Xerox 8850 Service Manual

03/2003
3-14
8850/ 510DP
PQ 9, PQ 10
Print Quality
PQ 9 Deletions (bands) (Non-feed Direction) PQ 10 Deletions (in solid and halftone areas)
Table 1 Deletions (bands) Symptom / Check
Symptom/ check
Deletion bands or very low
image density perpendicular
to the print feed direction.
Probable Cause Corrective Action
1. Damp media 1A. Refer to BSD 7.1 and
BSD 7.3 to check for correct
operation of the Paper heat-
ers.
1B. Ensure that the Customer
is storing the media correctly.
2. Incorrect Corotron opera-
tion.
2A. Check / Clean or replace
the Detack corotron as
required (REP 9.9).
2B. Perform GP 1 Xero-
graphic HVPS Checkout Pro-
cedure.
4. Defective Drum, defective
Drum drive or defective BTR
drive.
4A. Check for correct opera-
tion of the drive system.
Repair or replace Drive gears.
4B. Replace the Drum (REP
9.3).
5. Magnetic roll 5A. Ensure that the housing
is latched securely.
5B. Check the magnetic roll
for damage or binding.
6. Image Module Spacing
Rollers not contacting Drum
6. Check/ clean/ replace as
required (PL 9.3).
7. BTR Spacing Rollers not
contacting Drum
7. Check/ clean/ replace as
required (PL 8.3).
8. Damaged Drum Drive
Encoder
8. Replace the Drum Drive
Motor (PL 9.1)
Table 1 Deletions (in solid and halftone areas) Symptom / Check
Symptom/ check
Bands of deletion in the solid
or halftone areas in the print
feed direction.
Probable Cause Corrective Action
1. Damp media 1A. Refer to BSD 7.1 and
BSD 7.3 to check for correct
operation of the Paper heat-
ers.
1B. Ensure that the Customer
is storing the media correctly.
2. Exposure 2A. Clean the Image Bar.
(REP 9.18).
2B. Enter [9-21-5 and check
for correct operation. (Refer
to BSD 6.1 and check for cor-
rect electrical connections to/
from the Receiver PWB and
the LED Image Bar).
3. Contaminated/ defective
BTR
3. Clean/ replace BTR (PL
8.3)
4. Incorrect Corotron opera-
tion
4. Perform GP 1, Xerographic
HVPS Checkout Procedure.
5. Magnetic roll 5. Check the magnetic roll for
damage or binding. Clean the
Pressure Equalizer Tubes
6. The surface of the Fuser
Heat Roll or Pressure Roll is
damaged.
6. Determine and fix the
cause of the damage to the
Rolls. Replace the rolls (REP
10.2, REP 10.8).

Xerox 8850 Specifications

General

Brand	Xerox
Model	8850
Category	Printer
Language	English