Xerox Phaser 8860 Service Manual page 120

If there is ink on the top and bottom margin of the page or ink on the back of the page, it may
be caused by the roller remaining down during the print. You may hear an unusual noise if the
Transfix Roller stays down and rubs against the drum. Inspect the Drive Train and ensure that it
self-homes between prints. The drive train is in its home position when the two 1.5 mm holes
found on the clear plastic cover align axially with corresponding holes in the gear. Another way
to verify that the drive train is in its home position is to verify that the two small leaf springs from
the clear plastic cover are seated correctly in their corresponding gear slots. Inspect the perim-
eter of the cam lobes for surface defects and check to see that the angular orientations of the
cams match. Inspect the transfix load arm return springs. Verify that the maintenance kit
returns home between prints. Inspect the cam shaft surfaces for damage. If all of these items
are working correctly, replace the Process Drive module.
Figure 6 Grey Fill, Dot Size Uniformity Test Print
Five Duplex GSF
This print is used by Manufacturing and Engineering only.
YMCKRGB Solid Fills
This test prints a single-sided, solid-fill print in all seven colors to show uniformity of fill. If colors
are uneven or wrong, see IQ18.
Look for:
• Even, uniform fill throughout each print.
• Wrinkles or deformity of the paper.
• Proper ink transfer.
• White striping or banding.
Image Quality
Figure 7 YMCKRGB Solid Fill Test Prints
Causes:
• Weak jets or improper Drum heating can cause uneven fills.
• To solve wrinkling, try different print media. Replace the maintenance kit to correct streak-
ing. Check the drum temperature sensor for debris build-up on the sensor. Check to see if
the sensor is in improper contact with the drum. See the Reverse Text test print. As a last
resort to fix wrinkling, replace the Transfix Roller, transfix load module, and transfix load
arm.
• If there is poor transfer on one side, check to see if the transfix load arm assemblies are
moving easily. Clean any contamination that may be interfering with the transfix arm
assembly movement. If either of the transfix load arm assemblies are worn, replace the
worn load arm assembly.
• If there are repeating white stripes on the print, there may be a problem with the X-Axis
motion, see IQ31.
Drum Seal
This print is used by manufacturing and Engineering only.
Paper Path
This print is used by Manufacturing and Engineering only.
Head to Drum Check
These prints indicate if the gap between the printhead and the drum is correct.
09/2007
3-28
Initial Issue
Phaser 8860/8860MFP Service Manual