Figure 3-4 Removing The Cpu Board From The Indigo Chassis - Silicon Graphics IRIS Indigo Owner's Manual

Chapter 3: Installing Memory
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4. Remove the CPU board.
You see two boards inside the Indigo chassis; the left board is the CPU board and is
labelled CPU.
Two levers hold the board in place.
Pull the levers toward you to release the board. The board slides out of the
chassis as you pull the levers, as shown in Figure 3-4.
Figure 3-4 Removing the CPU Board From the Indigo Chassis
Slide the board out of the slot and set it down on a flat, anti-static surface (such
as a clean, dry desktop), so the side with the large chips on it faces up.