Xerox Phaser 840 Service Manual page 214

If not already in place, install the printhead's data ribbon cable to the
Installation.
printhead.
Using the printhead removal tool, reverse the removal steps to reinstall the printhead.
1.
Rotate the printhead to its print position and attach the head tilt spring.
2.
Torque the mounting screws to 20 in./lbs.
3.
Be careful not to spill ink out of the hot printhead.
Caution
For the Phaser 840 only, refer to "Printhead-to-drum spacing adjustment (Phaser 840
Printer Only)", on page 4-146.
Plug the printhead's data ribbon cable and power wiring harness into the power control
4.
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.
Install the ink loader.
5.
Plug in the printer and turn on.
6.
7 - 198 Phaser 840/850/860/8200 Color Printer - Service Manual