HP Designjet 4500 Series - User Guide

7. To remove a printhead, lift up the blue handle.
8. Using the blue handle, gently disengage the printhead.
9. Gently pull the blue handle upward until the printhead is released from the carriage.
CAUTION Do not pull abruptly because this can damage the printhead.
10. The front panel display identifies the missing printhead.
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