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5. Function Description
Via a voltage selection switch, you can adapt the ATX power pack to the present mains
voltage (230V~ or 115V~, net frequency 50/60 Hz).
The PC ATX switched mode power pack converts this mains voltage into the alternate
currents internally required by the computer (+5V, +12V, -5V, -12V and +3.3V).
An integrated fan carries off the excess heat generated during this conversion to the out-
side.
You can turn the PC ATX power pack on and off via the mains switch.
However, the computer doesn't start as soon as the mains switch is turned
on. First, both the power pack and the connected mainboard are in so-called
"standby" operation. In order to start the computer, press the power button
on the front of your ATX housing briefly. The button must be connected to
the corresponding connection on your mainboard via a cable (e.g. connec-
tion "ATX power" or similar, refer to the operating instructions for your main-
board).
When you turn your computer off with the power button, your mainboard still
carries standby voltage.
For example, this is required for switching the PC on via the keyboard or the
mouse (insofar as the BIOS of your PC provides this possibility) of the auto-
matic switching on / starting up in case of a modem/ISDN call/network
access (depending on the BIOS and software).
In case of work on your computer (e.g. if you want to install a new plug&play
card), you therefore have to turn the ATX power pack off via the mains
switch on the ATX power pack and separate it from the mains voltage.
Always pull the mains plug additionally! Otherwise the mainboard and other
components may become damaged.
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13. Pin Assignment of the Plugs
a) ATX plug
The colours of individual cables (e.g. PS ON and Power ON) might deviate.
+5V (red)
+5V (rot)
+5V (rot)
+5V (red)
-5V (white)
-5V (weiss)
GND (schwarz)
GND (black)
GND (schwarz)
GND (black)
GND (schwarz)
GND (black)
PS ON (grün)
PS ON (green)
GND (schwarz)
GND (black)
-12V (blau)
-12 (blue)
+3.3V/sense (orange)
+3.3/sense (orange)
b) 5.25" plug
+5V (red)
+5V (rot)
GND (black)
GND (schwarz)
GND (black)
GND (schwarz)
+12V (yellow)
+12V (gelb)
c) 3.5" plug
+12V (yellow)
+12V (gelb)
GND (black)
GND (schwarz)
GND (black)
GND (schwarz)
+5V (rot)
+5V (red)
+12V (yellow)
+12V (gelb)
+5V standby (violet)
+5V standby (violett)
Power OK (grey)
Power OK (grau)
GND (schwarz)
GND (black)
+5V (red)
+5V (rot)
GND (schwarz)
GND (black)
+5V (rot)
+5V (red)
GND (schwarz)
GND (black)
+3.3V (orange)
+3.3V (orange)
+3.3V (orange)
+3.3V (orange)
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