Drum Position Sensor Assembly (Phaser 840 Printer) - Xerox Phaser 840 Service Manual

Drum position sensor assembly (Phaser 840
printer)
Remove the left and right cover.
1.
Remove the top cover.
2.
Unhook the head-tilt spring to avoid possible damage to the
Caution
printhead and drum.
Disconnect the drum home-position sensor wiring harness from J180 of
3.
left I/O board leading to the drum position assembly. Disconnect the drum position
encoder sensor at the drum position assembly.
Remove the clear plastic dust cover from the drum position assembly.
4.
Precisely mark the end of the drum shaft relative to the drum home flag on the drum
5.
position sensor assembly; this is not necessary if you are also replacing the drum (as
part of the drum/transfix assembly).
Drum home
flag
Drum position
encoder wheel
Fig 7-11 Marking the drum home flag sensor alignment
Rotate the X-axis drive gear to move the printhead to its print position.
6.
Rotate the tilt gear to orient the gear's missing teeth to the drum position sensor
7.
assembly's rear mounting screw.
With a small, flatblade screwdriver, slide the retaining spring out of the encoder
8.
wheel's groove toward the encoder disk.
7 - 192 Phaser 840/850/860/8200 Color Printer - Service Manual
Mark on the drum shaft to
align with the home flag
840-4-17