Nortel Networks BCM200/400 - Manual (Page 305)

Chapter 23 Replacing or upgrading a power supply 305
BCM200/400 4.0 Installation and Maintenance Guide
If you are replacing a single faulty power supply module, the BCM400 is already in operation.
The replacement power supply module powers up when fully and correctly inserted in the
redundant power supply cage.
5 Verify the LEDs on the power supply module are lit. Verify all LEDs on the base function tray
indicate the system functions correctly.
Removing a power supply module
Use this procedure for any of the following conditions:
• Remove a single failed power supply module. A redundant power supply module indicates a
failure when the green LED, located on the power supply module, is not lit. A standard power
supply module does not have a green LED.
• Remove power supply modules before you install a new power supply cage in the BCM400
main unit (see
“Upgrading to a redundant power supply” on page 294 ).
To remove a power supply module
1 Unfasten the power supply module locking nut. When the nut is fully unfastened, the nut
should move freely in the screw cage.
2 Swing the power supply module handle to a 90 degree angle to the power supply module.
3 Grasp the power supply module handle. With your thumb, compress the locking tab toward the
handle.
4 Pull the power supply module out of the power supply cage (see notes in this step).
• If you are replacing a faulty power supply module, power down the power supply module.
Partially remove the power supply module from the power supply cage. Do not
completely remove the power supply module.
• If you are installing the redundant power supply for the first time, remove both power
supply modules from the redundant power supply cage. Remove the power supply
modules before you install the power supply in the platform base chassis (see
Figure 160 ).
Note: It is not necessary to remove power from the BCM400 main unit or expansion unit
to replace a single power supply module.
Warning: Protect the hardware components against damage from electrostatic discharge.
Always wear a grounded wrist strap before you handle components. Always place the
components in a static-free container.
Warning: When the power is on, wait several seconds before removing the
power supply module completely from the power supply cage to ensure complete
electrical discharge.