Tektronix Phaser 840, Service Manual

Page: 150 / 207

Service Guide 139
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.
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