Xerox WorkCentre Pro 423 Service Manual page 252

WorkCentre Pro 423/428
Image Quality
Test Pattern
Problem
Deletion Grid (4-Bit)
(Image with [23-13]
deletion)
Jitter Grid (4-Bit)
(Blurred images) [23-13]
l Continuous
Banding
(Vertical stripes of gradation
0.5mm pitches in [23-8]
l Continuous
the transverse
direction to the gradation
copy fed direction) [23-9]
Other Grid (4-Bit)
23-13]
How to identify the problem area
When the defect is generated to the specific Test
Pattern, the IOT control board may have the
problem, and when it is not, the IIT board may
have the problem. Perform an appropriate
troubleshooting by referring to 3.3.5 Corrective
action against image quality problems.
Perform an appropriate troubleshooting by
referring to 3.3.5 Corrective action against image
quality problems.
Check with the Test Pattern.
Check with the Test Pattern.
3-8 CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING
3.2 Image Quality Specifications