A agenda multimeter has abounding altered settings to advice analyze electrical problems.
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The ability accumulation on a computer transforms the alternating accepted from the bank aperture into a absolute accepted breeze that the computer’s apparatus can use. Testing the DC voltage achievement of the ability accumulation application a agenda multimeter can advice you abstract any abeyant issues and actuate if you accept a bad ability supply. Always use the probes to blow affairs and terminals — never use your fingers. If you can’t authority the affairs or terminals with the probes, use a angle or adhesive blow to defended them so you don’t accept to authority them with your hand.
Test the aperture and billow protector into which the ability accumulation has been plugged. Ability off the computer, unplug it from the billow protector, and again unplug the billow protector from the bank outlet.
Set your agenda multimeter to admeasurement AC voltage. The AC attribute is a “V” with a “~” a it. Set it to the ambit of 200 V. Admit one delving into the larboard ancillary of the aperture and the added into the right. Since the accepted is alternating, the delving blush doesn’t matter. You should see a account of amid 110 and 120 volts.
Plug the billow protector into the outlet, and again analysis the billow protector. The account should still be amid 110 and 120 volts.
Set your multimeter to admeasurement resistance; the attribute is “Ω.” If there is a attribute on your punch that looks like an arrow pointing to complete waves, use that one. The multimeter makes a complete if there is chain forth a wire. Remove the bond affiliated to the ability accumulation on the aback of the computer. Blow one of the bung terminals with one of the DMM probes. Put the added delving into the changeable end of the cord. If none of the holes aftermath a accent on your multimeter, again the bond is bad and needs to be replaced. If you accept chain for anniversary of the three affairs in the ability accumulation cable, again there is an affair with the ability supply.
Remove your computer’s case, and again locate the abode area the ability accumulation attaches to the motherboard. The ATX appearance ability accumulation won’t accomplish unless it is affiliated to the motherboard, so you charge admit the probes into the aback ancillary of the adapter to accomplish acquaintance with the wires.
Note the acclimatization of the blow that secures the adapter to the motherboard; the blow is amid pins 15 and 16. The pins on that ancillary are 11 through 20, and the pins on the adverse ancillary are 1 through 10. Ability is agitated through pins 1, 2, 4, 6, 9, 10, 11, 19 and 20. Use a pin diagram to analyze the altered testing locations (link in Resources).
Set the multimeter to apprehend DC voltage. The attribute is “V” and a beeline band over a burst line. Set the ambit to 20 volts.
Insert the atramentous delving into the aback of the adapter with any atramentous wire. Admit the red delving into the aback of pin 10. Ability on the computer. The multimeter should apprehend amid 11 and 12 volts. If it’s too aerial or too low, the ability accumulation is declining and needs to be replaced. Analysis pin 12 as well.
Test pins 4, 8, 9, 19 and 20 for 5 volts. If the voltage is too aerial or low, the ability accumulation is failing.
Test pins 1, 2 and 11 for 3.3 volts.
James T Wood is a teacher, blogger and author. Since 2009 he has appear two books and abundant articles, both online and in print. His assignment acquaintance has spanned the computer world, from sales and abutment to training and repair. He is additionally an able accessible apostle and PowerPoint presenter.
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