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Chapter 9. Removal and Replacement Procedures
This chapter provides removal and replacement procedures for the Model 275.
Notes:
1. Before performing any of the removal or replacement procedures in this chapter, read the following
danger and caution notices.
2. If your system has a failure for one of the listed devices, refer to Chapter 11, "Component and
Attention LEDs," on page 309. When you have determined that the device is the source of the
problem, return to these procedures.
In the system you are about to set up or service:
v The ac power interface connector is considered the main power disconnect device.
v This system has redundant power supply capabilities, meaning that it has the ability to have two power
supplies running simultaneously in the same system unit. When instructed to disconnect the power
source, ensure that all power cables have been unplugged.
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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