Xerox DocuPrint P8e Service Manual page 128

Defect Definitions
CHARACTER DEFECTS:
Garbled print, missing, repeating,
or scrambled characters are
problems relating to font data or
character generation. These are
print defects not related to the
electrophotographic process.
There are spots of
SPOTS:
.
toner on the page
UNFUSED IMAGE: part of or all
of the image is unfused.
STREAKS: Extraneous dark
lines/bands in or across the
process direction. These are
Engine Controller defects not
related to the Controller PWB or
Host Data.
RESIDUAL IMAGES: The image
from a previous print, which was
not removed during the cleaning
process, has been developed on
the current print.
BACKGROUND: Uniform toner
contamination in non image
areas.
Repair Analysis Procedures (RAP)
Possible Causes
1. Defective font download.
2. Loose / defective cables,
cables out of specification (too
long, etc.).
3. Electromagnetic interference.
4. Defective SIMM.
5. Controller PWB.
6. Engine Controller PWB.
1. Paper.
2. Paper path contaminated.
3. Print Cartridge
4. Fuser Assembly.
5. Transfer Roller.
1. Damp paper.
2. Paper quality.
3. Light image density
4. Fuser Assembly.
5. Engine Controller PWB.
1. Print Cartridge.
2. Fuser Assembly.
3. Transfer Roller.
4. Contaminated paper path.
1. Print Cartridge.
2. Fuser Assembly.
3. Erase Lamps.
4. High Voltage Contacts
1. Print Density.
2. High voltage output.
3. Print Cartridge.
7/98
7-14
Solutions
1. Customer may have recently changed/modified
host software or drivers. Reconfigure if
necessary.
2. Inspect cable connections for proper installation
and for damage. Parallel cable must be a good
quality and comply with the IEEE 1284 bi-
directional specification.
3. Relocate printer to another location or to another
power outlet.
4. Replace the SIMM (PL 10).
5. Replace the Controller PWB (PL 10).
6. Replace the Engine Controller PWB (PL 10).
1. Replace paper from a fresh unopened ream.
2. Clean paper path.
3. Replace Print Cartridge (PL 1).
4. Inspect/clean/replace Fuser Assembly as
necessary (PL 8).
5. If spot repeats every 47.1 mm (1.9 in.), replace
the Transfer Roller (PL 7).
1. Replace paper from a fresh unopened ream.
2. Be sure that the paper is not extremely rough,
heavily textured, or of a high rag content.
3. Check Remote Control Panel print quality
settings.
4. Inspect/clean/replace Fuser Assembly as
necessary (PL 8).
5. Replace the Engine Controller PWB (PL 10).
1. Inspect drum surface for scratches or bands. If
defective, replace the Print Cartridge (PL 1).
2. Inspect fuser rollers for scratches or
contamination. If defective, replace the Fuser
Assembly (PL 8).
3. Inspect Transfer Roller. If defective, replace the
Transfer Roller (PL 7).
4. Clean the paper path.
1. Replace Printer cartage (PL 1).
2. Inspect/clean/replace Fuser Assembly as
necessary (PL 8).
3. Remove the Print Cartridge, attach the DCU and
perform diagnostic test 04. Verify operation of
the Erase Lamps. Replace as necessary.
4. Verify that all high voltage outputs are to
specification (refer to section 5, DCU operation).
Clean all high voltage contacts.
1. Verify print quality setting in the Remote Control
Panel.
2. Verify that all high voltage outputs are to
specification (refer to section 5, DCU operation).
Clean all high voltage contacts.
3. Replace the Print Cartridge (PL 1).
Xerox DocuPrint P8e Service Manual