Lenovo System x3750 M4, Installation And Service Manual, Page: 113 / 982

Note: If the grease is properly applied, approximately half of the grease will remain in the syringe.
Step 6. Install the heat sink onto the microprocessor as described in Step 11 “Replacing a microprocessor
and heat sink” on page 97.
Installing power supplies
This topic provides information about the installation of the 750-watt dc, 900-watt, and 1400-watt hot-swap
power supply.
This server comes with one 750-watt dc power supply, one 900-watt power supply or one 1400-watt power
supply (depending on the model). This server supports up to two redundant power supplies. For the server
to support two power supplies, you must install the optional Power Interposer for Redundant Power option
or the optional Microprocessor and Memory Expansion Tray.
Note: You cannot use ac and dc power supplies in the same server.
Installing a 1400-watt or 900-watt hot-swap power supply
Use this information to install a 1400-watt or 900-watt hot-swap power supply.
The following notes describe the type of power supply that the server supports and other information that
you must consider when you install a hot-swap power supply:
• To confirm that the server supports the power supply that you are installing, see
http://www.ibm.com/systems/info/x86servers/serverproven/compat/us/.
• The server comes standard with one 900-watt (input voltage 110 or 220 V ac auto-sensing) hot-swap
power supply or one 1400-watt hot-swap power supply (input voltage 110 or 220 V ac auto-sensing)
depending on your model.
Note: Do not mix 110 V ac and 220 V ac input voltage power supplies in the server. It is not supported.
• Do not mix 900-watt and 1400-watt power supplies in the server. It is not supported.
• These power supplies are designed for parallel operation. In the event of a power-supply failure, the
redundant power supply continues to power the system. The server supports a maximum of two
power supplies.
• Full N+N redundacy support is provided by two 1400-watt power supplies fed from a 220 V input source.
• Limited N+N redundancy support is provided by two 900-watt power supplies fed from either a 110 V or
220 V input source, or by two 1400-watt power supplies fed from a 110 V source.
• For the server to support two power supplies, you must install the optional Power Interposer for
Redundant Power option or the optional Microprocessor and Memory Expansion Tray, if one is not
installed in your model.
Statement 5
CAUTION:
The power control button on the device and the power switch on the power supply do not turn off
the electrical current supplied to the device. The device also might have more than one power
cord. To remove all electrical current from the device, ensure that all power cords are disconnected
from the power source.
Chapter 2
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Installing optional devices
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