Lexmark C734 Service Manual page 343

6.
Replace the system board.
a.
Place the system board in position.
Check that the mirror motor cable and the printhead cable do not rub against the edges of the frame.
b.
Replace the nine screws (F) in the system board in the following order:
•
Loosely attach the four corners (F1) in a clockwise order, beginning with the left top corner.
•
Replace the USB connector screw (F2).
•
Loosely attach the left center side, top center, and right center side (F3).
•
Tighten the top left corner and top right corner.
•
Replace the two screws on the center bottom (F4).
•
Tighten the bottom left and bottom right corners (F1).
c.
Route the cables through the access holes on the right side of the printer.
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Repair information