4 - 142 Phaser 840/850/860/8200 Color Printer - Service ManualY-axis belt tension adjustment (Phaser 840 printer)Perform this procedure after replacing, loosening or removing the Y-axis belt driveassembly. Follow the complete tensioning procedure.Pay special attention to the following: Never loosen or remove the screws holding the assembly together. The assemblyis put together in a precision fixture and loosening these screws affects thealignment of the assembly. Always use the ìPosition for Belt Tighteningî diagnostic test to align the pulleysfor the best tensioning. Critical! - During the final lock down of the Y-axis mounting screws, makecertain to press the tool forcefully against the printer chassis to ensuremaximum tension.1. Ensure that the three mounting screws that secure the Y-axis drive assembly to thechassis are 1 turn loose and that the Y-axis idler bracket slides freely with respect to thechassis.2. Attach the Y-axis belt tension tool (in its unloaded or folded out position) to thekeyholes in the side frame of the printer just below and in front of the Y-axis driveassembly. The tool's fish hook should engage the eyelet of the Y-axis drive assembly.3. Pull forward and down on the lever arm of the tension tool, and keep the tool pressedagainst the printer frame to apply tension to the Y-axis belts.4. While the belts are under tension, rotate the drum pulley 5 times to rotate the belts andseat them in place. For an old Y-axis drive assembly, continue rotating the pulleys untilthe index marks on each pulley align next to each other.5. Beginning with the upper-right screw, tighten the three mounting screws to 30 in.-lbs.to secure the Y-axis drive assembly in place.6. Using PC-based diagnostics, run the test: ìPosition for Belt Tighteningî in theìY-Axis Groupî test suite. This positions the belts in the proper orientation forre-tensioning. Do not move the pulleys.Note If there is a situation in which diagnostics are not available wheninstalling a new Y-axis drive assembly or drum/transfix assembly,then locate any previously placed index marks on the pulleys andproceed as if re-using existing parts. Allow the system to cool aslong as feasible before mounting the Y-axis drive assembly ontothe chassis. Tensioning of the y-axis drive assembly withoutdiagnostics increases the risk of failures associated with low belttension (for example, a ìgrowlingî sound heard upon coldpower-ups).7. Place an index mark on the edge of each pulley: Mark the Y-axis drive pulley and thedrum pulley where the edges are closest to one another, disregarding previous marks.Use a distinct color if the pulleys have been previously marked.8. Loosen the 3 mounting screws until the bracket slides freely on the chassis and thenre-tighten the screws to 30 in.-lbs.9. Release the tension tool's lever arm and remove the tool.10.Set the printerís Print Quality Mode to Standard and Duplex Mode to On.11.Print service test print 8: YMCKRGB Solid Filles from the hidden service menu,3 times.12.Repeat the complete tensioning procedure, Steps 1 through 9.
