HP Netserver L Server series - Manual (Page 61)

Chapter 6 Installing an Additional Processor
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c. While holding the heatsink down with one hand, push down with your
thumb to hook the tab with the thumb latch. See Figure 6-6.
Hold
Down
Step C
Tool
Latch Hook Latch
Step B
Figure 6-6. Setting the Latches
CAUTION Failure to re-install the air duct will cause the Netserver to
shut down with no messages displayed and possible damage
to the processor.
5. Replace the air duct on the system board and tighten the captive screws.
See Figure 6-7.