front panel display confirms that all cartridges have been correctly inserted.
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 Printhead management > Replace
printheads.
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.
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