Lexmark C925 User Manual page 48

Additional printer setup
b
Reach into the lower optional tray and insert a screw, pushing it upward to the optional tray above it.
8
Plug in the electrical connections between trays.
9
Attach brackets to the back of the printer and optional trays.
a
Insert brackets on the slots located at the back of the optional trays.
b
Secure the brackets with screws.
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