Xerox Phaser 840, Руководство по обслуживанию, Страница: 208 / 287

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