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Service Guide
ix
Figures
The Phaser 850 printer (shown with optional High-capacity Paper Tray Assembly) 1
Internal features of the print engine 8
Circuit boards of the print engine (right front view) 9
Circuit boards of the print engine (left-rear view) 10
The printer’s I
2
C bus 11
Printhead maintenance system of the print engine 12
Sensors and switches on the right side of the print engine 13
Sensors and switches on the left side of the printer 14
Solenoids and clutches on the print engine 15
Features of the Phaser 840 printer main board 18
Features of the Phaser 850 printer main board 18
Printer front panel 19
Phaser 840 printer rear panel 22
Phaser 850 printer rear panel 22
Attaching the service load connector to J250 62
Faceplate showing blade wipe with no drops, smudges or streaks 80
Faceplate showing streaks and smudges from a poor wipe 81
Connecting the vacuum gauge to the printer 82
Maintenance tray showing good purge 84
Damaged printhead data cable 86
Inadvertently disconnected thermistor cable connector 87
Setting process belt tension 96
Setting exit roller drive belt tension 97
Setting the Y-axis belt tension 99
Setting the Y-axis belt tension 101
Attaching the digital gap indicator 103
Spacing the printhead to the drum 104
Adjusting the x-axis scale adjustment 105
Aligning (timing) the cap/wipe/purge assembly drive belts 107
Setting the drum position encoder gap 109
Adjusting the transfix roller pressure springs 111
Connecting the vacuum gauge to the printer 112
Lubricating the transfix cam 119
Resetting print engine NVRAM menu item 122
Clearing PostScript NVRAM menu item 123
Removing the Phaser 840 printer main board 126
Removing the Phaser 850 printer main board 127
Removing the power supply 128
Removing the power control board 129
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 ...