Lexmark Optra C710 Service Manual - Page 150

5016-001 Black or Color Spots Service Check Note: This symptom may require replacement of one or more 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 an ITM unit or a print cartridge. FRU 1 Print Cartridge 2 Cleaning Unit 3 ITM Unit 4 Fuser Assembly Action Try a new print cartridge. Check the fuser cleaning unit for correct operation and signs of contamination. Replace the cleaning unit, if any problems are found. Check the ITM belt for signs of color or black toner left on the belt after the a page has printed. If toner is found, the ITM is not functioning properly. Try a new ITM assembly. Check the backup and hot rolls for signs of toner buildup or contamination. If toner buildup is found, repair or replace the fuser assembly. Developer Drive System Service Check Print quality problems - Either all blank pages, some color, or one color missing from the printed page. FRU 1 Print Cartridge(s) 2 Developer Drive Gear B16 Timing Belt Developer Sleeve Idler Pulley Developer Decrease Gear Spring Action Try a new print cartridge(s). Check the developer drive gear, timing belt and developer sleeve located in the motor mounting stay A assembly for correct operation. If problems are found, repair or replace Stay A assembly as needed. Check the idler pulley, timing belt, developer decrease gear and spring, located on the right side frame under the motor mounting C assembly. If problems are found, repair or replace any failing FRUs. 2-84 Service Manual