Xerox Phaser 840 Service Manual page 164

Loosen the four locking screws 1/2 turn. Insert a screwdriver into the printhead
8.
adjustment slot and twist the screwdriver to adjust the printhead forward until the right
gap clip is tight against the drum.
Insert flatblade
screwdriver in
adjusting slot.
Use a twisting
motion to move
the printhead.
Gap clip
Fig 4-7 Drum adjustment
Perform the same adjustment at the left side of the printhead until the left gap clip is
9.
tight against the drum.
Repeat both the right-side and left side adjustments to ensure that both ends of the
10.
printhead are tight against the drum.
Snug (not tighten) the four locking screws using an Z-pattern starting with the rear
11.
screws. Then tighten the four screws, using the same Z-pattern, to 20 in./lbs.
Remove the adjustment tension spring.
12.
Because the gap clips mount directly to the printhead, they are
Warning
very hot. To avoid injury when removing them from the printer, do
not touch the metal areas on the clips.
Tilt the printhead back and carefully remove the gap clips. Tilt the printhead forward
13.
once the clips are removed
Reinstall the ink loader and metal heat cover.
14.
Select Adjustment Complete from the front panel to exit the "Head-to-Drum Adjust"
15.
sequence. Reinstall the top cover.
Print service test print 11: Head to Drum Check to check alignment. This print
16.
indicates if the gap between the printhead and the drum is correct. Refer to "Test
Prints", on page 5-159".
Refer to Service Bulletin 447 for additional information.
Note
4 - 148 Phaser 840/850/860/8200 Color Printer - Service Manual
Tighten locking
screws when
both left and right
adjustments are
complete
Use screwdriver in
adjusting slot to push
printhead and gap clip
tightly against drum
Printhead in
print position
Repeat adjustment
at this end of
printhead
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