Xerox Phaser 840 Service Manual page 207

Reverse these steps to reinstall the drum/transfix assembly. Upon reassembly, install the
hex-keyed screws first; they align the drum/transfix assembly to the engine frame.
Make these adjustments after installing a new drum.
Ensure the drum position encoder sensor gap is correct.
a.
Lubricate the transfix cam as described in the topic "Lubrication", on
b.
page 6-177.
Set the Y-belt tension; refer to the topic "Y-axis belt tension adjustment
c.
(Phaser 840 printer)", on page 4-142 or "Y-axis belts tension adjustment
(Phaser 850/860 printer)", on page 4-144.
Power up the printer in Bypass Mode to skip the startup and mud pages.
d.
Select service test print 10: Manufacturing Paper Path to verify the
e.
paper path and that all ink jets operate.
Print service test print 9: Seal Drum to seal the new drum.
f.
Phaser 840 printer only: Perform the printhead-to-drum adjustment
g.
described in the topic "Printhead-to-drum spacing adjustment (Phaser 840
Printer Only)", on page 4-146 or "Drum position encoder gap", on
page 4-152
Removal and Replacement Procedures 7 - 191