Lexmark C520 Service Manual - Page 70
Print quality service check
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5022-xxx Print quality service check Note: This symptom may require replacement of one or more CRUs (Customer Replaceable Units) designated as supplies or maintenance items, which are the responsibility of the customer. With the customer's permission, you may need to install a developer (toner) cartridge or photoconductor unit. Service tip: Before troubleshooting any print quality problems, do the following: 1. Print a menu settings page, and check the life status of all supplies. Any supplies that are low should be replaced. Note: Be sure and keep the original menu page to restore the customer's custom settings if needed. 2. On the menu page, make sure the following is set to the default level: - Color Correction: Set to Auto. - Print Resolution: Set to 1200 dpi (print quality problems should be checked at different resolution settings). - Toner Darkness: Set to 4 (default). - Color Saver: Set to OFF. - RGB Brightness, RGB Contrast, RGB Saturation: Set to 0. - Color Balance: Select Reset Defaults to zero out all colors. - Check the paper type, texture and weight settings against what is loaded in the printer. Once the printer has been restored to its default levels, do the following: 3. Inspect the transfer belt for damage. Replace if damaged. 4. Inspect the OPCs and toner cartridges for damage. Replace if damaged. 5. If paper other than 20lb plain letter/A4 paper is being used, load 20lb plain letter/A4 and print the Print Quality pages to see if the problem remains. 6. Use Tray 1 to test print quality problems. 7. Print the Print Quality Pages, and looked for variations in the print from what is expected. An incorrect printer driver for the installed software can cause problems. Incorrect characters could print, and the copy may not fit the page correctly. Measure all voltages from the connector to the printer ground. Print quality-background Service tip: Some background problems can be caused by rough papers, non-Lexmark toner cartridges or if the media texture is set to the rough setting. Some slick or coated papers may also cause background problems. Some problems occur with printers that run a large amount of graphics in a humid environment. Step Questions / actions Yes No 1 Read the current status of the photoconductor Reset the value. To reset unit from the customer menus. this value: Go to step 2. To view the status of the photoconductor units: 1. In Ready mode, press . 2. Select Reports, and press . 3. Select Device Statistics, and press . Ask the customer if the photoconductor unit has been recently replaced. It is possible the photoconductor value was not reset and the photoconductor unit is past end of life. If the PC unit was recently replaced, reset the value. If the PC unit was not replaced, replace the PC unit. Has the photoconductor unit been recently replaced? 1. In Ready mode, press . 2. Select Supplies Menu, and press . 3. Select Replace Supply, and press . 4. Select the PC color unit you want to change, and press . 5. Select Yes, and press . If this does not fix the problem, go to step 2. Diagnostic information 2-55