Dell PowerEdge R905 - Manual (Page 75)

Installing System Components
75
NOTE:
After installing a new power supply in a system with two power supplies,
allow several seconds for the system to recognize the power supply and determine
its status. The power-supply status indicator turns green to signify that the power
supply is functioning properly (see Figure 1-4).
Processor Expansion Module
There are two types of processor expansion module assemblies used with your
system:
• If you have a four-processor system, the processor expansion module
(PEM) contains a processor expansion module board with two processor
sockets and 16 memory module sockets.
• If you have a two-processor system, the processor expansion module shell
(PEM shell) contains an air baffle.
NOTICE:
The PEM shell must be installed in a two-processor system to ensure
adequate cooling airflow within the system.
Removing the PEM or PEM Shell
CAUTION:
Many repairs may only be done by a certified service technician. You
should only perform troubleshooting and simple repairs as authorized in your
product documentation, or as directed by the online or telephone service and
support team. Damage due to servicing that is not authorized by Dell is not covered
by your warranty. Read and follow the safety instructions that came with the
product.
1 Turn off the system, including any attached peripherals, and disconnect
the system from the electrical outlet.
2 Open the system. See "Opening the System" on page 67.
3 Lift the handle on the PEM until the PEM is fully disengaged from the
chassis. See Figure 3-7