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Service Guide
99
Drum position sensor assembly
1.
Remove the left 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 tilt gear to orient the gear’s missing teeth to the drum
position sensor assembly’s rear mounting screw.
7.
With a small, flatblade screwdriver, slide the retaining spring out of the
encoder wheel’s groove toward the encoder disk.
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
Summary of Contents for Phaser 840
Page 46: ...36 Phaser 840 Color Printer ...
Page 95: ...Service Guide 85 Clearing PostScript NVRAM menu item ...
Page 96: ...86 Phaser 840 Color Printer ...
Page 121: ...Service Guide 111 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 ...
Page 125: ...Service Guide 115 Figure 3 Paper path FRUs 0388 16 2 1 5 11 10 9 12 6 4 3 7 13 8 ...
Page 127: ...Service Guide 117 Figure 4 Motors and fans FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 129: ...Service Guide 119 Figure 5 Circuit boards FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 13 12 ...
Page 131: ...Service Guide 121 Figure 6 Solenoids and clutches FRUs 4 5 3 2 1 0388 23 ...
Page 137: ...Service Guide 127 Figure 9 High capacity PaperTray 0388 65a 1 2 ...
Page 142: ...132 Phaser 840 Color Printer ...
Page 154: ...144 Phaser 840 Color Printer ...