Compaq ProLiant 8000 ProLiant 8000 Intel Pentium III Xeon 700MHz Servers Maint - Page 20

System Interlocks, Preparation Procedures, Hot-Pluggable Parts

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Removal and Replacement Procedures 2-3 System Interlocks Compaq ProLiant 8000 servers ship with system interlocks. System interlocks consist of three LEDs providing a closed-loop checking mechanism for verifying proper cabling interconnects between critical server components. These LEDs are located on both the I/O and the processor boards. They provide a visual aid to assist in isolating components to check if the server will not power up because of a broken interlock chain. The I/O board is located directly beneath the PCI Hot Plug access doors under the top access panel. An amber system power LED on the front of the server will illuminate whenever the interlock chain is broken. Preparation Procedures Hot-Pluggable Parts Before beginning the removal of any serviceable parts, determine whether the part is hot-pluggable or non-hot-pluggable. If it is hot-pluggable, do not perform a power shutdown of the server. The access panels can be removed while the server is powered up without causing a system shutdown. When the server is in Standby mode, portions of the power supply, auxiliary power (+5V), and some internal circuitry will remain active. Non-Hot-Pluggable Parts If any serviceable parts are non-hot-pluggable, then the server must be shut down. Non-hot-pluggable parts include the processor, Processor Power Module, system board, memory board, and DIMMs. Refer to "Turning Off the Server" later in this chapter for complete instructions. WARNING: To reduce the risk of injury from electric shock, remove all power cords to completely disconnect power from the system. Power supplies marked with these symbols indicate the equipment is supplied by multiple sources of power.

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Removal and Replacement Procedures
2-3
System Interlocks
Compaq ProLiant 8000 servers ship with system interlocks. System interlocks consist of three
LEDs providing a closed-loop checking mechanism for verifying proper cabling interconnects
between critical server components. These LEDs are located on both the I/O and the processor
boards. They provide a visual aid to assist in isolating components to check if the server will not
power up because of a broken interlock chain. The I/O board is located directly beneath the
PCI Hot Plug access doors under the top access panel. An amber system power LED on the
front of the server will illuminate whenever the interlock chain is broken.
Preparation Procedures
Hot-Pluggable Parts
Before beginning the removal of any serviceable parts, determine whether the part is
hot-pluggable or non-hot-pluggable. If it is hot-pluggable, do not perform a power shutdown of
the server. The access panels can be removed while the server is powered up without causing a
system shutdown. When the server is in Standby mode, portions of the power supply, auxiliary
power (+5V), and some internal circuitry will remain active.
Non-Hot-Pluggable Parts
If any serviceable parts are non-hot-pluggable, then the server must be shut down.
Non-hot-pluggable parts include the processor, Processor Power Module, system board,
memory board, and DIMMs. Refer to “Turning Off the Server” later in this chapter for complete
instructions.
WARNING:
To reduce the risk of injury from electric shock, remove all power
cords to completely disconnect power from the system. Power supplies
marked with these symbols indicate the equipment is supplied by multiple
sources of power.