Xerox Phaser 8400 Service Manual page 302

7.
Remove left and right printhead restraints. First remove the screw, then pull
inward towards the printhead, then lift up and slightly toward the rear of the
printer to remove (see figure below).
Printhead Restraint
Note
Adjust printhead position as required to remove the right restraint.
8. Remove the Roll Block on the left end of the printhead shaft.
Caution
The roll block may be hot if the printer was just shut down.
8-14
torque to 6 in/lbs (1 N-m)
Printhead Shaft
Roll Block
Phaser 8400/8500/8550 Color Printer
Printhead Restraint
When reassembling,
s8500-075
s8500-076