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Phaser 840 and 850 Color Printers
Printhead-to-drum spacing adjustment (Phaser 840 printer)
This procedure assures that the printhead is the proper distance from the drum.
Make this adjustment after removing or replacing the printhead. The Phaser 850’s
printhead mounts are factory calibrated; no printhead-to-drum calibration is needed. If
calibration is ever required, follow the Phaser 840 printhead-to-drum adjustment.
1.
Remove the top cover. Remove the metal heat cover.
2.
Tilt the printhead to its print position and, if removed, attach the head
tilt spring.
3.
For the “hot” adjustment, scroll to the printer’s hidden service support
menu. Activate the diagnostic’s Printhead to Drum Gap Adjustment
(Hot) routine. The routine automatically centers the printhead, and
brings the printhead and drum to their operating temperatures.
4.
Lift the ink loader up and back slightly so that the printhead can be
accessed. Do not unplug the printhead.
5.
If not already tightened, tighten the printhead mounting screws to
20 in- lbs.
6.
If not already loose, loosen the printhead’s four locking screws (two at
each end of the printhead) until they are just snug in place.
Tool required
■
Printhead-to-drum gap tools
■
Small (3/16 in.) flat-blade screwdriver
■
9/64 in. hex tip
■
Magnetic screwdriver
■
T-20 TORX tip
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 ...