Functional Description - Conrad Electronic FSP400-60GLC Notice D'emploi

6. Functional Description

The ATX power supply unit has an automatic voltage detection of the existing mains voltage (115~/
230V~, 50/60Hz). This means there is no need for the error prone manual selection of the mains
voltage via a switch on the power supply unit.
The ATX power supply unit transforms this mains voltage into the internal dc voltages needed by the
computer (+5V=, +12V=, -12V= and +3.3V=).
A built-in fan extracts the excessive heat that is formed during this transformation.
The ATX power supply unit can be switched on and off via the power switch.
However, the computer does not yet start by switching on the power switch. The power
supply unit as well as the connected mainboard are in the so called "standby" mode first.
To start the computer the power button on the front side of your ATX housing has to be
pressed briefly. The button has to be connected via a cable with the corresponding
connection on your mainboard (eg connection "ATX power" or similar, see instructions
for mainboard).
If you switch your computer off via the power button (or if the operating system shuts the
computer down automatically and switches it off), there is still a standby voltage on your
mainboard.
This is necessary for, eg switching the computer on via the keyboard or mouse (if the
BIOS of your computer provides this option) or for the automatic switching on/booting of
a modem/ISDN call/network access (irrespective of BIOS, hardware and software).
This is why if there are interventions on your computer (eg if you want to install a new plug-
in card), the ATX power supply unit has to be switched off beforehand on the mains switch
which is on the ATX power supply unit and it has to be separated from the mains voltage,
always also pull the mains plug! Otherwise the mainboard and other components as well,
may get damaged!
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