HP Designjet 5100 Printer series - Manual (Page 57)

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Maintain the ink system
HP Designjet 5100 printer Customer Reference Guide
from the front panel: select Internal RIP Settings > Align Calibration > Off.
The printhead alignment procedure requires an A1 or D-size paper size.
When the front panel displays Ready , you are ready to print.
NOTE: Make sure the printer window and the right-hand door are closed
after you replace the supplies. The printer will not print while these are open.