221, Pin Signal Name Number | Dell 755 instruction

DC Power Connectors

NOTE: The power supply installed in your computer is one of two options as illustrated below.

DC Power Connector P1

13

14

15

16

17

18

19

20

21

22

23

24

1

2

3

4

5

6

7

8

9

10

11

12

Pin	Signal Name	18-
Number		AWG
		Wire

1	+3.3 VDC	Orange

2	+3.3 VDC	Orange
3	GND	Black
4	VCC (+5 V)	Red
5	GND	Black
6	VCC (+5 V)	Red

Power Supply

221

Image 221

Dell 755 manual 221, Pin Signal Name Number

Contents

W . d e l l . c o m s u p p o r t . d e l l . c o m Dell OptiPlex User’s Guide September JN460 Contents DC Power Connectors P3, P5, P8, and P9 General Drive Installation GuidelinesConnecting and Disconnecting Drive Cables Desktop Computer Connecting and Disconnecting Drive Cables 129 General Drive Installation Guidelines 127DC Power Connector P5 and P6 160 Contents 127 163 Small Form Factor Computer Specifications 175About Your Small Form Factor Computer 165 166 197 Connecting and Disconnecting Drive Cables 196199 202 Connecting and Disconnecting Drive Cables 248 Ultra Small Form Factor Computer Specifications 241About Your Ultra Small Form Factor Computer 227 228 About Smart Cards and Fingerprint Readers 276 Contents Installing a Device When Your Computer Is Turned Off 255255 258 Deleting or Changing an Existing Administrator Password 280 Deleting or Changing an Existing System Password 278277 278 294 Configuring Power Management Settings 295295 296 313 Addressing Memory Configurations 314316 Mini-Tower, Desktop, and Small Form Factor Computers 317 Mail, Modem, and Internet Problems 334 Problems writing to an optical drive 333Troubleshooting Power Problems 339 329 Undoing the Last System Restore 360 Using Microsoft Windows System Restore 359Using Dell PC Restore and Dell Factory Image Restore 361 Windows Vista Dell Factory Image Restore 362 365 Returning Items for Warranty Repair or Credit 367366 367 Finding Information How to set up my computerDesktop System Software DSS Support.dell.com Dell Product Information Guide What Are You Looking For? Find It Here Warranty information Updates Order status, warranty, and repair informationSegment, and enter your Service Tag For your configuration How to use Windows XP System you ordered Not ship with your computer Recommended Tools Before You BeginBefore Working Inside Your Computer Turning Off Your Computer Before You Begin About Your Mini Tower Computer Mini Tower ComputerFront View Mini Tower Computer Power problem may exist see Power Problems on Blinking green The computer is in a power-saving mode21 for more information No light The computer is turned off Back View Green a good connection exists between a 10-Mbps network Back Panel ConnectorsAddress. For more information, see System Setup Options on That came with your computer Removing the Computer CoverCap Security cable slot Cover release latch Padlock ring Inside Your Computer Chassis Intrusion Switch Replacing the Chassis Intrusion Switch Removing the Chassis Intrusion Switch Resetting the Chassis Intrusion Detector System Board Components SATA3 Mini Tower Computer Mini Tower Computer Specifications Connector size ConnectorsConnector data width Maximum PCI Express Connectors Two Sata Serial ATA hard drives DrivesOne3.5-inch floppy drive or media reader Two Sata optical drives Controls and Lights AC power source WattageHeat dissipation Rating Voltage Physical Height WeightWidth Depth Mini Tower Specifications Cards Installing a PCI or PCI Express CardCards Cards Cards Cards Removing a PCI or PCI Express Card Card retention latch Alignment guide Card-edge connector Card connector Card retention latch PS/2 Serial Port Adapter Card fully seated Card not fully seated Bracket within slot Cards Card retention latch Alignment guide Installing eSATA Cards Drives General Drive Installation Guidelines Sata Connector Power Cable Connectors Hard Drive Data cable Hard drive system board Power cable Connector Hard drive Release tabs Snap the bracket onto the new drive Drives Drives Hard drive Hard drive bracket Pins Drives Floppy Drive Floppy drive Drive release latch Floppy drive Shoulder screws Shoulder screw slots Media Card Reader Media card reader Drive release latch Media card Shoulder screws Shoulder screw slots Reader Optical Drive Optical drive Drive release latch Optical drive Shoulder screws Shoulder screw slots Power cable Data cable Sata optical drive connector Processor ProcessorRemoving the Processor Installing the Processor Processor Processor Panel PanelRemoving the I/O Panel Replacing the I/O Panel Power Supply Power SupplyReplacing the Power Supply Release button Power supply Screws AC power connector DC Power Connector P1 DC Power Connectors Pin Number Signal name AWG Wire Pin Number Signal Name DC Power Connector P2DC Power Connectors P3, P5, P8, and P9 DC Power Connector P10 DC Power Connector P7 Speakers Installing a SpeakerSpeakers Removing a Speaker About Your Desktop Computer Desktop ComputerYour Computer on page 21 for more information Desktop Computer Power Management for Windows XP and Windows Vista on Blinking or solid amber See Power Problems on Position Removing the Computer Cover Inside Your Computer Chassis Intrusion Switch Replacing the Chassis Intrusion Switch Removing the Heat Sink Assembly System Board Components Desktop Computer Desktop Computer Specifications Desktop Computer Specifications Maximum PCI Express without riser-card Cage Connectors PCI without riser-card cage ConnectorsBoard Card or a DVI graphics card for dual-monitor support Maximum Expansion Bus Connector sizeMaximum ESATA Desktop Computer Specifications One3.5-inch floppy drive or media card reader 100One Sata optical drive Port adapter 101 Power source Wattage Rating Power Heat dissipation102 Expansion Cards PCI Cards103 Expansion Cards 105 Expansion Cards 107 Expansion Cards 109 Expansion Cards 111 112 113 Press in on the tab to raise the card-retention latch 114 115 PS/2 Serial Port Adapter 117 Expansion Cards 119 Riser-card cage Handle Riser cards 121 Expansion Cards 123 ESATA Expansion Cards 125 Replace the riser 127 128 129 Drive Inserts 130 131 Drive release latch Optical drive 133 134 135 Drive insert Information Guide Drives 137 Drive release latch Media card reader 139 Drive insert 141 Hard Drive 143 Hard drive Release tabs Plastic hard drive bracket 145 Drives 147 Data cable Hard drive system board Connector 149 Installing the Processor 151 Processor 153 Replacing the I/O Panel 155 Release button Power supply Screws AC power connector 157 158 Pin Signal name 18-AWG Number Wire 159 DC Power Connector P4 DC Power Connector P3DC Power Connector P5 and P6 160 161 162 163 164 About Your Small Form Factor Computer Small Form Factor Computer165 Small Form Factor Computer 166 167 Removing the Computer Cover 169 170 171 172 173 174 175 Small Form Factor Computer SpecificationsSmall Form Factor Computer Specifications 176 ConnectorMaximum PCI Express Connector Port adapter Video 177 178 179 180 181 Expansion Cards 183 184 185 PCI Express and DVI Cards 186 187 Expansion Cards 189 Expansion Cards 191 PS2/SERIAL2 193 Expansion Cards 195 General Installation Guidelines Serial ATA Sata Connector 197 Securing tabs Hard drive 199 Release tabs Hard drive Hard drive bracket 201 Replacing a Hard Drive Fan 203 Optical Drive 205 Floppy Drive 207 Installing a Floppy Drive 209 Media card reader data cable 211 Replacing a Media Card Reader Drives 213 Installing the Processor 215 Processor 217 Replacing the I/O Panel 219 Mounting screw 221 Pin Signal Name Number 222 223 DC Power Connectors P3Pin Signal 18-AWG Number Name Wire 224 DC Power Connector P5DC Power Connector P6 225 226 About Your Ultra Small Form Factor Computer Ultra Small Form Factor Computer227 3 4 Side View Blinking or solid yellow See Power Problems on228 Management for Windows XP and Windows Vista on 229 Network controller is turned off in system setup 231 Connecting Two Monitors 232 233 Removing the Chassis Intrusion Switch 235 236 237 Cable Cover Optional Information Guide Connecting the AC Power Adapter 239 Dell Badge 240 241 Ultra Small Form Factor Computer Specifications 242 Ultra Small Form Factor Computer Specifications 243 Physical AC power source244 245 246 247 Your computer supports One Sata serial ATA hard drive 248 249 Drives 251 Drives 253 Drives Module Bay Installing a Device When Your Computer Is Turned Off255 Module Bay Bottom of computer Security screw 257 Latch release 259 Securing a Device in the Module Bay 260 261 Top of heat sink Heat sink Retention base Release tab 263 Processor 265 266 267 Removing a Speaker Advanced Features Advanced FeaturesLegacySelect Technology Control Manageability Active Management Technology Error Message Description270 Advanced Functionality 271 Alert Description Alert Standard FormatDell OpenManage Applications 273 Dell Client Manager DCM Physical Security Option SettingsChassis Intrusion Detection Padlock Ring and Security Cable Slot 275 Enabling the TPM FeatureTrusted Platform Module TPM Computer Tracking Software Security Management SoftwareAbout Smart Cards and Fingerprint Readers 276 277 Password ProtectionSystem Password Type the password and press Enter 279 Administrator Password Disabling a Forgotten Password and Setting a New Password System SetupEntering System Setup Overview 281 System Setup ScreensSystem Setup Options 282 Internal default 283 No Boot setting Performance 284 Computrace server 285 Event Log 286Suspend 287 Boot Sequence Memory Key Booting to a USB Device 289 Jumper SettingsMini Tower and Desktop Small Form Factor Advanced Features Ultra Small Form Factor Computer Jumper Setting Description Clearing Forgotten Passwords 291 Clearing Cmos Settings Options in Windows XP Power Management for Windows XP and Windows VistaHyperthreading and Multi-Core Technology 293 Options in Windows Vista 295 About RAID Configurations Segment Hard drive Verifying That RAID Is WorkingRAID Level 297 RAID Level 1 ConfigurationConfiguring Your Computer for RAID Creating a RAID Level 1 Configuration Creating a RAID Level 0 Configuration 299 Creating a RAID Level 1 Configuration 301 Migrating to a RAID Level 0 ConfigurationMigrating to a RAID Level 1 Configuration Advanced Features Replacing the Battery BatteryBattery 303 Battery 305 306 Replacing the System Board Replacing the System Board307 308 Mini Tower System Board Screws 309 Desktop System Board Screws 310 Small Form Factor System Board Screws 311 Ultra Small Form Factor System Board Screws 312 313 MemoryDDR2 Memory Overview Installing Memory Addressing Memory Configurations 315 Memory connector closest to Securing clips ProcessorCutouts Memory module Crossbar Removing Memory Mini-Tower, Desktop, and Small Form Factor Computers Replacing the Computer CoverUltra Small Form Factor Computers 317 318 319 Installing Your Computer in an EnclosureInstalling Your Computer in an Enclosure 320 321 Installing Your Computer in an Enclosure Cleaning a Non-Optical Mouse Cleaning Your ComputerCleaning an Optical Mouse Computer, Keyboard, and Monitor CDs and DVDs Floppy Drive Microsoft Windows XP Features Microsoft Windows FeaturesTransferring Information to a New Computer Microsoft Windows XP Microsoft Windows XP Features 327 Microsoft Windows VistaClick Finished and restart the new computer Connecting to a Network Adapter Setting Up a Home and Office NetworkNetwork Setup Network device Network adapter connector on computer 329 330 Battery Problems TroubleshootingCard Problems Solving Problems 332 Drive Problems Problems writing to an optical drive Optical drive problemsHard drive problems 333 334 Mail, Modem, and Internet ProblemsClick Properties→ Tools→ Check Now Windows XP Click Start→ All Programs→ Modem Helper 335 Lockups and Software Problems Keyboard Problems Program crashes repeatedly Other software problemsProgram is designed for an earlier Windows operating system Solid blue screen appears 338 Memory ProblemsMouse Problems Power Problems Network ProblemsTroubleshooting Power Problems 339 340 Power Supply Self-Test 341 Printer Problems Sound and Speaker Problems Scanner ProblemsNo sound from speakers 342 No sound from headphones Video and Monitor ProblemsScreen is blank Screen is difficult to read 343 3D image quality is poor Power Lights 345 Power Light Problem Description Suggested ResolutionSystem Lights 346 Power Light Problem Description 347 Diagnostic LightsLight Pattern Problem Description 348 Light Pattern Problem Description Suggested Resolution 349 Code Cause Beep Codes350 Message Possible Cause Corrective Action System Messages351 Message Possible Cause 352 When to Use the Dell Diagnostics Dell Diagnostics353 Product Information Guide Solving Problems Tab Function 355Option Function Identifying Drivers What Is a Driver?Drivers 357 Reinstalling Drivers and Utilities 358 You can restore your operating system in the following ways Using Microsoft Windows System RestoreRestoring Your Operating System To start the Hardware Troubleshooter Starting System Restore 361 Using Dell PC Restore and Dell Factory Image RestoreUsing PC Restore Image Restore Removing PC Restore Click Finish to reboot the computer Using the Operating System MediaClick Exit if the Install Windows message appears 363 Solving Problems Getting Help Online ServicesObtaining Assistance 365 Support Service AutoTech ServiceAutomated Order-Status Service 367 Problems With Your OrderBefore You Call Guide 368 369 Contacting Dell 371 WarrantyWarranty 372 FCC Class B FCC Notices U.S. Only373 FCC Notices US Only 374 375 Glossary 376 377 378 379 380 381 382 383 384 Video resolution See resolution 385 386