Xerox Phaser 8400 Service Manual page 312

6.
Slide the Preheater off the shelves and out of the printer as shown by (3).
Note
Phaser 8500/8550 preheater is more difficult to slide out than the Phaser 8400
preheater because there is less clearance with the Preheater Lift solenoid.
Replacement Note:
Note
The fingers on the Inner Simplex Guide, go over the segmented roller. First
snap the left retainer into place, then the right.
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Latches
Phaser 8400/8500/8550 Color Printer
s8500-085