Lenovo THINKSERVER 3821 - Manual (Page 166)

2. If you are planning to view the error LEDs that are on the system board and
components, leave the server connected to power and go directly to step 5.
3. Turn off the server and all attached devices.
4. Disconnect all external cables and power cords.
5. Using the supplied key, unlock the left-side cover.
6. Pull the cover-release latch down and rotate the top edge of the cover away
from the server.
Attention: For proper cooling and airflow, replace the cover before you turn
on the server. Operating the server for extended periods of time (more than 30
minutes) with the cover removed might damage server components.
7. Remove the left-side cover from the server.
Installing the left-side cover
To install the left-side cover, complete the following steps:
1. Set the bottom edge of the left-side cover on the bottom ledge of the server.
2. Rotate the top edge of the cover toward the server and press inward on the
cover until it clicks into place.
3. Lock the cover, using the key that comes with the server.
Opening the power-supply cage
Opening the power-supply cage allows access to the air baffle, microprocessors,
and DIMMs. To open the power-supply cage, do the following:
1. Read the safety information that begins on page 5.
2. Turn off the server and peripheral devices, and disconnect the power cords and
all external cables.
158 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual