Xerox WorkCentre 5790 Series, Service Manual, Page: 699 / 1610

May 2013
3-3 Xerox® WorkCentre® 5790 Family
IQ1
Image Quality
IQ1 Image Quality Entry RAP
Use this RAP to determine the source of an image quality problem.
On a correctly registered document with border erase either on or off, an image quality defect
within 5 mm of the edge of the sheet is acceptable.
Initial Actions
• Check the condition of the paper. Do not use incorrectly cut paper, damp paper, paper
with rough edges, badly drilled paper, paper with wrapper wax or glue. Paper and media
should be stored flat, enclosed in wrappers, in a cool dry environment.
• Check that the paper is within specifications. GP 20 .
• Check that paper tray guides are set to the correct paper size.
• Check the document guides on the DADH.
• Check the original documents for defects. If the documents are damaged passing through
the DADH, go to the
05F Damaged Documents RAP.
• Ensure that the image adjustment mode selections are those used by the customer.
• Clean the charge and transfer/detack corotron.
Procedure
If necessary, refer to IQ1 Internal Test Patterns for:
• A description of image quality defects.
• The optimum test pattern to be used to diagnose the defect.
• An example of all internal test patterns.
If possible, use the customer job to recreate the image quality problem.
Enter Diagnostics,
GP 1 . Select Other Routines. Select dC606 Print Test Patterns. Select a
suitable test pattern. Select 1 Sided. Press Start Test. The printed images of the internal
test pattern are good.
Y
N
Go to
IQ2 Defects RAP.
Check the back of the prints for toner contamination. The back of the prints are clean.
Y
N
Go to
IQ2 Defects RAP.
Select a suitable test pattern. Select 2 Sided. Press Start Test. The printed images of the
internal test pattern are good.
Y
N
Go to
IQ2 Defects RAP.
Check the prints for damage. The prints are not damaged.
Y
N
Go to the
IQ5 Print Damage RAP.
If a facsimile card is installed, send a test facsimile to the machine. The facsimile image
quality is good.
Y
N
Compare the facsimile print with an internal test pattern print. The facsimile print and
the internal print display the same defect.
Y
N
Go to
IQ9 Unacceptable Received Facsimile Image Quality RAP.
Go to IQ2 Defects RAP.
Exit diagnostics. Use the prints of the internal test pattern and make copies of these from the
DADH. The copies of the internal test pattern are good.
Y
N
Go to the
IQ7 DADH, Document Glass and Scanner RAP.
Use the print of the internal test pattern and make three copies from the document glass. The
copies of the internal test pattern are good.
Y
N
Check the image quality defects. The defects on the copies are identical.
Y
N
Go to the
IQ2 Defects RAP.
Go to the IQ7 DADH, Document Glass and Scanner RAP.
Compare the image dimensions of the internal test pattern with the prints through the DADH
and from the document glass. Refer to
IQS 8 Magnification. The dimensions are within
specifications.
Y
N
Go to
ADJ 3.2 Magnification Adjustment.
If possible, use the customer document to make a copy from the document glass or through
the DADH, at 100% magnification. Make another copy at a different magnification setting.
Compare the images,
Figure 1 . The defect is on the same part of the image.
Y N
Return to the start of this procedure and select a different internal test pattern to check the
image quality.
There is a defect on the scanning optics. Refer to ADJ 14.1 Optics Cleaning Procedure (W/O
TAG 150 ) or ADJ 14.2 Optics Cleaning Procedure (W/ TAG 150 ).
Figure 1 The defect location check
A
A
B
B