HP Scitex FB950 Printer series - Manual (Page 64)

4. Examine the X direction pattern (in the left-hand group of patterns) for the current head, and
determine which pattern of colored and black lines are the closest to perfectly aligned.
Use a printer’s loupe or magnifying glass (10x magnification or higher) if the patterns are difficult
to see.
Figure 4-3 Printhead X calibration patterns
5. Press the ▲ or ▼ control panel keys repeatedly until the number next to the pattern that is closest
to aligned perfectly is displayed.
For example, if pattern -1 is the closest aligned, press the ▼ key to change the display to:
X Direction Registration Head 2: -1
If a printhead is extremely out of alignment, there may be no pattern in alignment. Since the black
vertical bars are five pixels apart, you can add +5 or -5 to a pattern number to shift the colored bars
up or down by one black bar. Alternatively, you can repeatedly perform the X calibration, which will
move the head in smaller increments, until the head is aligned.
6. Press the Proceed ( ►) key.
The control panel message increments the head number by one.
7. Repeat steps 4 through 6 for each of the heads.
When you have entered registration values for all of the patterns, the control panel displays this
message:
Registration successful.
Manual Jet Mapping
Jets that are missing or misfiring are usually detected by the AutoJet calibration. Alternatively, you can
map out jets manually using the Manual Jet Mapping function. You may want to manually map weak or
misdirected jets that AutoJet does not substitute.
TIP: AutoJet is the automatic version of this calibration (see AutoJet on page 51 ).
TIP: For best results, print the prime bars and purge the printheads as necessary to ensure the
maximum number of working jets. See Check jet health on page 104 for instructions.
1. Press the Calibrate key from the Front Page screen, then press Manual Calibrations in the menu.
2. Press Manual Jet Mapping in the menu.
58 Chapter 4 Calibration ENWW