Print Quality Defect Locator Chart - Lexmark C77x Service Manual

Print quality defect locator chart

The print quality locator chart is attached to the back of this book, use the tables and rulers to determine the
source of repeating defects.
Using the charts
Measure repeating horizontal lines from the reference lines at the top to determine what may have caused the
lines to form in that pattern. Be sure to use portrait orientation for the test file.
Printing the chart from the user menu
The printer has an internal copy of the defect locator chart under the Help Menu.
At the Ready prompt:
1.
Press
1.
Select Help.
2.
Select Print Defects.
Printing Print Defects displays.
Verify the proper image size by measuring any of the marks on the chart and comparing them to the
corresponding measurement in the chart. Use Step 2 if adjustments are needed.
Print quality
For a transparency of the defect locator chart, go to the back of the hard copy service manual.
Note: If you want to copy the chart, then the following should be observed.
Since fax machines, digital scanners, and xerographic copiers can distort images, charts should be printed
using the PDF provided in back of this service manual. In order to maintain the accuracy of the edge rulers, the
following steps should be heeded when printing a copy of the Defect Location Chart.
1.
When printing this document, make sure "Fit the page" is NOT selected. This may distort the
measurements.
2.
Measure the distance between the reference line and the 110 mm calibration mark to verify that it is
correct. If the distance is inaccurate, the bottom registration margin setting can be adjusted to correct the
discrepancy. Increasing the bottom margin value stretches the image; reducing the bottom margin value
shrinks the image. Original margin settings should be noted in case these changes adversely affect the
print quality or registration when printing normal documents.
.
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Diagnostic aids