HP 72SR manual Press ! Proceed, Repeat steps 4 through 6 for each of the heads

Use a printer’s loupe or magnifying glass if the patterns are difficult to see.

+0 +1 +2

Fig. 4-1. Sample head calibration patterns.

In this example, pattern “+1” is aligned the closest,

so “+1” would be entered.

5.Press the , or ) control panel keys repeatedly until the num- ber 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 REG

HEAD-1 +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. Alter- natively, you can repeatedly perform the X calibration, which will move the head in smaller increments, until the head is aligned.

6.Press ! (Proceed).

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 pat- terns, the control panel displays this message:

Registration successful.

4-12 Manual Calibrations