HP 0706124 REV B manual Printer prints the calibration pattern you selected

10.Press ￿ (Proceed).

The printer prints the calibration pattern you selected.

11.When the calibration page has printed, the control panel dis- plays this prompt:

Bidi registration

Head 1: 0

12.Examine the BiDi Registration pattern for the current head, and determine which pattern is the closest to perfectly aligned.

Use a printer’s loupe to select the pattern, since the lines in the patterns may be difficult to discern.

+6 +4 +2 0 -2

Fig. 4-18. BiDi Registration pattern.

13.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 +2.0 is the closest aligned, press the ￿ key to change the display to:

HEAD-1 +2.0

If a printhead is extremely out of alignment, there may be no pattern in alignment. Since the black vertical bars are nominally five pixels apart, you can add +5 or -5 to a pattern number to shift the colored bars right or left by one black bar. Alternatively, you can perform the BiDi Registration repeatedly, which will move the head in smaller increments, until the head is aligned.

14.Press ￿ (Proceed).

The control panel message increments the head number by one.

4-8 Manual Calibrations