Kodak VERSAMARK DP7122, Operator'S Manual

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Chapter 3. Troubleshooting
Identifying Print Defects
Identifying Print Defects
This section describes and illustrates the following types of problems
encountered with 7122 printheads:
• Buildup and Contamination
• Voltage Defects
• Phase Defect
• Setup Errors
• Miscellaneous Problems.
The procedures described should be performed only by an operator or
service technician trained by Kodak Versamark, Inc.
Defect groups are not absolute. Different problems can produce similar
defects, and more than one print defect can be present at the same time.
The groups are intended to provide general guidelines for identifying the
cause of a given defect.
All print defects are shown using the standard test pattern and test image
printed by the 7122 as described in “Printing Test Patterns”.
Run test patterns and compare them to the sample defects shown in this
section to identify a problem, then take the recommended actions. Figure
3.1 shows a good test pattern.
Figure 3.1 Good test pattern
Look for dark defect here
Look for pickout here