Pq 17 Smears; Pq 17A Smudge - Xerox 8850 Service Manual

PQ 17 Smears

Table 1 Smears Symptom / Check
Symptom/ check Location of Smear Probable Cause
Areas of the image on the
print are blurred. This
occurs at the image transfer
area and is caused by a dif-
ference of speed between
the Drum and the media.
20 - 25 mm from the
Lead Edge of the
print
Random smears
106 - 126 mm from
the Lead Edge of
the print
140 - 160 mm from
the Trail Edge of
the print
Print Quality
PQ 17, PQ 17A
Corrective Action
Media Guides miss- Check / replace (PL
ing or incorrectly 9.4)
installed.
BTR Drive Gears Check and clean
worn, contami- BTR Drive Gears.
nated or broken. Replace if broken.
(REP 9.22).
Worn (smooth) Check / replace
Fuser Heat Roll (PL (REP 10.2)
10.2)
Cutter Check for loose
Cutter Drive Pulley,
Shim / replace (PL
7.8)

PQ 17A Smudge

Table 1 Smudge Symptom / Check
Symptom/ check Location
A smudge is a displacement Smudge
of the toner image on the
Drum or the media.
Perform GP 2, Image on Media
Drum to determine if the
Smudge occurs on the
media or the Drum.
Media
Media
Media
Vellum Smudge is a special Combination of Vellum beam strength
defect that exhibits marginal and low Fuser Heat Roll drive force. (The
fusing fix. Toner can chip off media is flexible enough that it buckles
of the media and horizontal during fusing. The toner then melts and
lines are broken (image dis- partially sticks to the Fuser Heat Roll.
placement). The image is displaced in front of it's cor-
rect position.
become a clump on the media and easily
chip off of the media.)
Drum
Drum
03/2003
3-18
of Probable Cause Corrective Action
Fuser Heat Roll Check for a worn
(smooth) Fuser
Heat Roll. Replace
(REP 10.2)
Pressure Roll Check for a worn/
contaminated Pres-
sure Roll. (REP
10.8)
Excessive media Ask the customer to
curl (smudge replace the media.
appears 100 mm
from lead or trail
edge)
Detack Corotron Check for contami-
nation or signs of
arcing. Clean /
replace (PL 9.4)
Replace the Fuser
Heat Roll and/ or
Pressure Roll (REP
10.2, REP 10.8).
The toner can also
Mechanical interfer- Check for interfer-
ence with the image ence.
on the Drum
Buildup of devel- Push excess devel-
oper material on the oper material back
lower extrusion of into the housing.
the developer hous-
ing rubbing the
developed image
on the Drum.
8850/ 510DP