Chapter 8. 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.
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