Xerox Synergix 8825, Service Manual

Page: 65 / 396

01/02
3-17 8825/8830 Printer
PQ 17, PQ 17A
Print Quality
PQ 17 Smears PQ 17A Smudge
Table 1 Smears Symptom / Check
Symptom/ check
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. Location of Smear Probable Cause Corrective Action
20 - 25 mm from the
Lead Edge of the
print Transfer/Detack
Shield incorrectly
installed. Check / replace (
PL 9.4 )
40 - 50 mm from the
Lead Edge of the
print Fabric Guide worn,
contaminated or
incorrectly installed. Check / replace (
REP 8.9 ).
106 - 126 mm from
the Lead Edge of
the print 1. Worn (smooth)
Heat Roll (
PL 10.2 )
2. Worn Contami-
nated Fabric Guide
(
PL 10.3 )
3. Pressure Plate A
installed incorrectly
or deformed (
PL
10.3 ).
Check / replace (
REP 10.2 )
Check / replace (
REP 8.9 )
3. Check / replace
(
REP 8.5 )
150 - 170 mm from
the Lead Edge of
the print Pressure Plate B
installed incorrectly
or deformed. Check / replace (
REP 8.5 )
140 - 160 mm from
the Trail Edge of
the print Cutter Check for loose
Cutter Drive Pulley,
Shim / replace (
PL
7.8 )
66 - 86 mm from the
Trail Edge of the
print (Register Roll
Exit Smear) Buckle Switch Enter [8-2 and
check for correct
operation (
PL 8.4 )
Random smears Media Transport Ensure that the
Media Transport
gap (
ADJ 8.4 ) is set
correctly.
Table 1 Smudge Symptom / Check
Symptom/ check
A smudge is a displacement
of the toner image on the
drum or the media. Location of
Smudge Probable Cause Corrective Action
Perform GP 2 , Image on
Drum to determine if the
Smudge occurs on the
media or the drum.
Media Heat Roll Check for a worn
(smooth) Heat Roll.
Replace (
REP
10.2 )
Media Fabric Guide Check for a worn /
contaminated Fab-
ric Guide. (
REP
8.9 )
Media Excessive media
curl (smudge
appears 100 mm
from lead or trail
edge) Ask the customer to
replace the media.
Media Detack Corotron Check for contami-
nation or signs of
arcing. Clean /
replace (
PL 9.4 )
Media Buckle Switch Check the Buckle
Switch for correct
operation (
PL 8.4 )
Vellum Smudge is a special
defect that exhibits marginal
fusing fix. Toner can chip off
of the media and horizontal
lines are broken (image dis-
placement). Combination of Vellum beam strength
and low Heat Roll drive force. (The
media is flexible enough that it buckles
between Pressure Plates A and B. The
toner then melts and partially sticks to the
Heat Roll. As the media enters the Pres-
sure Plate B, it flattens and the image is
displaced in front of it’s correct position.
The toner can also become a clump on
the media and easily chip off of the
media.) Replace the Fabric
Guide (
REP 8.9 )
and the Heat Roll (
REP 10.2 ).
Drum Mechanical interfer-
ence with the image
on the drum Check for interfer-
ence.
Drum Buildup of devel-
oper material on the
lower extrusion of
the developer hous-
ing rubbing the
developed image
on the drum. Push excess devel-
oper material back
into the housing.