(16) Positive Terminal.
(17) Negative Terminal.
(18) Ground Terminal: this is connected to the case.
(19) Cooling fan: the fan is turned on briefly when the power supply is energized; afterwards it is turned on when
internal temperature of the power supply rises above 45℃.
(20) AC voltage selector switch: use this switch to select the input AC of either 110V or 220V for select models.
Warning: To avoid electrical shock, the power plug ground pin must be connected to AC ground.
Warning: the voltage indicated on the power supply must match the AC voltage, otherwise the power supply
will be damaged (plugging a power supply rated for 110V into 220V AC), or the maximum output would not be
reached (plugging a 220V power supply into 110V AC).
(21) AC Input. For power supply models not equipped with air switch, the fuse is located here. To replace the fuse,
remove the AC power cord, and use a flat head screwdriver to remove the fuse holder.
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