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User Service Guide, Fourth Edition - Server Expansion Unit

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Chapter 4
Troubleshooting
Common Installation Problems
33
Interlock Switches
There are three interlock switches located in the Server Expansion Unit. Both side covers and the top cover
have an interlock switch located underneath each cover.
• Side Covers - If either side cover is removed while the system is powered on, the system fans on the front
and rear will increase in speed to ensure adequate cooling. An event code will be generated to indicate a
side cover was removed.
• Top Cover - If the top cover is removed while the system power is on, the PCI-X assembly I/O fan speed
will not change. An event code is generated to indicate the top cover was removed.