Xerox Phaser 8400 Service Manual page 266

2.
On the right side of the printer, lift up on the Wiper Assembly Lock (#1 on the
figure below) to unlock the Wiper Assembly gear train.
3. Rotate the gears as shown by #2 above to lower the wiper all the way down.
4. While pulling back slightly on the printhead to keep it away from the drum
surface, unlock (push down) the right and left printhead restraint arms, #3 above,
then slowly allow the spring-loaded printhead to tilt forward.
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Phaser 8400 Color Printer
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