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Service Guide
15
Caution
The actual position of some printer assemblies, such as the
printhead or the cap/wipe/purge assembly, cannot be ascertained
at all times. The printer records, in NVRAM, where it last
positioned such assemblies each time it moves them. If, after
power-down or a power interruption, the assemblies are manually
repositioned, the printer erroneously assumes that the assemblies
are in the position it last left them. This assumption can result in
damage to the printer when it tries to position the assemblies. For
example, the printhead could be tilted forward and crash into the
raised cap/wipe/purge assembly.
Before turning on the printer, ensure the printhead is tilted
forward, centered in front of the drum and the cap/wipe/purge
assembly is in the retracted, home position. The tilt cam gear
should be disengaged from the gear drive train.
Electric clutches and solenoids are used by the printer to engage rollers as needed
to move paper through the printer as well as start some print processes.
Solenoids and clutches on the print engine
Cap/wipe/purge
clutch
Transfix
solenoid
Drum maintenance
cam clutch
Upper feed-
roller clutch
Pick clutch
Air valve
solenoid
0388-08
Summary of Contents for Phaser 840
Page 11: ...xii Phaser 840 and 850 Color Printers ...
Page 65: ...54 Phaser 840 and 850 Color Printers ...
Page 101: ...90 Phaser 840 and 850 Color Printers ...
Page 125: ...114 Phaser 840 and 850 Color Printers ...
Page 134: ...Service Guide 123 Clearing PostScript NVRAM menu item ...
Page 135: ...124 Phaser 840 and 850 Color Printers ...
Page 166: ...Service Guide 155 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 9 9 ...
Page 170: ...Service Guide 159 Figure 3 Paper path FRUs 0388 80 2 1 5 11 10 9 12 6 4 3 7 13 8 11a 11b ...
Page 172: ...Service Guide 161 Figure 4 Motor and fan FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 174: ...Service Guide 163 Figure 5 Circuit board FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 81 12 7a ...
Page 176: ...Service Guide 165 Figure 6 Solenoid and clutch FRUs 4 5 3 2 1 0388 23 ...
Page 182: ...Service Guide 171 Figure 9 High capacity PaperTray 0388 65a 1 2 ...