Xerox WorkCentre 5687 Series Service Manual page 994

Defect in the same position
Figure 1 The defect location check
IQ1 Internal Test Patterns
Table 1 defines the image defect, gives a description of the defect and identifies the optimum
test pattern to be used.
Table 2 describes the test patterns and the purpose for which they should be used to identify
image quality defects.
Use the test patterns 1, 2, 5, 8, 14, 16 and 19 for image quality analysis. The other test patterns
are designed for the use of initial machine calibration by the manufacturer.
NOTE: Test pattern 19 is only available if the network controller is installed
Table 1 Image quality defects
Image quality
defect Description of defect
Background Uniform darkening across all the non print areas
Bands Grey to dark in the light or non-image areas of the print in the
process direction or across the process direction. See also
narrow bands.
Beads on print Developer beads in the light or non-image areas of the print. 2, 1
Black image A print that is black or grey all over, but has no visible image
of the original document.
Blank image No visible image.
Image Quality RAPs
IQ1
Image quality
defect Description of defect
Blurred image Part or whole of the image has the appearance of being out
of focus. Refer to IQS 4 Resolution.
Dark prints Very dark background with a visible image.
Deletions Areas of the image missing from the print. Deletions may be
in the form of white spots, marks, lines, or whole areas of
toner missing from the print.
Displaced and Distorted images, part images and missing images (scram-
fragmented bled images). Displaced images.
image
Light image The image is visible on the print, but with insufficient solid
area density.
Lines Black or white lines across the process direction or in the pro-
cess direction. See also the description, displaced and frag-
mented image.
Magnification At 100% magnification the printed image differs from the size
of the image on the original document. Refer to IQS 8 Magni-
fication.
Marks Dark marks in the non-image areas of the print.
Misregistration The image on the paper is Misregistration. Refer to IQS 7
Registration.
Narrow Bands Bands across the process direction visible in halftone areas. 8
Non uniformity Variation in image quality and density across the print. See
also uneven density.
Offsetting A previous image that was not removed from the fuser roll
during the cleaning cycle. The image is repeated at regular
intervals.
Part images Incomplete or missing images.
and missing
images
Print damage Creases, curl, cuts, folds, wrinkles, or embossed marks are
visible on the print.
Optimum
Repeat images Refer to offsetting defects and residual image defects.
internal test
Residual A previous image that was not removed from the photorecep-
pattern
image tor during the cleaning cycle.
1
Rotated image The image on the printed document has turned 90 Degrees
2, 5
to the image printed on the original document.
Skew A difference in angular alignment between image on the print
and the original document.
Skips. Loss or stretching of the image, and compression of the
1
image, in bands across the process direction.
Smears Loss or stretching of the image, and compression of the
5
image, in bands across the process direction.
Smudges Darker images across the process direction.
August 2007
3-4
Table 1 Image quality defects
WorkCentre 5687 Family
Optimum
internal test
pattern
19, 16
1, 19
2, 5, 8, 16
5, 16, 19
2, 16, 19
2, 5, 8
11, 19
1, 2
16
5
14
5, 16, 19
5
14, 19
14, 19
19
16
16
16
5