How
to
Use the
lmage
Defect
Samples
Copy quality refers to the entire copy. The
total copy could have certain defects, such as
damaged media or image quality defects on
the copy.
Always eliminate problems that cause the
damaged media before attempting to fix
image quality problems.
Some
damaged
media problems could cause image quality
problems.
The causes for some image quality problems
can
be
isolated by using the lmage on Drum
(Panic Stop) Procedure (General Procedures in
Section
6).
The image quality defect samples on the
following pages may be used as references to
identify the defective image quality
characteristics. The majority of the samples
are cropped areas of the defective test
pattern.
A
reduced area
(25
percent of the
original size) gives an idea of how the defect
may appear on the copy while the actual size
sample shows the detail that the defect may.
have.
The PROBABLE CAUSE column
is
most often
arranged in the order of either the most
probable cause to least probable cause or the
greatest ease to greatest difficulty of the
check. Opposite each PROBABLE CAUSE
is
the
CORRECTIVE ACTION for that cause. Read the
entire probable cause
list
before taking any
corrective action.
I
NOTE:
Some of the copy quality defect
samples still show the old test pattern.
Please disregard which test pattern
is
shown. The purpose of the samples is to
show the defect, and not the test pattern.
Compare the copy defect to the examples
listed on
the
following pages. Once you have
determined the defect sample that best
describes the image defect, perform the
following:
a. Start with the first PROBABLE CAUSE
and continue through the
list
until you
come to the cause that best applies to
the copy defect.
b. Perform the CORRECTIVE ACTION.
c. If the defect has been corrected, go to
the Maintenance Activities in the
Service Call Procedures in Section
1.
If
the defect
is
still
present, continue
with the other PROBABLE CAUSES.
lmage
Quality
Definitions
The
following terms are some of those most
commonly used that describe copy quality
problems.
Background
A
degree
of
darkness or dirtiness
that
is
overall or localized in the areas of the copy
where no image
is
present.
Black
Copy
A copy that
is
entirely black except for the
lead edge and trail edge and possibly the
left and right borders.
Blank
Copy
A
copy entirely without an image.
Cold Flow
A distortion in the selenium alloy coating on
the photoreceptor drum. This defect can
appear anywhere on the copy and will be
perpendicular to the media feed.
(Continued)
8196
Image Quality Definitions
3-2 25101251s
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