Xerox PHASER 7500, Service Manual

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Phaser 7500 Printer Service Manual 5-23
Print-Quality Troubleshooting
IQ-15 Photoreceptor
Pitch Color Stripes Vibrations during the Drum CRU
transportation may cause scrapes and friction
in the BCR and the Photoreceptor, resulting in
leftover electrostatic memory on the
Photoreceptor that generates thin white
streaks in the FS direction on the highlight
portion at the Photoreceptor Pitch. 5-42
IQ-16 Background on
Glossy Media Compared to Plain Paper, background is more
visible on Glossy media. 5-44
IQ-17 Toner Image
Detection Color
Stripes At Pre Near or Near Empty state, if a
customer had removed the Cartridge and
knocked on it to collect the toner towards the
exit in attempt to use the very last bit of
toner, it may cause color stripe deterioration. 5-45
IQ-18 Toner Droplet
Contamination A contamination consisting of random
spatters of toner in sizes of a few millimeters. 5-46
IQ-19 Smear on
Heavyweight When the lead edge of paper reaches the
Secondary Transfer, it immediately increases
the Secondary Transfer section load and
causes the IBT Drive Roll speed to change
(decrease in speed). 5-47
IQ-20 Rough Black On paper that is not flat or has poor hue, the
toner may not have been transferred properly
due to the irregular paper surface, creating a
rough transferred image. 5-49
IQ-21 Moist Paper
Transfer Failure The resistance is lowered because the paper is
moist. 5-50
IQ-22 Toner
Contamination at
Lead/ Trail Edge Lead Edge: Paper lead edge contacts the Belt
when it is transported from REGI to Transfer.
Tail Edge: The tail edge of Paper that loops
between the Transfer-Fusing sections, at the
release of the Secondary Transfer NIP, moves
opposite to the feed direction and contacts
the BTR surface, or bounds up and contacts
the Belt. 5-51
IQ-23 Side 2 Transfer
Failure Paper that has had its Side 1 fused has a
reduced percentage of moisture content,
which increases its electric resistance. Since
the resistance in the Secondary Transfer
section also increases by lower humidity or
over time, the required electrical field may
not be attained, especially in the early
mornings (low humidity environment). 5-52
IQ-24 Trail Edge
Transfer Failure The paper tail edge, after the Secondary
Transfer NIP has been released, bounded up
due to the fusing stroke effect and re-
transfers to the Intermediate Transfer Belt. 5-53
Defect Definition Page