Pc power supply voltage tester

Three common ATX power to motherboard connector configurations, a 20 pin connector, a 20 +4 pin connector, and a 24 pin connector. The 20-pin Main power connector is standard for all power supplies conforming to the ATX and ATX12V 1.x form factors, and consists of a Molex Mini-Fit, Jr. The total power handling capacity of this connector is only 251 watts, which is lower than many systems need today. Technically this is also possible to do, however, you risk overloading the 20 pin connector.
The 4-pin +12V power connector is specified for all power supplies conforming to the ATX12V form factor, and consists of a Molex Mini-Fit, Jr. The old AT style power supplies could easily be turned on when not connected to a motherboard because the switch was mechanical.
To turn on an ATX power supply not connected to a motherboard short between the green and black wires on the 20 or 24-pin connector, with a paper clip or piece of wire. The original PC starting in 1981 used two cables (Molex 90331) to connect the power supply to the motherboard. On an AT system the power supply delivered a majority of power at 5 volts since most of the motherboard ran at that voltage. When more amperage is required by the motherboard before the 24 pin connector was devised, this six pin inline connector was equipped with power supplies to provide supplemental power to the motherboard.

For the power LED indicator, insert the connector with the colored wire into the header with the '+' mark. Computer power supply units (PSU) deliver the power to the PC hardware via a number of cables with connectors.
Standard ATX power supplies typically have the main power connector P1, additional 12V connectors, as well as peripheral, floppy drive, serial ATA, and PCI ExpressA® receptacles, which we will describe below.
Under normal operation, PS_ON# is activated when you press and release the computer power button while it is in standby mode. Also note that many brands such as Apple's Power Mac, Dell (during certain years), Compaq and HP used proprietary boards with entirely different pin designations- see this for info on some brand name power supplies.
All voltages are referenced to the same common (if you need to measure any voltage, connect the return lead of your voltmeter to any of the COM contacts).
When the industry began using voltage regulation modules (VRM) running off 12V2 to energize CPU and other motherboard components, the bulk of the wattage shifted to 12 volt buss. Some units may also have an optional 2x3 socket that can be used for auxiliary functions, such as fan monitoring and control, IEEE-1394 power source, and a remote sense of 3.3 V. They connected side by side into the motherboard, and they could easily be reversed accidentally, or inverted which will result in damage to the motherboard. Their generic specifications for various desktop systems are defined in Intel's design guides, which are periodically revised.

Most of today's motherboards supply their CPU with a separate 12 volt cable, which has 4 pins for ATX style (sometimes called P4) or 8 or more pins for EPS and non-standard high-power systems. For reference, the connector is Molex part number 39-01-2200 and the terminals are part number 5556.
For reference, the connector is Molex part number 39-01-2040 and the terminals are part number 5556. This is the same style of connector as the ATX Main power connector, except with fewer pins. Accordingly, different ATX-style PSU may use different number of power wires: see the pinout diagram to the right. Well, under certain conditions a new PSU can still be used with an old PC and vise versa- see our guide on connecting 20-pin PSU to 24-pin motherboard.

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