Oki C9800 Series Service & Troubleshooting Manual

Also see for C9800 Series: Specifications User guide Manual Safety and regulatory information Regulatory and safety information

Contents

Oki C9800 Series Service & Troubleshooting Manual Manual pdf 60 page image

Random Bands, Lines, Marks, or Missing SpotsThere are areas of the image extremely light or are missing entirely and do not appear tobe a repeating defect or in a single color.CautionLeaving an Imaging Unit exposed to light for periods in excess of 10 minutes can quicklydegrade its performance and result in early failure.Initial Actions Perform Initial Actions from Print Quality Troubleshooting Practices Using a flashlight, carefully examine the area around the Imaging Units and theopenings between the Imaging Units and LED Heads. Small obstructions, such as hair orfibers, can create streaks When troubleshooting, print a test print on at least letter size paper for diagnosing thisproblem. The problem may be a repeating defect that is not noticeable on smaller media. Random missing spots can also be associated with “Cold Offset”, which lifts toner offthe page in certain areas. Usually this will occur in high-coverage areas where the fusertemperature is not high enough to fuse the toner on the media. This causes toner to bere-deposited further down the page.Areas of the Printer that Apply to Random Bands, Lines, Marks, or Missing Spots Imaging Unit Fuser Transfer Unit Engine Control BoardTroubleshooting Steps Resolution1. Check for obstructions between the LED Heads and the Imaging Units. Removethe Imaging Unit and inspect each Drum and corresponding area. Remove anydebris.Yes – Remove the obstruction ordebris.No - Go to Step 2.2. Replace the Imaging Unit. Does the image quality improve? Yes – Complete.No - Go to Step 3.3. Replace the Transfer Unit. Does the imaging quality improve? Yes – Complete.No - Go to Step 4.4. Replace the Fuser. Does the image quality improve? Yes – Complete.No - Go to Step 5.5. Replace the LED Head. Does the image quality improve? Yes – Complete.No – Replace the engine PCB.