Iq1 Image Quality Entry Rap - Xerox Phaser 4600 Service Manual

IQ1 Image Quality Entry RAP

The purpose of this RAP is to establish the source and type of imaging defect. Print-quality
defects can be attributed to printer components, consumables, media, internal software, exter-
nal software applications, and environmental conditions. To successfully troubleshoot print-
quality problems, eliminate as many variables as possible. First, recreate the perceived defect
using the customer's job or test print. Use approved laser paper from a fresh ream acclimated
to room temperature and humidity.
If the print-quality defect is still present after printing on approved media from an unopened
ream of paper, investigate software applications being used and environmental conditions.
Check the temperature and humidity under which the printer is operating. Compare this to the
"Environmental Specifications". Extreme temperature and humidity can adversely affect the
printer's xerographic and fusing characteristics.
When analyzing a imaging defect, determine if the defect is repeating or random. Continuous
defects in the process direction, such as voids and lines, are the most difficult to diagnose.
Check the CRU life counters for end of life conditions. Inspect the visible surfaces of all rollers
for obvious defects. If a cursory inspection does not reveal any obvious defects, continue trou-
bleshooting the defect, starting with the list of initial actions.
Initial Actions
Use the following steps to determine which part of the system is at fault.
1. If possible, discuss the defect with the customer to determine if the percieved defect is
outside the printer's image specifications.
2. Ensure all connections to the printer are secure.
3. Check the CRU life counts. Replace components at end of life.
4. Cycle system power.
5. Make sure the printer is positioned to allow adequate airflow at all vents. Refer to
Installation Space Requirements.
6. Make sure the printer's interior is clean.
7. Check the tray guides.
8. Use the customer's print job to check defect reoccurrence. If the defect persists, begin to
isolate the defect by attempting to identify the component responsible.
9. Check stored tray settings for media size and type.
10. Check image adjustment and print mode settings being used.
Defects Associated with Specific Components
To aid with defect diagnosis, listed below are defects associated with specific components.
Laser Unit image defects:
• Black Print
• Vertical white lines
• Curved lines
Transfer Roller image defects:
• Uneven Density
• Background contamination
• Ghosting
Revised
Phaser 4600/4620/4622 Printer Service Manual
• Vertical white lines
• Vertical black line or band
• Stains on the page back
Fuser image defects:
• Ghosting
• Stains on the page back or front
• Poor image adhesion
Drum Cartridge image defects:
• Uneven density
• Background contamination
• Spots, smudges, or smears
• Ghosting
• Vertical white lines
• Vertical black line or band
• Stains on the page front
• Blank prints
• Black prints
• Horizontal Black lines or bands
After determining the defect type and possible source, match the defect with thoses listed in
Table 1. Go to the RAP listed to correct the defect.
Image Defect Definitions
Table 1 lists image defect definitions and the RAP(s) used to correct the problem.
GP 17,
Defect Definition
Deletions There are areas (lines, bands, spots) missing entirely.
Unfused Image Part or all of the image is infused. Refer to the specification.
Resolution At 600 dpi, the two pixel lines and halftone patches cannot be
reproduced clearly on the print.
Skip - Image loss or stretching in horizontal bands.
Skips and
Smear - Image distortion in bands across the process direction
Smears
that appear blurred or compressed.
Spots There are spots of toner on the page.
Skewed Image Angular image displacement from its intended position.
Light Prints The overall image density is too light.
Blank Prints Prints with no visible image.
Black Prints The print is completely covered with toner with no image.
Process Deltions Areas of the image are extremely light or missing entirely.
Defects run vertically in the direction of paper movement.
Scan Deletions Areas of the image are extremely light or missing entirely.
Defects run horizontally across the page.
Process Streaks Extraneous dark lines/bands in the process direction.
Scan Streaks Extraneous dark lines/bands in the direction of scan.
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Table 1 Image Defect Definitions
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IQ3
IQ4
IQ2
IQ7
IQ5
IQ6
IQ8
IQ9
IQ2
IQ2
IQ10
IQ11
3 Image Quality
IQ1