Xerox WorkCentre 5687 Series Service Manual page 995

Table 1 Image quality defects
Image quality
defect Description of defect
Spots Dark spots in the non-image areas of the print.
Streaks Lines on the print, in the process direction of the non-image
area.
Stretched and The image on the paper is stretched or distorted.
distorted
images
Toner contami- Random black spots or marks
nation on the
back of prints
Uneven den- Variation in image density across the print. See also non uni-
sity formity.
Unfused prints The toner image on the finished print is not fused to the print
medium.
Table 2 Internal test patterns
Number Description
1 Blank sheet, Figure 2.
2 75 dpi, 0 degrees 25% area cover-
age halftone. Figure 3.
3 106 dpi, 45 degrees, 25% area cov-
erage halftone. Figure 3.
4 212 dpi, 45 degrees, 25% area cov-
erage halftone. Figure 3.
5 106 dpi, 45 degrees, 50% area cov-
erage halftone. Figure 4.
6 212 dpi, 45 degrees, 50% halftone.
Figure 4.
7 424 dpi, 45 degrees, 50% halftone.
Figure 4.
8 Perpendicular lines 2 on 2 off. Figure
5.
9 Perpendicular lines 8 on 56 off. Fig-
ure 7.
10 Parallel lines 8 on 56 off. Figure 6.
11 Combined grey scales. Figure 8.
WorkCentre 5687 Family
Optimum
internal test
pattern
1, 2
2, 5
16
2
5
14
Purpose
0% area coverage. Background defects
spots, scratches.
Light density uniformity, deletions, lines,
bands, streaks and photoreceptor defects.
Light density uniformity, deletions, lines,
bands and streaks.
Reserved for engineering investigations.
Stress test pattern. Will not be defect free.
Uniformity, fuser defects, lines, bands,
streaks and smears.
Reserved for engineering investigations.
Stress test pattern. Will not be defect free.
Reserved for engineering investigations.
Stress test pattern. Will not be defect free.
Motion quality. ROS, developer, registration
transport, fuser and intermediate gear trains.
Reserved for engineering investigations.
Stress test pattern. Will not be defect free.
Lines that run LE to TE.
This test pattern is only for engineering
development.
August 2007
Table 2 Internal test patterns
Number Description
12 Perpendicular bands. 25 mm (1 inch)
on and 25 mm (1 inch) off black. Fig-
ure 9.
.
13 Perpendicular lines 2 on 30 off. Fig-
ure 10.
14 12cm. (4.75 inches) Lead edge black
band. Figure 11.
15 Tone reproduction curve. Step-
wedge 106 dpi, 45 degrees. Figure
12.
16 Quadrille 4 on 60 off. Figure 13.
17 Ladder chart. Figure 14.
18 Manufacturing, tone reproduction
curve. 10 mm strips (235 lines),
alternating area coverage, 50%,
25%, 75%, 0%, 100% repeating
(right to left) with a 3 mm white bor-
der. Figure 15.
19 Field test pattern. Uniformity areas,
registration marks and resolutions
targets. Figure 16.
Figure 2 Test pattern 1.
3-5
Purpose
Solid area reproducibility. For checking fus-
ing, stripper finger marks, solid area, offset-
ting and cleaning.
Motion quality, wobble (ROS).
Fuser offsetting and cleaning failure. Stress
test for stripping from the fuser.
21 mm wide strips that run inboard to out-
board of varying area coverage. The 50%
wedge is used for checking IOT darkness.
Used to check for deletions, skew and skips.
Registration and skew.
10 mm wide strips that run inboard to out-
board of alternating area coverage. Used in
manufacturing for automated measurements.
Registration, resolution, uniformity, streaks
and bands
Image Quality RAPs
IQ1