Xerox Phaser 8400 Service Manual page 303

7. Remove the Duplex Roller by removing the left KL-clip on the shaft and sliding
the left side bearing down the shaft toward the right (1) (see preceding figure).
Then slide the shaft toward the left (2) to free the right end of the shaft. Finally,
pull the shaft out towards the right side of the printer (3).
8.
Insert a T-20 Torxbit through the slotted hole in the Transfix Load Module,
engage the hole on the back of the module, and lever the module's spring cam
toward the center of the printer to release/unhook the spring hooks from the
Transfix Load Arms. Slowly relax the lever to return the spring cam to the
relaxed position.
Caution
Ensure that you lever the spring cam towards the center. Applying the
pressure in the wrong direction can damage the Transfix Load Module.
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Phaser 8400 Printer Service Manual