Xerox WorkCentre Pro 423 - Page 247

3.2 Image Quality Specifications
WorkCentre Pro 423/428 3-3 CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING
3.2 Image Quality Specifications
3.2.1 Test Pattern Types
The following three types of Test Patterns are used for DocuCentre 230/280:
l 499T247 A3 Test Pattern (Fig.1)
l 499T281 Fax Test Pattern (Fig.2)
l Built-in Test Pattern (This Test Pattern is stored in the memory and used for identifying
problem causes for boards)
3.2.2 How to Use the Test Pattern
Note For specifications, refer to Section 6 Specifications.
To check copy quality, use A3 Test Pattern (499T247). For checking image quality when
the DADF is used or send/receive using fax features, use fax Test Pattern (499T281). Fax
Test Pattern (499T281) is a chart having A4 LEF and B4 SEF lead edges and is used
according to the document size. Use the ordinary paper for checking image quality.
A. Magnification
Terminology description
Indicates the vertical and horizontal enlargement or reduction percentages against
the original. Matching to the selected magnification is specified.
Judgment procedure:
l 499T247
Compare distance between two target positions on a copy to that on the Test
Pattern.
l 499T281
Make a copy using the DADF and compare distance between two target positions
on a copy to that on the Test Pattern.
B. Skip and Smear
Terminology description:
Represents missing images in the copy feed and transverse directions. Degree of
missing images is specified.
Judgment procedure:
Make a copy of Test Pattern (499T247) and observe the ladder.
C. Resolution
Terminology description:
Represents how fine the original images can be reproduced and the degree is
specified. Resolution 4.3 indicates that each line is reproduced independently
when 4.3 lines are drawn within 1 mm at equal intervals.
Judgment procedure:
Make a copy of Test Pattern (499T247) and observe resolution at three target areas
(or two targets for enlarged copies).
D. Legibility
Terminology description:
The character reproducing level of a document send/received using the fax feature
is specified.
Judgment procedure:
Conduct send/receive using Test Pattern (499T281) and observe character patterns
at two areas.