Lenovo System x3550 M4 Installation And Service Manual page 273

Step 9. Turn on the circuit breaker for the dc power source to which the new power supply is connected.
Step 10. Make sure that the green power LEDs on the power supply are lit, indicating that the power supply
is operating correctly.
Step 11. If you are replacing a power supply with one of a different wattage in the server, apply the new
power information label provided over the existing power information label on the server. Power
supplies in the server must be with the same power rating or wattage to ensure that the server
will operate correctly.
Figure 174. Power information label
Step 12. If you are adding a power supply to the server, attach the redundant power information label that
comes with this option on the server cover near the power supplies.
Figure 175. Redundant power information label
Removing the hot-swap drive backplane
Use this information to remove the hot-swap drive backplane.
To remove the hot-swap hard disk drive backplane, complete the following steps:
Step 1. Read the safety information that begins on "Safety" on page v and "Installation guidelines"
on page 31.
Step 2. Turn off the server and peripheral devices and disconnect the power cords and all external cables,
if necessary.
Step 3. Remove the cover (see "Removing the cover" on page 189).
Step 4. Pull the hard disk drives out of the server slightly to disengage them from the hard disk drive
backplane (see "Removing hot-swap hard disk drives" on page 198).
Step 5. Remove the hot-swap hard disk drive backplane.If you would like to remove the 3.5-inch drive
backplane.
.
Chapter 6 Removing and replacing components
259