6 - 178 Phaser 840/850/860/8200 Color Printer - Service ManualInspectionRollers: Replace the rollers when you see any of the following defects: Flat spots Out of roundness Cracked rubber Loss of traction (tackiness) causing pick or feed failuresGears: Replace gears that show any signs of wear or breakage. Look for these problems: Thinned gear teeth. Bent or missing gear teeth; check especially where a metal gear drives a plasticgear. Fractured or cracked gears (Oil or incorrect grease on a plastic gear can causethe gear to crack.)Belts: Inspect the belts for wear. There are eight rubber belts in the printer: A belt from the process motor to the compound gear Two belts from the y-axis motor drive A belt from the lower paper-feed roller to the upper paper-feed roller Two belts on the cap/wipe/purge drive An exit-roller drive belt A small belt for driving the cap/wipe purge assembly from the cap/wipe/purgeclutchLook for these problems: Loose rubber particles below the belts indicate a worn belt Missing teeth in the belts Cracking or moderate fraying; a small amount of fraying is inevitable, so lookfor other signs of wear before replacing the beltClutches: There are four clutches: the paper-pick roller clutch, the upper-feed-rollerclutch, the maintenance drawer cam clutch and the cap/wipe/purge clutch. Symptoms of amalfunctioning clutch are the printer not picking paper from the tray or other paper jams.Also the cap/wipe/purge system could fail. In such cases, replace the clutch. Intermittentjams are often caused by failing clutches.
