Chapter 3. Removal And Replacement Procedures; Safety Considerations - IBM pSeries 7311 D10 Service Manual

Chapter 3. Removal and Replacement Procedures

Before performing any of the removal or replacement procedures in this chapter, read the following danger
and caution notices.

Safety Considerations

Observe the following safety precautions anytime you work with these I/O subsystems.
For the I/O subsystem you are about to setup or service:
v The ac power interface connector is considered the main power disconnect device.
v The I/O subsystems have independent redundant power supply capabilities, meaning that each unit
might be configured to have two power supplies running simultaneously in the same I/O subsystem.
When instructed to disconnect the power source, ensure that all power cables that run to each serviced
subsystem are disconnected from the power distribution bus.
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 product is equipped with a three-wire power cable and plug for the user's safety. Use this
power cable with a properly grounded electrical outlet to avoid electrical shock.
C01
CAUTION:
This unit has more than one power supply cord. To reduce the risk of electrical shock, disconnect
two power supply cords before servicing.
C21
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