Xerox 3050 Service Manual page 367

CQ 28 Offsetting and Residual
lmage Isolation RAP
This RAP is used to differentiate between the
Fuser and the Photoreceptor as the source of
an offsetting or residual image copy quality
problem. It may be necessary t o make
several copies t o see if the problem can be
repeated.
Ask the customer for the document that
is causing the problem.
Select a sheet of media and draw a short
line 4 114 inches (108 mm) from the lead
edge and parallel to that edge.
Put the number 0 (zero helps you to
locate line as media exists the fuser) by
one end of the line that was drawn in
step 2. Use this prepared sheet as the
media for the next copy.
Select the Normal Contrast mode
(middle LED is lit).
Insert the lead edge of the prepared
media with the marked side facing
down.
Start t o make a copy, then press the
STOP button when the line marked on
the copy media is even with the outside
edge of the transport latching cover.
NOTE: The mark will move about 1/2 inch
(1.27 cm) beyond the front cover
before the main drive stops.
7. Open the transport latching cover and
remove the partially made copy. Ensure
that the copy is not dragged against the
photoreceptor or fuser roll.
8. Examine the new copy 10 318 inches (264
mm) (circumference of the drum) away
from the lead edge.
NOTE: Locate the exact end o f the fused
area of the image by wiping the
image with a finger.
If defect is in the unfused area,
it
indicates that the photoreceptor is
the source o f the problem.
9. If there is a reprint of the lead edge
information in the unfused area of the
image, the problem
is
residual image.
This is caused by a cleaning problem, a
dirty cleaning blade, or an incorrect
electrostatic value. Go to the CQ-15
Residual lmage RAP.
10. Examine the images within the unfused
area. If the reprint is not in the unfused
area, remove the oil dispense assembly
and check the fuser roll for a dry ink
image. If there i s a dry ink image on the
roll, go t o the CQ-13 Offsetting RAP.
NOTE: If your results are inconclusive you
may need to repeat this procedure.
First, remove the dry ink from the
fuser roll by making a blank copy.
10 318 INCHES
(264 mm)
LEAD EDGE
9
4 114 INCHES
(1 08 mm)
THE PREPARED MEDIA
LEAD EDGE
IMAGE
\
EXAMINE
THIS AREA
A CHECK FOR RESIDUAL IMAGES
FUSED
AREA
J.
7
UNFUSED
AREA
3
121 97
3050
3-83
CQ 28 Offsetting1 Residual Image Isolation RAP