HP ProLiant 4500 Compaq ProLiant 4500 Servers Maintenance and Service Guide - Page 14

Preparation Procedures, Power Supply Safety Interlock

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2-2 Removal and Replacement Procedures PREPARATION PROCEDURES Before beginning any of the removal and replacement procedures, complete the following steps: 1. Turn the computer and any peripheral devices off. 2. Disconnect the AC power cord from the AC outlet, then from the server. 3. Disconnect all external peripheral devices from the server. POWER SUPPLY SAFETY INTERLOCK The Compaq ProLiant 4500 Server is equipped with a safety interlock switch to minimize the risk of exposure to high voltage and maintain proper air flow for cooling of the processor and mass storage devices. When the side access panel is removed, the power supply is automatically disabled. This safety feature can be defeated with a Service Maintenance Key (Spares Part Number 148757-001) if power is required when servicing the server with the side access panel removed. WARNING: High voltage present. Extreme care must be taken when running the Compaq ProLiant 4500 Server with the system unit cover removed and the safety interlock defeated. CAUTION: The Compaq ProLiant 4500 Server should always be operated with the system unit cover on. Proper cooling will not be achieved with the system unit cover off. Figure 2-1. Power Supply Interlock Defeat Maintenance and Service Guide

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2-2
Removal and Replacement Procedures
Maintenance and Service Guide
PREPARATION PROCEDURES
Before beginning any of the removal and replacement procedures, complete the following steps:
1.
Turn the computer and any peripheral devices off.
2.
Disconnect the AC power cord from the AC outlet, then from the server.
3.
Disconnect all external peripheral devices from the server.
POWER SUPPLY SAFETY INTERLOCK
The Compaq ProLiant 4500 Server is equipped with a safety interlock switch to minimize the risk
of exposure to high voltage and maintain proper air flow for cooling of the processor and mass
storage devices.
When the side access panel is removed, the power supply is automatically
disabled.
This safety feature can be defeated with a Service Maintenance Key (Spares Part
Number 148757-001) if power is required when servicing the server with the side access panel
removed.
WARNING:
High voltage present.
Extreme care must be taken when running
the Compaq ProLiant 4500 Server with the system unit cover removed and the
safety interlock defeated.
CAUTION:
The Compaq ProLiant 4500 Server should always be operated with
the system unit cover on.
Proper cooling will not be achieved with the system
unit cover off.
Figure 2-1.
Power Supply Interlock Defeat