Xerox Phaser 840, Service Manual

Page: 209 / 287

Removal and Replacement Procedures 7 - 193
9.
Remove the three screws securing the drum position sensor assembly housing to the
print engine. Insert the gap tool to hold the encoder wheel in position. Slide the
assembly off the drum shaft. If necessary, use the small flat-blade screwdriver to push
the encoder disk hub along the shaft as you remove the assembly.
Reverse these steps to reinstall the drum position sensor assembly. The drum must be in
the same position relative to the drum position encoder wheel when the drum position
sensor assembly was removed. This ensures that the stripper fingers contact the drum in
the same location as before; otherwise, print artifacts will result.
■
Install the encoder wheel on the drum shaft, precisely aligning the home flag to
the alignment mark drawn on the shaft.
■
Use the encoder wheel gap tool to space the encoder wheel to the drum position
sensor.
Fig 7-12 Removing the drum position sensor assembly
(Phaser 840 printer)
840-4-18
Screws
Slide the
retaining spring
out of the
groove
Groove
Drum position
sensor
assembly