Installation Procedures 
1  Set the Power switch 
on 
the system unit to Off. 
(If 
the expansion unit is attached, also set its 
Power switch to Off.) 
2  Set the Power switches 
on 
all external devices to 
Off. 
3   Unplug the system unit's power cord from the 
wall outlet. (If the expansion unit is attached, 
also unplug its power cord.) 
4   Unplug all external-device power cords from the 
wall outlets. 
o 
Option Installation 
4-7