IBM 6643, User Manual

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42
User Guide
Disconnecting cables
To disconnect cables, do the following:
1. Remove any media (diskettes or CDs) from the drives and shut down your
operating system.
2. Read the “Safety information” on page ix.
3. Read “Handling static-sensitive devices” on page 39.
4. Turn off all attached external devices and turn off the computer.
5. Unplug the computer power cord from the electrical outlet.
6. Unplug the power cords for any attached devices from their electrical outlets.
7. Disconnect all communication cables (such as modem and network cables)
from communication outlets.
8. Disconnect all other cables attached to the computer.
Removing the rear cover
You must remove the rear cover to install internal options such as memory and
PCI adapters.
Attention: Proper cooling is necessary to avoid damage to your computer. Do not
operate your computer without all covers in place.
To remove the rear cover, do the following:
1. Disconnect all cables attached to your computer. See “Disconnecting cables”.
2. Place the computer on a padded surface in the position shown in the
following illustration.
Attention:
Be sure to use a soft, padded surface such as cloth or paper towels
when positioning the computer for service. The monitor or monitor bezel
might be scratched if placed on a hard surface.
3. Pry off the four snap-on screw covers on the rear of the monitor with a flat-
blade screwdriver.
4. Remove the four screws that secure the cover to the rear of the monitor.
5. Carefully lift the cover up until it clears the metal cover over the system
board and rotate it to the position shown in the following illustration.
Attention:
When replacing the rear cover, make sure that the small coil
spring attached to the device bay release button is properly positioned
against the inside of the rear cover. The device bay release button will not
work correctly if the spring is not in the proper position.