Chapter 3. Removal And Replacement Procedures; Safety Notices; Operating System Shutdown; Power-On Procedure With The Ac Power Distribution Bus - IBM T00 Service Manual

Chapter 3. Removal and Replacement Procedures

This chapter contains information about powering the rack on and off, and removing and replacing
components.
Use the correct power-on and power-off procedure for the type of power distribution used in your rack.

Safety Notices

This section contains safety notices that apply to all the procedures in this chapter. Review this section
carefully before performing any power-related operations.
DANGER
An electrical outlet that is not correctly wired could place hazardous voltage on metal parts of
the system or the devices that attach to the system. It is the responsibility of the customer to
ensure that the outlet is correctly wired and grounded to prevent an electrical shock.
Before installing or removing signal cables, ensure that the power cables for the system unit
and all attached devices are unplugged.
When adding or removing any additional devices to or from the system, ensure that the power
cables for those devices are unplugged before the signal cables are connected. If possible,
disconnect all power cables from the existing system before you add a device.
Use one hand, when possible, to connect or disconnect signal cables to prevent a possible
shock from touching two surfaces with different electrical potentials.
During an electrical storm, do not connect cables for display stations, printers, telephones, or
station protectors for communications lines.
D05
CAUTION:
This unit has more than one power supply cord. To reduce the risk of electrical shock, disconnect
two power supply cords before servicing.
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Operating System Shutdown

Before powering off any drawers or external devices, ask the customer if this rack is used in a
high-availability system. If it is, notify the customer that other attached systems might be affected by this
procedure.
Notify the customer if you are going to turn off power to any drawers that are attached to drawers or
devices in another system.
Before powering off the system unit, you must first shut down the operating system to prevent losing data.
Ask the customer to shut down all programs. Failure to do so can result in the loss of data. See your
operating system documentation for information about the shutdown command.

Power-On Procedure with the AC Power Distribution Bus

This section covers the ac rack power-on procedures.
1. Plug all drawer power cables into the outlets on the ac power distribution bus or buses.
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