IBM 6643 - Manual (Page 30)

Note:
1. Before servicing, disconnect all cables attached to the computer.
2. For proper cooling, do not operate the computer without all covers in place.
3. When placing the monitor on a flat surface, place it on a padded surface such as cloth
or paper towels to protect the monitor and monitor bezel from scratches.
1. Turn off the computer and all attached devices.
2. Unplug the power cord.
3. Pry off the four snap-on screw covers.
4. Unscrew the four captured screws.
5. Carefully lift rear bucket housing up to clear the rear EMC cover and rotate it
to the position as shown.
Note:
When replacing the rear bucket housing assembly, make sure 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.
Upper base cover and base cover wing removal
1. Remove the upper base cover by pulling out on the rear bottom part of the
cover.
2. Gently pry the two base cover wings from the hinge stand assembly. Note the
positions of the plastic tabs 1 .
22 Hardware Maintenance Manual