HP 1055CMHP - Manual (Page 97)

Service Tests and Utilities
4-23 HP DesignJets 1050C and 1055CM Printers Service Manual
3 After initialization, the test will start and the following message will
appear on the front panel:
WARNING In the following step, make sure you do not drop the piece of
paper inside the Drop Detector.
4 When the following message appears, open the Window and insert a
thin piece of paper inside the Drop Detector in order to block it.
Press any Front Panel key once the Drop Detector is blocked.
5 When the following message appears, remove the piece of paper
from inside the Drop Detector and close the Window. Press any
Front Panel key once the Window is closed.
6 The Printer will test the Drop Detector and the following message
will appear on the front panel:
DROP DETECTOR TEST
Detector Test...
Running Drop
and press a FP key
when it is blocked
Block the Drop Detector
paper
Drop Detector
Sensor
close the window
and press a FP key
to continue
Unblock Drop Detector
DROP DETECTOR TEST
Detector Test, ghost d
Running Drop