This connector became the standard for 5.25-inch format peripherals such as hard drives and was used until introduction of SATA drives. The first 5.25-inch floppy disk drive, the Shugart SA400, introduced in August 1976, used the AMP Mate-n-Lok connector part number 350211-1. Both were widely used in the computer industry and the term "Molex connector" is often inaccurately used to refer to all nylon plugs and receptacles. The AMP connector was similar to the patented Molex connectors but not interchangeable. In October 1963, AMP (now TE Connectivity) introduced the Mate-n-Lok connector. Molex Disk Drive Power Connection System tool and connectors Because the pins have a large contact surface area and fit tightly, these connectors are typically used for power. The 1.57 mm pin can carry 5 A of current, while the 2.36 mm can carry 8.5 A. Pins and sockets can be arranged in any combination in a single housing, and each housing can be either male or female. The connector typically has 2 to 24 contacts and is polarized or keyed to ensure correct orientation. The pins and sockets are held in a rectangular matrix in a nylon shell. In such a connector, cylindrical spring-metal pins fit into cylindrical spring-metal sockets. First used in home appliances, other industries soon began designing it into their products from automobiles to vending machines to minicomputers. Molex developed and patented the first examples of this connector style in the late 1950s and early 1960s. Pioneered by Molex Connector Company, the two-piece design became an early electronic standard. Molex connector is the vernacular term for a two-piece pin and socket interconnection. Now disconnect the large 4 pin (4x1) molex from the CD/DVD drive and disconnect the large 4 pin (4x1) molex from the (IDE) hard drive.AMP Mate-n-Lok and Molex Standard 0.093-inch pin and socket power connectors Then disconnect the 4 pin (2x2) molex plug from the motherboard and the 6 pin (3x3) molex plug from the video card. On newer motherboards there will be an extra 4 pins (2x2) for a total of 24 pins. Start out by disconnecting the P1 (10x2) 20pin plug. Now that you are inside the case, unplug all of the power cords that are plugged into the motherboard and other components. There are lots of different cases out there please refer to you case documentation if you are having trouble. Now remove the 2 screws that are holding the cover in place on the left side and slide it off. You will need a Phillips screwdriver to do this. Here we are using a standard mid tower case and will only be removing the left side to access the computer. Once this is done, you will open the case to your computer. When replacing a power supply one of the first things you want to do is unplug the computer from the wall and remove the power cable from the back of the computer/power supply. If your power supply is still good you will need to reconnect everything and make sure the computer boots up fine and still works. At this point, if you have determined that your power supply is not working properly you will want to replace it. Then turn off the power supply by using the switch on the back of the power supply by turning it to the off position and don’t forget to unplug the P1 plug from the motherboard. Once you have finished testing remove the probes from the P1 plug and turn off your meter. The yellow wire is a 12 volt wire and should read somewhere between 10.8 volts and 13.2 volts. Now remove the red probe from the red wire and connect it to the yellow wire. Once again since this is a red wire, it is a 5 volt wire and should read somewhere in the range of 4.5 to 5.5 volts. Then place the red probe into the red wire. The blue wire is a (negative) -12 volt wire and should read somewhere between -10.8 volts to -13.2 volts. Now test the blue wire by removing the red probe from the orange wire and sliding it into the P1 plug where the blue wire is. Since the orange wire is a 3.3 volt wire it should read somewhere between 3.0 volts and 3.63 volts. Start by testing the orange wire by placing the red probe into the back of the P1 plug where the orange wire is. Once the ground is in place you can leave it there while we test the other wires. Now to test the P1 (10x2) 20 pin plug you will want to slide the black probe into one of the black (ground) wires in the back of the P1 plug while it is still connected. Make sure it goes down far enough to make contact.
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