Compaq ProLiant 8000 ProLiant 8000 Servers Maintenance and Service Guide - Page 20

System Interlocks, Preparation Procedures, Hot-Pluggable Parts, Safety Interlock Switches

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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. Safety Interlock Switches Some earlier ProLiant 8000 upgraded servers contain safety interlock switches. These switches are located under the top cover at the top of the chassis. One safety interlock switch is located beside the removable media bay. When the cover or one of the side panels is removed from the server, the main power supply output will be disabled; however, auxiliary power (+5V) will remain in the exposed areas. The following procedures are for ProLiant 8000 upgraded servers with safety interlock switches. NOTE: This interlocking feature may be disabled upon upgrading. See the ProLiant 7000 8-way Pentium II/III Xeon servers upgrade manual for more information.

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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.
Safety Interlock Switches
Some earlier ProLiant 8000 upgraded servers contain safety interlock switches. These switches
are located under the top cover at the top of the chassis. One safety interlock switch is located
beside the removable media bay. When the cover or one of the side panels is removed from the
server, the main power supply output will be disabled; however, auxiliary power (+5V) will
remain in the exposed areas. The following procedures are for ProLiant 8000 upgraded servers
with safety interlock switches.
NOTE:
This interlocking feature may be disabled upon upgrading. See the
ProLiant 7000 8-way
Pentium II/III Xeon servers
upgrade manual for more information.