AT power supply

[NetDevil]

Does anybody knows the order of the wires which come into the power buton from the front of the case? The psu has 4 wires: blue, white, brown, black. The power buton has 4 places to connect the wires into sqare shape. Please help me. Thanks

 

[Zepper]

Usually the PSU itself has a switch wiring diagram right on it as the color coding of the wires may vary from mfr to mfr (but occasionally those wiring diagrams are wrong as I've found to my chagrin ). But generally you have four or five wires going to the switch from the PSU. If you have a fifth wire, it will generally be green (for Ground/Earth) and have a ring or (much less often) a spade or hook lug on the end of it. That will be fastened under a screw near the switch on the case (could even be one of the switch mounting screws). One pair of wires can be considered as extensions from the power cord bringing the power TO the switch and are usually called the SOURCE or COMMON leads - most often the NEUTRAL is white (for safe) and the HOT is black (for danger/death) - those would go on the contacts for the common (usually center) poles of the switch (is the switch a rocker or push-on/push-off?). The other pair of wires are the return wires that carry the power to the actual PSU circuitry FROM the switch - aka the LOAD leads. That pair is usually blue and brown and would go to the "Normally Open" connections on the switch - the blue is the HOT return (as people turn blue when they die from shock :shocked: ) and the brown (or sometimes white with a small color stripe in blue or brown) is the Neutral return. When you flip the switch ON, the black is connected to the blue and the white to the brown (if my color code is true for your PSU) but the concept is always the same: hot-Source to hot-Load and neutral-Source to neutral-Load.
. This should be thoroughly tested with a multimeter before applying power. The main thing is that you don't want to short the two SOURCE wires with the switch as it will not only blow the breaker on that house wiring circuit but also likely ruin the switch (unless your reflexes are rabbit-like - and probably even then ) by either welding the switch contacts together or melting them into useless balls.
. If you don't already know how to do this, you should probably get help from someone who knows!! - we don't want any crispy ATers.

.bh.