HP Designjet Z3100 Photo Printer series - Manual (Page 135)

10. Pull the blue handle upward until the printhead is released from the carriage.
CAUTION: Do not pull abruptly because this can damage the printhead.
11. The front-panel display identifies the missing printhead.
Insert a printhead
1. If the printhead is new, shake the printhead vigorously before removing the protective caps.
2. Remove the orange protective caps by pulling them down.
ENWW Insert a printhead 125
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