Y-Axis Belt Tension Adjustment (Phaser 840 Printer) - Xerox Phaser 840 Service Manual

Y-axis belt tension adjustment (Phaser 840 printer)

Perform this procedure after replacing, loosening or removing the Y-axis belt drive
assembly. Follow the complete tensioning procedure.
Pay special attention to the following:
Never loosen or remove the screws holding the assembly together. The assembly
I
is put together in a precision fixture and loosening these screws affects the
alignment of the assembly.
Always use the "Position for Belt Tightening" diagnostic test to align the pulleys
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for the best tensioning.
Critical!
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certain to press the tool forcefully against the printer chassis to ensure
maximum tension.
Ensure that the three mounting screws that secure the Y-axis drive assembly to the
1.
chassis are 1 turn loose and that the Y-axis idler bracket slides freely with respect to the
chassis.
Attach the Y-axis belt tension tool (in its unloaded or folded out position) to the
2.
keyholes in the side frame of the printer just below and in front of the Y-axis drive
assembly. The tool's fish hook should engage the eyelet of the Y-axis drive assembly.
Pull forward and down on the lever arm of the tension tool, and keep the tool pressed
3.
against the printer frame to apply tension to the Y-axis belts.
While the belts are under tension, rotate the drum pulley 5 times to rotate the belts and
4.
seat them in place. For an old Y-axis drive assembly, continue rotating the pulleys until
the index marks on each pulley align next to each other.
Beginning with the upper-right screw, tighten the three mounting screws to 30 in.-lbs.
5.
to secure the Y-axis drive assembly in place.
Using PC-based diagnostics, run the test: "Position for Belt Tightening" in the
6.
"Y-Axis Group" test suite. This positions the belts in the proper orientation for
re-tensioning. Do not move the pulleys.
If there is a situation in which diagnostics are not available when
Note
installing a new Y-axis drive assembly or drum/transfix assembly,
then locate any previously placed index marks on the pulleys and
proceed as if re-using existing parts. Allow the system to cool as
long as feasible before mounting the Y-axis drive assembly onto
the chassis. Tensioning of the y-axis drive assembly without
diagnostics increases the risk of failures associated with low belt
tension (for example, a "growling" sound heard upon cold
power-ups).
Place an index mark on the edge of each pulley: Mark the Y-axis drive pulley and the
7.
drum pulley where the edges are closest to one another, disregarding previous marks.
Use a distinct color if the pulleys have been previously marked.
Loosen the 3 mounting screws until the bracket slides freely on the chassis and then
8.
re-tighten the screws to 30 in.-lbs.
Release the tension tool's lever arm and remove the tool.
9.
Set the printer's Print Quality Mode to Standard and Duplex Mode to On.
10.
Print service test print 8: YMCKRGB Solid Filles from the hidden service menu,
11.
3 times.
Repeat the complete tensioning procedure, Steps 1 through 9.
12.
4 - 142 Phaser 840/850/860/8200 Color Printer - Service Manual
- During the final lock down of the Y-axis mounting screws, make