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ATX Computer Power Supply Tester Overview The Tenma Model 72-1084 ATX Power Supply Tester is designed to provide fast convenient verification of proper operation of ATX style computer power supplies. Connecting an ATX 20-pin connector to CON1 of this tester will provide immediate visual indication of operation of the power supply. This tester also includes an analog voltage meter to verify correct voltage of the +3.3V, +5V, and +12V pins on this connector. Three separate connectors also allow verification of proper output voltage on the peripheral power, floppy drive power and +12V CPU power connectors. Operation Typically, ATX style power supplies are switched on/off from the motherboard. The Tenma ATX Power Supply Tester simulates this command by placing a proper current load across Pin4 and Pin5 of the 20-pin ATX connector. When its rocker switch is placed in the ON position, the power supplies cooling fan will engage, and the LED indicator, located in the tester rocker switch, will light. This indicates that the power supply is functioning. In most cases, this level of pass/fail testing is all that is required. In some circumstances where the supply is operational yet erratic behavior exists, it may be desirable to verify correct voltage of the 3.3V, 5V and 12V outputs. The three position rotary switch and DC voltmeter panel allow easy verification of these voltages. Additionally, the supply voltage to external peripherals such as DVD/CD ROM, floppy and hard drives may be tested. This tester will verify these types of outputs on older type power supplies also. Many low cost computer power supplies have one internal circuit for each of 3.3V, 5V and 12V voltages. In this case, all outputs whether on the motherboard, the processor or a peripheral connector, of the same voltage, are internally tied together. In higher quality supplies, these outputs are independent and isolated from each other. The Tenma #72-1084 ATX Power Supply Tester will independently verify each of these outputs, including the both +12V outputs on the P4 processor connector. Directions General Pass/Fail Test Disconnect the computer power supply from the AC power source Disconnect all IDE and other devices that are connected to the computer power supply Disconnect the large 20-pin ATX connector from the motherboard Set the rocker switch on the tester to the OFF position Connect the 20-pin ATX connector, from the power supply, to the tester Connect the computer power supply to an AC power source Set the rocker switch on this tester to the ON position If the LED on the rocker switch lights, the power supply is functioning Testing Output Voltages Caution Simultaneously connecting to CON2, CON3 or CON4 could potentially damage the computer power supply The 20-pin ATX connector must remain inserted in CON1 to allow the tester to keep the computer power supply in the ON mode Ensure that the slide switch, located in the center of the unit, is set to the CON1 (left most) position Use the three position rotary switch to individually test each of the +3V, +5V and +12V outputs on the ATX connector The panel meter should show the same voltage reading on the meter If the meter displays voltage other than that indicated by the switch, the supply is not functioning properly Move the center slide switch to the CON2/3/4 (right most) position Insert the small floppy drive connector (typically used for 3-1/2” drives) into CON2 Toggle the rotary switch between the 5V and 12V position to verify both supply voltages on this connector. This test should be performed independently for all connectors of this type Remove the connector from CON2, and insert the peripheral connector in CON3 Toggle the rotary switch between the 5V and 12V position to verify both supply voltages on this connector. This test should be performed independently for all connectors of this type If the rotary switch is set to the 3.3V position when testing CON2 and CON3, the voltage will still be measured from the ATX connector inserted into CON1 Remove the connector from CON3, and insert the CPU power connector into CON4 This connector provides two separate +12VDC supplies to the P4 processor on appropriate motherboards The slide switch located just beneath the CON4 label allows these supplies to be independently tested The only valid position of the rotary switch in this operation is 12V Toggle the upper right slide switch between both positions to verify proper operation of these two supplies Model #72-1082 Tenma Test Equipment www.tenma.com Test Specifications This tester performs the following tests to the connectors shown below CON1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 8 Pin 10 Pin 14 Pin 15 Pin 17 Pin 20 ATX Style Connector +3.3VDC Common (–) ground Resistive Load to Pin 5 Resistive Load to Pin 4 LED Power Indicator +12VDC Jumper to pin 15 Jumper to pin 14 Led Power Indicator +5VDC CON2 Pin 1 Pin 2 Pin 3 Pin 4 Floppy Drive Connector +5VDC Common (–) ground Common (–) ground +12VDC CON3 Pin 1 Pin 2 Pin 3 Pin 4 Peripheral Connector +12VDC Common (–) ground Common (–) ground +5VDC CON4 Pin 1 Pin 2 Pin 3 Pin 4 P4 Type CPU Power Connector Common (–) ground Common (–) ground +12VDC +12VDC Model #72-1082 Tenma Test Equipment www.tenma.com