IBM 6648 - Manual (Page 205)

v Disconnect the attached power cords, telecommunications systems,
networks, and modems before you open the device covers, unless
instructed otherwise in the installation and configuration procedure
s.
v Connect and disconnect cables as described in the following table when
installing, moving, or opening covers on this product or attached devices.
To Connect To Disconnect
1. Turn everything OFF.
2. First, attach all cables to devices.
3. Attach signal cables to connectors.
4. Attach power cords to outlet.
5. Turn device ON.
1. Turn everything OFF.
2. First, remove power cords from outlet.
3. Remove signal cables from connectors.
4. Remove all cables from devices.
v Statement 2
CAUTION:
When replacing the lithium battery, use only IBM Part Number 33F8354 or
an equivalent type battery recommended by the manufacturer. If your
system has a module containing a lithium battery, replace it only with the
same module type made by the same manufacturer. The battery contains
lithium and can explode if not properly used, handled, or disposed of.
Do not:
v Throw or immerse into water
v Heat to more than 100°C (212°F)
v Repair or disassemble
Dispose of the battery as required by local ordinances or regulations.
v Statement 3
Chapter 4. Related Service Information 191