Sun Microsystems Fire V890 Service Manual page 154

4. Replace the eight Phillips screws that secure the I/O board to the centerplane.
a. Insert the top center screw and tighten it by two turns.
b. Insert the screw directly beneath the top center screw and tighten it by two
turns.
c. Insert the top left and right screws and tighten them by two turns.
d. Insert the remaining screws and tighten them by two turns.
e. Fully tighten the screws in the pattern described until the board is fully seated.
126 Sun Fire V890 Server Service Manual • October 2005