Xerox WorkCentre Pro 423, Service Manual

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03/02 Contents
WorkCentre Pro 423/428 3-1 CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING
Contents
3.1 Introduction............................................................................................ 2
3.1.1 Chapter 3 Composition and Distinction ...............................................................2
3.1.2 How to Use the Image Troubleshooting ..............................................................2
3.2 Image Quality Specifications.................................................................. 3
3.2.1 Test Pattern Types ..............................................................................................3
3.2.2 How to Use the Test Pattern ...............................................................................3
3.2.3 Built-in Test Pattern .............................................................................................6
3.3 Image Quality Troubleshooting .............................................................. 9
3.3.1 Copy Sample ......................................................................................................9
3.3.2 Cautions on image quality troubleshooting .........................................................9
3.3.3 Basic rules on action against image quality problems.........................................9
3.3.4 Image Quality Adjustment ...................................................................................9
3.3.5 Corrective action against image quality problems............................................. 11
C - 1 Too light copies ............................................................................................... 11
C - 2 White copies ...................................................................................................12
C - 3 White off: Copy sample ...................................................................................13
C - 4 White off: Copy sample ...................................................................................13
C - 5 White off Copy sample ....................................................................................14
C - 6 Spot white off Copy sample.............................................................................15
C - 7 Black lines Copy sample .................................................................................15
C - 8 Black lines Copy sample .................................................................................16
C - 9 Black spots Copy sample ................................................................................16
C - 10 Belt high-background Copy sample .............................................................17
C - 11 Belt high-background Copy sample .............................................................17
C - 12 High background Copy sample ....................................................................18
C - 13 Solid black copies ........................................................................................18
C - 14 Skip ..............................................................................................................19
C - 15 Smear Copy sample ....................................................................................20
C - 16 Jitter/Data error Copy sample ......................................................................20
C - 17 Distortion (Hunting) Copy sample ................................................................21
C - 18 Banding Copy sample ..................................................................................21
C - 19 Magnification failure Copy sample ...............................................................22
C - 20 Poor resolution.............................................................................................22
C - 21 Residual image (ghost) ................................................................................23
C - 22 Finger Mark..................................................................................................23
C - 23 Moiré ............................................................................................................24
C - 24 Poor fusing...................................................................................................24
C - 25 Poor registration: Copy sample....................................................................25
C - 26 Uneven density: Copy sample .....................................................................26
C - 27 Wrinkle in copies..........................................................................................26
C - 28 Skew............................................................................................................ 27
C - 29 Black bands ................................................................................................. 28
C - 30 Dark copies.................................................................................................. 28