Lenovo ThinkSystem SR850 Maintenance Manual page 120

Step 1. If a power interposer and a system board air baffle are installed, remove them (see "Remove the
system board air baffle and the power interposer" on page 116).
Step 2. Install an expansion tray air baffle on the system board. Make sure it is properly installed before
installing the processor and memory expansion tray.
Figure 108. Expansion tray air baffle installation
Attention: Air baffle is required for airflow that creates proper cooling. Make sure proper air baffle
(s) for system configuration is installed before the power is turned on.
Step 3. Slightly slide power supply 2 out from the power supply bay (see "Remove a hot-swap power
supply unit" on page 93).
Step 4. Grip on the blue touch point on the handle of the expansion tray, and lift it up; then, lower the tray
vertically into the server with nailheads aligned to the slots on both sides.
Step 5. Rotate the handle all the way down. This connects and fix the expansion tray to the system board.
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ThinkSystem SR850 Maintenance Manual