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22 IBM Netfinity EXP300 - Type 3531 Hardware Maintenance Manual
Installing a hot-swap power supply / fan unit
Complete the following steps to install a hot-swap power supply:
1. Ensure that the power supply you are installing is turned off.
2. Grasp the handles2and slide the power supply into the expansion unit.
3. Tighten the power supply thumbscrews 1.
4. Connect the power cord to the power supply.
5. Plug the supply power cord into a properly grounded electrical outlet.
If you just installed a second (redundant) supply, the fault (amber) LED will light
because its power switch is turned off.
6. Turn on the power supply.
If you just installed a second (redundant) supply, after you turn on the power, the
fault (amber) LED will turn off and the ac and dc power (green) LEDs will turn
on.
Working with cards and boards
The expansion unit bridge card, switch card, and ESM boards are customer
replaceable units (CRUs). This section contains step-by-step instructions for removing
and replacing each device.
Replacing a bridge card
To replace the bridge card CRU in the EXP300 expansion unit, follow the instructions
for removing the bridge card and installing a bridge card.
Before you begin
• Read the safety and handling guidelines provided in “Safety information” on
page 41 and "Handling electrostatic discharge-sensitive devices."
• Ensure that your current system configuration is working properly.
• Back up all important data before you make changes to storage devices, such
as hard disk drives.
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