Maintaining Hardware; Replacing A Power Module - 3Com 7754 Installation Manual

6
Replacing a Power
Module
Removing the AC Power
Module
Installing the AC Power
Module
M
AINTAINING
This chapter covers the following topics:

Replacing a Power Module

■
Replacing a Power Supply
■
Replacing I/O Modules
■
Replacing the Fan Assembly
■
The procedures in this chapter should be performed by trained service personnel
only.
To replace a power module, you need:
An antistatic wrist strap
■
A screwdriver
■
WARNING: Insure that the switch is powered off before removing or installing a
power module.
To remove the power module, do the following:
1 Power off the Switch 7750.
2 Remove the power cord from both the power module and the AC power socket.
3 Loosen the retaining screw that secures the power supply on the lower right front
of the power supply.
4 Remove the power supplies approximately 2 inches (5 cm) from the chassis to
disconnect the power supply AC connectors from the AC power module.
5 Loosen and remove the 4 screws at the corners of the power module.
6 Remove the power module from the chassis.
To install the new power module, do the following:
1 Slide the replacement power module into the power module slot in the bottom
rear of the chassis.
2 Insert and tighten the 4 screws at the corners of the power module.
3 Reconnect the power supplies to the power module.
4 Tighten the retaining screw on the lower right front of the power supply.
5 Connect 2 power cords to the power module.
H
ARDWARE