HP 750 - Manual (Page 114)

7-4 Calibrations C4705-90000
1C. Drop Detect Calibration
In this procedure the position of the drop detect sensor relative to the four print cartridges is
calibrated. Four values are calculated and stored in the EEROM.
Perform the drop detect calibration whenever the:
D EEROM is cleared.
D Main PCA is replaced without restoring the EEROM values.
D Cartridge checking algorithm continues to reject pens.
D Service station is replaced or disassembled.
D Drive roller assembly is replaced.
D Carriage is replaced.
You will also need to perform the drop detect calibration whenever these system errors
appear on the frontĆpanel display (details on error codes ' page 8Ć9):
D 070000H
D 070005, 6, 7 or 8
D 070010
D 070020
D 070030
The drop detect calibration is accessible through the Service Tests" submenu. Perform the
drop detect calibration as follows:
1 In the Service Tests submenu, scroll to 1C Drop Detect Cal" and press Enter.
2 The display shows the message Calibrating" indicating that the calibration is in
progress.
3 If the calibration passes, the Success Calibration / Press Enter" message is displayed on
the frontĆpanel. Press Enter to return to the Service Tests submenu.
4 If the calibration fails, an Error Code is displayed on the frontĆpanel.
If the calibration fails the test:
1 Perform the drop detector test ' page 8Ć37.
2 Replace the cartridges.
3 Perform the YĆstatic friction test ' page 8Ć46.