Xerox Phaser 8400 Service Manual page 269

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.
9.
Disconnect the heater harness plug and free the harness (see the following figure)
from its restraint.
Service Manual
Printhead shaft
Roll block
s8400-150
8-17