Canon imagePRESS C850 Series Troubleshooting Manual page 37

2-8) Lower the Tray 1 [1] below the grate-shaped upper guide [2].
[Caution] When you attach or remove the tray, please be sure to raise the shutter [1], release the latch [3] on the rear surface of
the tray while the stack delivery gate [2] of the delivery opening is lifted (covered), and then move down the tray. If you move
down the tray without lifting the shutter of the delivery opening, the stack delivery gate comes off from the Finisher. If the stack
delivery gate comes off, remount it while paying attention so as not to lose the spring for the shaft of the stack delivery gate. The
tray falls by its own weight when the latch is released, so be sure to hold the tray with hands.
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