Print Quality Initialization Procedure; Print Defects - Xerox 8825 Service Manual

Print Quality Initialization Procedure

Prior to any print quality troubleshooting, validate that the problem is in the IOT by entering [9-
55]. Select test pattern 5. Examine the test print for defects. If defects appear, complete the
following checklist. If the defects are still present after completing the checklist, refer to the
Image Quality Defects and Classification information on the following pages to classify and
repair the problem.
1. Drum life (Refer to Section 1)
2. Ensure that the Charge Scorotron is not damaged or contaminated.
3. Ensure that the Image Module Roller fully contacts the drum and does not exhibit abnor-
mal wear or contamination.
4. Refer to ADJ 9.2, Electrostatic Series and check that the following voltages are within
specification:
• Charge Scorotron (V High)
• Image Module LED Duty Cycle (V Low)
5. Check that the Toner Concentration (TC) is calibrated correctly [9-21-4]
If the print quality defect is still present, go to the
8825/8830 Printer

Print Defects

in this section.
Print Defects
Print quality refers to the entire print. Defects can occur anywhere on the print. These defects
could be damaged media or print quality defects.
Always eliminate problems that cause the damaged media before attempting to fix print quality
problems. Some damaged media problems could cause print quality problems.
Compare the print defect to the definitions on this page and the next page. After you have
determined the definition that best describes the print defect, go to the Section Contents page.
The Section Contents page will direct you to a Print Quality Problem / Cause Table. The Prob-
lem / Cause Table lists the probable causes and corrective actions.
The PROBABLE CAUSES are arranged in order of most probable cause to least probable
cause or the ease of the check. CORRECTIVE ACTIONS are given for each cause. Read all
of the probable causes before taking any corrective action.
1. Start with the first PROBABLE CAUSE and continue through the list until you come to the
cause that best applies to the image defect.
2. Perform the CORRECTIVE ACTION.
3. If the defect has been corrected, go to the Maintenance Activities in the Service Call Pro-
cedures in Section 1. If the defect is still present, continue with the other PROBABLE
CAUSES.
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Print Quality Initialization Procedure, Print Defects
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Print Quality