to si 16/s124, there are a power switch, a power jack and two system fans on the rear panel. the diagram is as follows.
power jack:
this is a three-phase current power jack, please use the ac power cord to connect to the power. the input voltage: 110-260 vac.50/60 hz.
system fans:
they insure the ventilation in the switch. there are some blowholes both sides of the switch. don't choke these blowholes and pay attention to leave enough places in the back and both sides of the switch.
power switch:(only to s124)
open or close power, when press power switch to " on" position, the power is opened. when to the "off" , the power is closed.