Pin Number Signal name AWG Wire | Dell 755 specification

Pin Number	Signal name	18-AWG Wire

4	+5 VDC	Red
5	GND	Black
6	+5 VDC	Red
7	GND	Black
8	PS_PWRGOOD	Gray
9	P5AUX	Purple
10	V_12P0_DIG	White
11	V_12P0_DIG	White
12	+3.3 VDC	Orange
13	+3.3VDC/SE*	Orange
14	-12 VDC	Blue
15	GND	Black
16	PWR_PS_ON	Green
17	GND	Black
18	GND	Black
19	GND	Black
20	NC	NC
21	+5 VDC	Red
22	+5 VDC	Red

82

Power Supply

Image 82

Dell 755 manual Pin Number Signal name AWG Wire

Contents

Dell OptiPlex User’s Guide W . d e l l . c o m s u p p o r t . d e l l . c o m September JN460 Contents Connecting and Disconnecting Drive Cables General Drive Installation GuidelinesDC Power Connectors P3, P5, P8, and P9 Desktop Computer DC Power Connector P5 and P6 160 Contents General Drive Installation Guidelines 127Connecting and Disconnecting Drive Cables 129 127 About Your Small Form Factor Computer 165 Small Form Factor Computer Specifications 175163 166 199 Connecting and Disconnecting Drive Cables 196197 202 About Your Ultra Small Form Factor Computer 227 Ultra Small Form Factor Computer Specifications 241Connecting and Disconnecting Drive Cables 248 228 255 Installing a Device When Your Computer Is Turned Off 255About Smart Cards and Fingerprint Readers 276 Contents 258 277 Deleting or Changing an Existing System Password 278Deleting or Changing an Existing Administrator Password 280 278 295 Configuring Power Management Settings 295294 296 316 Addressing Memory Configurations 314313 Mini-Tower, Desktop, and Small Form Factor Computers 317 Troubleshooting Power Problems 339 Problems writing to an optical drive 333Mail, Modem, and Internet Problems 334 329 Using Dell PC Restore and Dell Factory Image Restore 361 Using Microsoft Windows System Restore 359Undoing the Last System Restore 360 Windows Vista Dell Factory Image Restore 362 366 Returning Items for Warranty Repair or Credit 367365 367 Desktop System Software DSS How to set up my computerFinding Information Support.dell.com What Are You Looking For? Find It Here Warranty information Dell Product Information Guide Segment, and enter your Service Tag Order status, warranty, and repair informationUpdates For your configuration How to use Windows XP Not ship with your computer System you ordered Before Working Inside Your Computer Before You BeginRecommended Tools Turning Off Your Computer Before You Begin Front View Mini Tower ComputerAbout Your Mini Tower Computer Mini Tower Computer 21 for more information Blinking green The computer is in a power-saving modePower problem may exist see Power Problems on No light The computer is turned off Back View Address. For more information, see System Setup Options on Back Panel ConnectorsGreen a good connection exists between a 10-Mbps network Cap Removing the Computer CoverThat came with your computer Security cable slot Cover release latch Padlock ring Chassis Intrusion Switch Inside Your Computer Removing the Chassis Intrusion Switch Replacing the Chassis Intrusion Switch Resetting the Chassis Intrusion Detector System Board Components SATA3 Mini Tower Computer Mini Tower Computer Specifications Connector data width ConnectorsConnector size Maximum PCI Express Connectors One3.5-inch floppy drive or media reader DrivesTwo Sata Serial ATA hard drives Two Sata optical drives Heat dissipation AC power source WattageControls and Lights Rating Voltage Width WeightPhysical Height Depth Mini Tower Specifications Cards Installing a PCI or PCI Express CardCards Cards Cards Cards Removing a PCI or PCI Express Card Card-edge connector Card connector Card retention latch Alignment guide PS/2 Serial Port Adapter Card retention latch Card fully seated Card not fully seated Bracket within slot Cards Card retention latch Alignment guide Installing eSATA Cards General Drive Installation Guidelines Drives Power Cable Connectors Sata Connector 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 Removing the Processor ProcessorProcessor Installing the Processor Processor Processor Removing the I/O Panel PanelPanel Replacing the I/O Panel Replacing the Power Supply Power SupplyPower Supply Release button Power supply Screws AC power connector DC Power Connectors DC Power Connector P1 Pin Number Signal name AWG Wire DC Power Connectors P3, P5, P8, and P9 DC Power Connector P2Pin Number Signal Name DC Power Connector P7 DC Power Connector P10 Speakers Installing a SpeakerSpeakers Removing a Speaker Your Computer on page 21 for more information Desktop ComputerAbout Your Desktop Computer Desktop Computer Blinking or solid amber See Power Problems on Power Management for Windows XP and Windows Vista 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 Board PCI without riser-card cage ConnectorsMaximum PCI Express without riser-card Cage Connectors Card or a DVI graphics card for dual-monitor support Maximum ESATA Desktop Computer Specifications Expansion Bus Connector sizeMaximum One Sata optical drive 100One3.5-inch floppy drive or media card reader Port adapter Power source Wattage 101 102 Power Heat dissipationRating 103 PCI CardsExpansion Cards 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 ESATA 123 Expansion Cards 125 Replace the riser 127 128 Drive Inserts 129 130 131 Drive release latch Optical drive 133 134 135 Drive insert 137 Information Guide Drives 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 Pin Signal name 18-AWG Number Wire 158 159 DC Power Connector P5 and P6 DC Power Connector P3DC Power Connector P4 160 161 162 163 164 165 Small Form Factor ComputerAbout Your Small Form Factor Computer Small Form Factor Computer 166 167 Removing the Computer Cover 169 170 171 172 173 174 Small Form Factor Computer Specifications Small Form Factor Computer Specifications175 Maximum PCI Express Connector Connector176 177 Port adapter Video 178 179 180 181 Expansion Cards 183 184 PCI Express and DVI Cards 185 186 187 Expansion Cards 189 Expansion Cards 191 PS2/SERIAL2 193 Expansion Cards General Installation Guidelines 195 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 Replacing a Media Card Reader 211 Drives 213 Installing the Processor 215 Processor 217 Replacing the I/O Panel 219 Mounting screw Pin Signal Name Number 221 222 Pin Signal 18-AWG Number Name Wire DC Power Connectors P3223 DC Power Connector P6 DC Power Connector P5224 225 226 227 Ultra Small Form Factor ComputerAbout Your Ultra Small Form Factor Computer 3 4 228 Blinking or solid yellow See Power Problems onSide View Management for Windows XP and Windows Vista on 229 Network controller is turned off in system setup Connecting Two Monitors 231 232 233 Removing the Chassis Intrusion Switch 235 236 Cable Cover Optional 237 Connecting the AC Power Adapter Information Guide Dell Badge 239 240 Ultra Small Form Factor Computer Specifications 241 Ultra Small Form Factor Computer Specifications 242 243 244 AC power sourcePhysical 245 246 Your computer supports One Sata serial ATA hard drive 247 248 249 Drives 251 Drives 253 Drives 255 Installing a Device When Your Computer Is Turned OffModule Bay Module Bay Bottom of computer Security screw 257 Latch release Securing a Device in the Module Bay 259 260 261 Top of heat sink Heat sink Retention base Release tab 263 Processor 265 266 267 Removing a Speaker LegacySelect Technology Control Advanced FeaturesAdvanced Features Manageability 270 Error Message DescriptionActive Management Technology Advanced Functionality 271 Dell OpenManage Applications Alert Standard FormatAlert Description Dell Client Manager DCM 273 Chassis Intrusion Detection Option SettingsPhysical Security Padlock Ring and Security Cable Slot Trusted Platform Module TPM Enabling the TPM Feature275 About Smart Cards and Fingerprint Readers Security Management SoftwareComputer Tracking Software 276 System Password Password Protection277 Type the password and press Enter Administrator Password 279 Entering System Setup System SetupDisabling a Forgotten Password and Setting a New Password Overview System Setup Options System Setup Screens281 Internal default 282 No Boot setting 283 284 Performance 285 Computrace server Suspend 286Event Log Boot Sequence 287 Booting to a USB Device Memory Key Mini Tower and Desktop Small Form Factor Advanced Features Jumper Settings289 Clearing Forgotten Passwords Ultra Small Form Factor Computer Jumper Setting Description Clearing Cmos Settings 291 Hyperthreading and Multi-Core Technology Power Management for Windows XP and Windows VistaOptions in Windows XP 293 Options in Windows Vista About RAID Configurations 295 RAID Level Verifying That RAID Is WorkingSegment Hard drive Configuring Your Computer for RAID RAID Level 1 Configuration297 Creating a RAID Level 0 Configuration Creating a RAID Level 1 Configuration 299 Creating a RAID Level 1 Configuration Migrating to a RAID Level 1 Configuration Migrating to a RAID Level 0 Configuration301 Advanced Features Battery BatteryReplacing the Battery 303 Battery 305 306 307 Replacing the System BoardReplacing the System Board Mini Tower System Board Screws 308 Desktop System Board Screws 309 Small Form Factor System Board Screws 310 Ultra Small Form Factor System Board Screws 311 312 DDR2 Memory Overview Memory313 Addressing Memory Configurations Installing Memory Cutouts Memory module Memory connector closest to Securing clips Processor315 Crossbar Removing Memory Ultra Small Form Factor Computers Replacing the Computer CoverMini-Tower, Desktop, and Small Form Factor Computers 317 318 Installing Your Computer in an Enclosure Installing Your Computer in an Enclosure319 320 321 Installing Your Computer in an Enclosure Cleaning an Optical Mouse Cleaning Your ComputerCleaning a Non-Optical Mouse Computer, Keyboard, and Monitor Floppy Drive CDs and DVDs Transferring Information to a New Computer Microsoft Windows FeaturesMicrosoft Windows XP Features Microsoft Windows XP Microsoft Windows XP Features Click Finished and restart the new computer Microsoft Windows Vista327 Network Setup Setting Up a Home and Office NetworkConnecting to a Network Adapter Network device Network adapter connector on computer 329 330 Card Problems TroubleshootingBattery Problems Solving Problems Drive Problems 332 Hard drive problems Optical drive problemsProblems writing to an optical drive 333 Click Properties→ Tools→ Check Now Mail, Modem, and Internet Problems334 Windows XP Click Start→ All Programs→ Modem Helper 335 Keyboard Problems Lockups and Software Problems Program is designed for an earlier Windows operating system Other software problemsProgram crashes repeatedly Solid blue screen appears Mouse Problems Memory Problems338 Troubleshooting Power Problems Network ProblemsPower Problems 339 Power Supply Self-Test 340 Printer Problems 341 No sound from speakers Scanner ProblemsSound and Speaker Problems 342 Screen is blank Screen is difficult to read Video and Monitor ProblemsNo sound from headphones 343 Power Lights 3D image quality is poor System Lights Power Light Problem Description Suggested Resolution345 Power Light Problem Description 346 Light Pattern Problem Description Diagnostic Lights347 Light Pattern Problem Description Suggested Resolution 348 349 350 Beep CodesCode Cause 351 System MessagesMessage Possible Cause Corrective Action 352 Message Possible Cause 353 Dell DiagnosticsWhen to Use the Dell Diagnostics Product Information Guide Solving Problems Option Function 355Tab Function Drivers What Is a Driver?Identifying Drivers Reinstalling Drivers and Utilities 357 358 Restoring Your Operating System Using Microsoft Windows System RestoreYou can restore your operating system in the following ways To start the Hardware Troubleshooter Starting System Restore Using PC Restore Using Dell PC Restore and Dell Factory Image Restore361 Removing PC Restore Image Restore Click Exit if the Install Windows message appears Using the Operating System MediaClick Finish to reboot the computer 363 Solving Problems Obtaining Assistance Online ServicesGetting Help 365 Automated Order-Status Service AutoTech ServiceSupport Service Before You Call Problems With Your Order367 368 Guide 369 Contacting Dell Warranty Warranty371 372 373 FCC Notices U.S. OnlyFCC Class B FCC Notices US Only 374 Glossary 375 376 377 378 379 380 381 382 383 Video resolution See resolution 384 385 386