Kodak VERSAMARK DP5120, Installation Manual

Page: 70 / 82

6-6 DP5000 Series Printers
Chapter 6. Testing
Printhead Adjustment
Printhead Adjustment
Use the procedures in this section to adjust the printhead if the print
quality of the test patterns initially produced by the printer are not
acceptable.
Note: Always print the first test patterns using the factory phase and voltage
settings. Adjustments should be made only after print defects are
observed in the test patterns.
Phase Adjustment
Phase adjustment defines the phase “window” that produces optimum
print quality. The phase window is a range of voltage values. Use test
patterns to check the changes in print quality produced by phase window
adjustments. Use these adjustments to calculate the phase window that
produces the best print quality.
Apply the following guidelines to phase adjustment:
• A voltage setting that is out of the print window range can affect the
phase window.
• A phase setting that is near the edge of the phase window range can
affect the print window.
• Print speed may also affect the print window. Use 400 fpm (122 mpm)
as the standard print speed for print window evaluation.
Use the following procedure to establish the phase window:
1. Enter Diagnostics.
2. Select Mode
→
Settings
→
Printer Setup .
3. Check the printhead height, phase and voltage settings.
a. Use typical settings to print test images, such as height 0.10 in,
15 phase and 140 volts for DP5120.
4. Print test images.
5. Examine the test patterns for defects.
a. If the test pattern is normal, go to step 7.
b. If missing spots or bands of print occur (Figure 6.1 ), go to step 6.
Figure 6.1 Missing spots or bands of print