HP Scitex FB950 Printer series - Manual (Page 60)

Manual calibrations
When you run the calibrations from this menu, you evaluate the calibration test patterns visually and
enter the calibration values via the control panel.
▲ Press the Calibrate key from the Front Page screen, then press Manual Calibrations in the menu.
The Manual Calibration menu consists of these options:
● Media Feed Calibration — calibrates the media advance accuracy for band-free printing.
Visual and (for rigid media only) camera-assisted calibrations are available.
● Manual BiDi Registration — the manual version of AutoBiDi Calibration.
●
Printhead X Calibration — the manual version of AutoH2H Calibration.
●
Manual Jet Mapping — the manual version of AutoJet.
● Print Jet-Out Lines — prints a version of the Prime Bars in which missing jets that are replaced
are marked with a black square.
● Default Registration Data — sets all registration data to zero.
After calibration and jet mapping, perform a linearization or color calibration (as supported by the
RIP). See
Linearization on page 63 .
NOTE: The manual BiDi and X head calibrations are time-consuming and can be error-prone, but is
necessary when calibrating transparent media or other media that the printer’s digital image sensor
cannot calibrate.
Media Feed Calibration
This calibration allows you to calibrate the accuracy of the media advance. Inaccurate media advance
can result in blank spaces between print swaths (too much advance) or overlapping swaths (too little
advance). The Media Wizard stores this value by media type, and displays a media feed number (MFN),
which you can record for subsequent entry.
The media feed number enables you to quickly specify a known good media feed setting without
recalibration. For example, you could keep a list of media feed numbers by media type, or by media
type and full, half, and nearly empty supply rolls.
1. On the Manual Calibrations menu, highlight Media Feed.
2. Press the Menu In key to select the option.
You can calibrate the media feed using the printer's image sensor or a metal ruler. The image-
sensor based calibrations (sheet-fed media only) print a reference pattern, eject the media, and
prompt you to rotate and reload the media so the pattern can be measured. To account for the
slight variability in the media feed mechanism, repeat these calibrations three to five times to obtain
the best calibration. The software allows you to position the patterns anywhere on the sheet so you
can print multiple iterations on the same sheet. The ruler-based calibrations are recommended
only for gross adjustments before using the image sensor.
990 mm (39 in) calibration — sheet fed only, uses the printer's onboard image sensor for precise
adjustments. If the media feed needs larger adjustments, use the ruler-measured calibrations first.
Use for maximum accuracy.
54 Chapter 4 Calibration ENWW