UPGRADING REPAIRING PCs
UPGRADING REPAIRING PCs UPGRADING REPAIRING PCs
34 Chapter 2—System Components and Configuration Table 2.9 PC99 Color-Coding Standards for Ports Continued Port Type Color IEEE-1394 (i.Link, FireWire) Grey Microphone Pink MIDI/Gameport Gold Parallel port Burgundy Serial port Teal or turquoise Speaker out (subwoofer) Orange Right-to-left speaker Brown USB Black Video out Yellow SCSI, network, telephone, modem, and so on None Power Supplies Power supplies actually convert high-voltage AC (alternating current) into low-voltage DC (direct current) for use by PCs. Power supplies come in several form factors, and they also feature various motherboard connectors to correspond with the newer motherboard designs on the market. Table 2.10 illustrates which power supplies are most likely to be used with various motherboards. Table 2.10 Matching Power Supplies and Motherboards Motherboard Most Common PS Other PS Form Form Factor Form Factor Used Factors Used Baby-AT LPX style Baby-AT, AT/Tower, or AT/Desk LPX LPX style None ATX ATX style None MicroATX ATX style SFX style NLX ATX style None LPX Versus ATX Power Supplies Some motherboards are designed to handle either LPX or ATX power supplies. The ATX is the preferred design because it provides the lower voltage needed by today’s CPUs, offers foolproof installation, and also provides better cooling than older designs. Table 2.11 compares two of the more common power supply form factors used in computers today, and Figure 2.5 shows an LPX power supply.
Table 2.11 Comparing ATX and LPX Power Supplies Power Supplies 35 Power Motherboard Supply Voltage Power Other Type Output Connectors Features Notes LPX 5v, 12v 2–6 pins Easy to reverse the each (P8/P9) plug due to poor keying ATX 3.3v, 5v, 12v 1–20 pins Keyed to go in only one way; allows hibernation via operating system or keyboard command 86mm 6mm 64mm 86mm 16mm 5 138mm 7 + + 5 115mm 150mm Figure 2.5 LPX form factor power supply. 140mm + + 30mm +5V G G +12V +5V G G +12V +5V G G +12V Table 2.12 breaks down the typical LPX power supply connector. 6 +5V G G +12V P.G. +5V +12V -12V G G G G -5V +5V +5V +5V
- Page 1 and 2: UPGRADING AND REPAIRING PCs TECHNIC
- Page 3 and 4: Associate Publisher Greg Wiegand Se
- Page 5 and 6: Contents 1 General Technical Refere
- Page 7 and 8: Contents vii IDE Hard Drive Identif
- Page 9 and 10: Serial Port Configuration 172 Avoid
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- Page 13 and 14: About the Authors Scott Mueller is
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- Page 19 and 20: Chapter 1 General Technical Referen
- Page 21 and 22: Understanding Bits, Nibbles, and By
- Page 23 and 24: Note Glossary of Essential Terms 5
- Page 25 and 26: Glossary of Essential Terms 7 Table
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- Page 89 and 90: Where BIOS Updates Come From 71 Tab
- Page 91 and 92: How to Recover from a Failed BIOS U
- Page 93 and 94: Note A complete list of PnP device
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Table 2.11 Comparing ATX and LPX Power Supplies<br />
Power Supplies 35<br />
Power Motherboard<br />
Supply Voltage Power Other<br />
Type Output Connectors Features Notes<br />
LPX 5v, 12v 2–6 pins Easy to reverse the<br />
each (P8/P9) plug due to poor keying<br />
ATX 3.3v, 5v, 12v 1–20 pins Keyed to go in only one<br />
way; allows hibernation via<br />
operating system or keyboard<br />
command<br />
86mm<br />
6mm<br />
64mm<br />
86mm<br />
16mm<br />
5 138mm<br />
7<br />
+<br />
+<br />
5 115mm<br />
150mm<br />
Figure 2.5 LPX form factor power supply.<br />
140mm<br />
+<br />
+<br />
30mm<br />
+5V<br />
G<br />
G<br />
+12V<br />
+5V<br />
G<br />
G<br />
+12V<br />
+5V<br />
G<br />
G<br />
+12V<br />
Table 2.12 breaks down the typical LPX power supply connector.<br />
6<br />
+5V<br />
G<br />
G<br />
+12V<br />
P.G.<br />
+5V<br />
+12V<br />
-12V<br />
G<br />
G<br />
G<br />
G<br />
-5V<br />
+5V<br />
+5V<br />
+5V
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