IBM F50 RS/6000 7025 - Manual (Page 245)

Replacing the I/O Planar Cover
1. Place the lip at the top of the I/O planar cover over the top of the system adapter
housing. Push the bottom of the I/P planar cover in, aligning the key on the
system with the key slot on the cover. Replace the I/O planar cover.
2. Latch the cover and tighten the three screws.
Chapter 5. Installing Options 5-101