Lenovo x3550 M4 Installation And Service Manual page 94

About this task
Attention: Only trained service personnel other than Lenovo service technicians
are authorized to install and remove the -48 volt dc power supply, and make the
connections to and disconnections from the -48 volt dc power source. Lenovo
service technicians are not certified or authorized to install or remove the -48 volt
power cable. The customer is responsible for ensuring that only trained service
personnel install or remove the -48 volt power cable.
Procedure
Figure 56. DC power supply rear view
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System x3550 M4 Type 7914: Installation and Service Guide
1. Read the safety information that begins on "Safety" on page vii and
"Installation guidelines" on page 33.
2. Touch the static-protective package that contains the hot-swap power supply
to any unpainted metal surface on the server; then, remove the power supply
from the package and place it on a static-protective surface.
3. Turn off the circuit breaker for the dc power source to which the new power
supply will be connected. Disconnect the power cord from the dc power
source.
4. Attach the dc power cable to the new power supply.
5. If you are installing a hot-swap power supply into an empty bay, remove the
power-supply filler from the power-supply bay.