java barcode reader sdk Lab Exercise 801: Electricity 131 in Software

Painting UPCA in Software Lab Exercise 801: Electricity 131

Lab Exercise 801: Electricity 131
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Figure 8-4 Multimeter probe locations when testing an AC outlet s hot-to-ground circuit
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Step 5 The last measurement you need to take is the voltage in the neutral-to-ground safety circuit When the neutral wire is broken or missing, the ground wire is the only way for wayward electrons to depart safely Any electricity on both the neutral and ground wires should have a direct path back to earth, so there should be no voltage between these wires Place the black probe into the ground opening of the outlet Make sure you have good contact Place the red probe into the neutral opening (refer to Figure 8-5) Move the probes around until you get a good reading for the AC voltage You should get a reading of 0 V What is your reading ____________________ Step 6 Measure another outlet in the same building, and repeat the previous steps Are the readings similar If the readings from your electrical outlets are outside of the ranges described, it s time to call an electrician Assuming your reading is showing good power, go to the next exercise
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132 8: Power Supplies
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Figure 8-5 Multimeter probe locations when testing an AC outlet s neutral-to-ground circuit
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Lab Exercise 802: Power Supply Output
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Once you ve determined that the AC power going to your client s PC is good, the next troubleshooting step is to test whether the DC power traveling from the power supply to the rest of her system is good
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Since this lab exercise takes you through the steps you would perform on an actual trouble ticket, the scenario has you working on a machine that is completely assembled If, however, you are working on the disassembled, non-production machine, you should proceed to Lab Exercise 803 ( Replacing a Power Supply ) and reinstall the power supply in the tear-down machine You may then return here and perform the power supply output exercises
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Lab Exercise 802: Power Supply Output 133
Learning Objectives
At the end of this lab, you ll be able to
Identify the connectors of a PC power supply Measure the output of a PC power supply
Lab Materials and Setup
The materials you need for this lab are
The disassembled, non-production PC computer system used in the lab exercises in 2 (with the power supply reinstalled) Optionally, a working PC with an ATX power supply A multimeter A PC power supply tester
Getting Down to Business
There are two ways to determine whether a power supply is providing the proper voltages to the components of the computer One is the traditional method, using a multimeter to measure the actual voltages Another method growing in popularity is the use of a PC power supply tester
Cross-Reference
For details on DC power from the power supply, refer to the Supplying DC section in 8 of Mike Meyers A+ Guide to Managing and Troubleshooting PCs
In the following steps, you ll measure DC voltage coming from the PC power supply The two places to measure power supply output are at the Molex power connectors and at the motherboard power connector Molex power connectors plug into devices that need 5 or 12 volts of power These include hard drives and CD- or DVD-media drives Mini connectors also carry 5 or 12 volts, but on modern systems these are used only for floppy drives On most recent systems, the power supply will provide two motherboard power connectors: the 20- or 24-pin P1 and the smaller P4 (see Figure 8-6) Both of these power connectors are used on motherboards requiring an additional 12 V power supply You ll then plug the P1 power connector into a PC power supply tester and verify that the readings you measured with the multimeter are within tolerance The power supply tester has LEDs that will glow green for each of the voltages that it passes
134 8: Power Supplies
Figure 8-6 Motherboard power connectors: P1 (left) and P4 (right)
Warning
Although the power coming out of the PC power supply is considerably less lethal than that coming directly out of the electrical outlet, you should still take all appropriate safety precautions before taking measurements
Step 1 Set the multimeter to read DC voltage Find a Molex connector that s not being used for a device If no Molex connectors are unused, turn the system off and disconnect the one from the CD- or DVDmedia drive, and then turn the PC back on Step 2 Referring to Figure 8-7, place the black probe into either one of the holes on the Molex connector that is aligned with a black wire Now place the red probe into each of the other three holes of the Molex connector in turn, rst the other black wire, then the red, then yellow, and record your ndings Black wire to black wire Black wire to red wire Black wire to yellow wire _____________ V _____________ V _____________ V
Step 3 Measuring the voltage from the motherboard connector is a little trickier Leave the power connector plugged into the motherboard and push the probes into the end of the connector that the wires run into You must push the probe deep enough to touch the metal contact pins, but be careful not to push too deeply or you might push the pin out of the connector Push the black probe into the motherboard connector alongside any black wire, and leave it there Insert the red probe into each of the other wires, and record your ndings Depending on your motherboard connector, you may not have all of these wires
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