102
Phaser 840 Color Printer
8.
Rotate the removal tool’s plastic leg into its up position. Slide the
removal tool’s standoff locks inward.
9.
Place a few sheets of paper between the printhead and the drum to
protect the drum surface.
10.
Carefully, lower the printhead removal tool onto the printhead. Rotate
the process motor to tilt the printhead forward about 2.5 cm (1 inch).
11.
Slide the standoff locks outward to secure the tool to the printhead.
Loosen the two mounting screws securing the printhead in place.
12.
Lift and remove the printhead. Lower the removal tool leg to safely rest
the printhead on a flat surface.
Installation.
If not already in place, install the printhead’s data ribbon cable to
the printhead.
1.
Using the printhead removal tool, reverse the removal steps to reinstall
the printhead.
2.
Rotate the printhead to its print position and attach the head tilt spring.
3.
Torque the mounting screws to 20 in/lbs.
4.
Install the digital gap indicator and bracket to the left side of the printer
frame and tilt arm as described in the procedure “Printhead-to-drum
spacing adjustment” on page 66. Ensure the digital indicator is set to
inches, “in.” Press
Origin
to zero the digital indicator.
5.
At the left of the printhead, insert the left printhead spacer between the
printhead and the drum. Check the indicator, it should read 0.0030
+
/
-
0.0010 inches. Adjust the printhead’s spacing adjustment by twisting a
flat-blade screwdriver in the adjustment slot to move the printhead’s
position until the indicator reads the correct value. This sets the “cold”
printhead-to-drum gap. Refer to the illustration “Spacing the printhead
to the drum,” on page 67.
6.
Remove the left printhead spacer and install the right spacer between
the printhead and the drum. Repeat the adjustment.
7.
Tighten the four locking screws in an X-pattern.
8.
Remove the head-to-media gap indicator tool and bracket.
9.
Plug the printhead’s data ribbon cable and power wiring harness into
the power control board. Inspect both ends of the data ribbon cable to
ensure they are properly seated. Reconnect the two printhead ground
wires to the printer frame.
10.
Install the ink loader.
11.
Turn on the printer.
12.
Refer to the topic “Printhead-to-drum spacing adjustment” on page 66
to set the correct gap between the “hot” printhead and the drum.
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 ...
