Dell OptiPlex Gn+ Service Manual Download Page 27

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System Overview

1-15

Figure 1-15. DC Power Connectors P2 (Low-Profile) and P7

DC Power Distribution

Figures 1-13 through 1-17 provide the following information about DC power
distribution:

•

Power-supply connector identification

•

Power cable connections for diskette, tape, CD-ROM, and hard-disk drives

•

Power distribution to sockets and connectors on the system board

Figure 1-16. DC Power Cables for the Low-Profile Computers

+3.3 VDC (blue/white)

common (black)

P2, P7

+3.3 VDC (blue/white)

common (black)

Summary of Contents for OptiPlex Gn+

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Page 4: ...tium are registered trademarks and MMX is a trademark of Intel Corporation Microsoft MS DOS and Windows are registered trademarks of Microsoft Corporation IBM is a registered trademark of International Business Machines Corporation 3Com is a registered trademark of 3Com Corporation Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and ...

Page 5: ...10 Low Profile Computers 1 11 Midsize Computers 1 11 Mini Tower Computers 1 11 Enhanced Dual Interface EIDE Subsystem 1 11 Built In Video Controller 1 11 Optional NIC 1 12 Floor Stand 1 12 Computer Service 1 13 Computer Power Supply 1 13 Pin Assignments for the DC Power Connectors 1 14 DC Power Distribution 1 15 System Board 1 20 Main Memory 1 21 System Board Jumpers 1 21 Interrupt Assignments 1 2...

Page 6: ...ing and Replacing Parts on the Low Profile Chassis 4 1 Recommended Tools 4 1 Precautionary Measures 4 2 Floor Stand 4 3 Computer Cover 4 4 Eject Power and Reset Buttons 4 5 Front Panel Inserts 4 6 Control Panel 4 8 Drives 4 9 3 5 Inch Diskette Drive Assembly 4 10 5 25 Inch Drive Assembly 4 11 Hard Disk Drive Assembly 4 12 System Power Supply 4 13 System Board Components 4 14 Expansion Cards 4 15 E...

Page 7: ...ard Disk Drive Bracket 5 12 Hard Disk Drive 5 13 System Power Supply 5 14 System Board Components 5 15 Expansion Cards 5 16 Expansion Card Cage 5 16 Expansion Card 5 17 Riser Board 5 18 DIMMs 5 19 Microprocessor Heat Sink Assembly 5 20 System Battery 5 22 System Board 5 23 Chapter 6 Removing and Replacing Parts on the Mini Tower Chassis 6 1 Recommended Tools 6 1 Precautionary Measures 6 2 Computer...

Page 8: ...eatures 1 4 Figure 1 3 Internal View of the Low Profile Computer 1 5 Figure 1 4 Internal View of the Midsize Computer 1 6 Figure 1 5 Internal View of the Mini Tower Computer 1 7 Figure 1 6 Riser Board for the Low Profile Computers 1 8 Figure 1 7 EM Riser Board for the Low Profile Computers 1 8 Figure 1 8 Riser Board for the Midsize Computers 1 9 Figure 1 9 EM Riser Board for the Midsize Computers ...

Page 9: ... Panel Removal 4 8 Figure 4 8 Drive Hardware 4 9 Figure 4 9 3 5 Inch Diskette Drive Removal 4 10 Figure 4 10 5 25 Inch Drive Assembly Removal 4 11 Figure 4 11 Hard Disk Drive Assembly Removal 4 12 Figure 4 12 System Power Supply Removal 4 13 Figure 4 13 System Board Components 4 14 Figure 4 14 Expansion Card Cage Removal 4 15 Figure 4 15 Expansion Card Removal 4 16 Figure 4 16 Riser Board Removal ...

Page 10: ...ver Removal 6 3 Figure 6 2 Padlock 6 3 Figure 6 3 Front Bezel Removal 6 4 Figure 6 4 Eject Power and Reset Button Removal 6 5 Figure 6 5 5 25 Inch Front Panel Insert Removal 6 6 Figure 6 6 3 5 Inch Front Panel Insert Removal 6 7 Figure 6 7 Control Panel Removal 6 8 Figure 6 8 Drive Hardware 6 9 Figure 6 9 3 5 Inch Drive Assembly Removal 6 10 Figure 6 10 3 5 Inch Diskette Drive Removal 6 11 Figure ...

Page 11: ...reens A 2 Figure A 2 Device List Screen A 6 Tables Table 1 1 DC Voltage Ranges 1 13 Table 1 2 System Board Jumper Descriptions 1 22 Table 1 3 Interrupt Assignments 1 23 Table 1 4 DREQ Line Assignments 1 24 Table 1 5 Technical Specifications 1 25 Table 3 1 POST Beep Codes 3 2 Table 3 2 System Error Messages 3 5 Table A 1 System Setup Categories A 3 ...

Page 12: ...nd prior training in IBM compatible PC troubleshooting techniques In addition to information provided in this manual and the Reference and Installation Guide that came with the system Dell provides the Diagnostics and Troubleshooting Guide for troubleshooting procedures and instructions on using the Dell Diagnostics to test the computer system WARNING A WARNING indicates the potential for bodily h...

Page 13: ...as the ISA expansion bus These buses are built into the system board which also integrates the microprocessor mem ory controller hard disk drive controller video controller and other elements of the basic computer The microprocessor for the OptiPlex Gn and Gn computers is installed in a type 7 ZIF socket which allows the computer to be upgraded when faster microprocessors become available The Pent...

Page 14: ...thernet NIC Optional NIC adapter providing Wakeup On LAN capability available only on the EM Integrated Universal Serial Bus USB controller with two USB compliant connectors Self Monitoring Analysis Reporting Technology SMART compliant hard disk drives and SMART support in the system BIOS which provides notification at system start up if a hard disk drive has become unreliable New quick test featu...

Page 15: ...System Overview 1 3 Figure 1 1 Computer Orientation right side left side front back left side front right side low profile computer mini tower computer front back top bottom midsize computer back ...

Page 16: ...ive access indicator power button power indicator diskette drive access indicator reset button hard disk drive access indicator power button power indicator midsize computer low profile computer mini tower computer power indicator hard disk drive access indicator power button reset button diskette drive access indicator cover release button ...

Page 17: ...e reset close any open application programs and files if possible serial port 1 connector power supply voltage selection switch AC power receptacle 3 5 inch diskette drive expansion card cage USB connectors 2 keyboard connector video connector expansion card slots 3 hard disk drive optional system board NIC connector Gn hard disk drive interface cable diskette tape drive interface cable parallel p...

Page 18: ...ptacle serial port 1 connector drive cage diskette tape drive interface cable hard disk drive bracket hard disk drive interface cable 3 5 inch diskette drive expansion card cage expansion card slots 5 video connector padlock ring security cable slot system board optional system board NIC connector Gn USB connectors 2 keyboard connector mouse connector serial port 2 connector ...

Page 19: ...vides instructions on using the Device Manager to manage resources and resolve conflicts After all legacy cards have been configured by the operating system or with the ICU the computer automatically assigns any required memory space IRQ lines and DMA channels to any installed Plug and Play ISA expansion cards and PCI expansion cards the next time the computer is rebooted Chapter 3 Using the ISA C...

Page 20: ...uters If you have the EM version of the low profile computer the riser board for the computer is different see Figure 1 7 P1 is the network card connection on the riser board If the LED is on the riser is receiving power if it is off the riser is not receiving power Figure 1 7 EM Riser Board for the Low Profile Computers Midsize Computer s Expansion Card Slots The midsize computers have five expan...

Page 21: ...r board If the LED is on the riser is receiving power if it is off the riser is not receiving power Figure 1 9 EM Riser Board for the Midsize Computers Mini Tower Computer s Expansion Card Slots The mini tower computers have seven expansion card slots The riser board has four ISA expansion card connectors and five PCI expansion card connectors HDLED connector ISA3 connector ISA2 connector ISA1 con...

Page 22: ...the riser board for the computer is different see Figure 1 11 P1 is the network card connection on the riser board If the LED is on the riser is receiving power if it is off the riser is not receiving power Figure 1 11 EM Riser Board for the Mini Tower Computers Hard Disk Drive Options The following subsections provide service related information about hard disk drive options in the low profile mi...

Page 23: ...evices The EIDE controller attaches to the high speed PCI local bus The primary EIDE interface IDE1 supports up to two high performance EIDE devices The computer s boot drive should be connected to this connection the primary EIDE interface The secondary EIDE interface IDE2 also supports up to two high performance EIDE devices typically EIDE tape drives or CD ROM drives NOTE The externally accessi...

Page 24: ...ndicators A yellow activity indicator flashes when the computer is transmitting or receiving network data A high volume of network traffic may make this indicator appear to be in a steady on state A green link integrity indicator lights up when a good connection exists between the network and the NIC When the green indicator is off the com puter is not detecting a physical connection to the networ...

Page 25: ...nectors on the system board or drives Table 1 1 DC Voltage Ranges Voltage Range Maximum Output Current 3 3 VDC 3 15 to 3 45 VDC 12 0 A1 low profile computers 14 0 A1 midsize and mini tower computers 5 VDC 4 75 to 5 25 VDC 18 0 A1 low profile computers 22 0 A1 midsize and mini tower computers 12 VDC 11 40 to 12 60 VDC 3 0 A2 low profile computers 6 0 A2 midsize and mini tower computers 12 VDC 10 80...

Page 26: ...speed 3 Pin 5 PWRGOOD should measure between 4 and 5 VDC when the power supply is operating to indicate that all power supply output voltages are within the ranges specified in Table 1 1 Figure 1 13 DC Power Connector P1 Figure 1 14 DC Power Connectors P2 Midsize and Mini Tower P3 P4 P5 P6 and P9 11 1 PWRGOOD 3 orange 12 VDC blue 12 VDC yellow 5 VFP purple common black 2 3 4 5 6 7 8 9 10 12 13 14 ...

Page 27: ... distribution Power supply connector identification Power cable connections for diskette tape CD ROM and hard disk drives Power distribution to sockets and connectors on the system board Figure 1 16 DC Power Cables for the Low Profile Computers 1 2 3 4 3 3 VDC blue white common black common black 5 P2 P7 6 3 3 VDC blue white 3 3 VDC blue white common black P5 P4 P3 P2 P1 ...

Page 28: ...P2 3 3 VDC PWRGOOD P1 POWER1 PSON 5 VFP 5 VDC 12 VDC 12 VDC PSON 5 VFP 5 VDC 5 VDC 12 VDC 12 VDC P3 5 VDC 12 VDC 12 VDC 12 VDC 12 VDC 12 VDC 3 5 inch diskette drive computer power supply keyboard controller battery 5 VDC 5 VDC ISA1 ISA2 PCI1 PCI2 MICROPROCESSOR PANEL KYBD MOUSE DIMM_A DIMM_B main memory sockets P4 FAN RISER optional drive P5 riser board system board internal hard disk drive POWER2...

Page 29: ...System Overview 1 17 Figure 1 18 DC Power Cables for the Midsize and Mini Tower Computers P7 P9 P5 P4 P3 P2 P1 P6 Some computers have an additional connector P9 that may be used instead of P5 or P6 ...

Page 30: ...ON 5 VFP 5 VDC 5 VDC 12 VDC 12 VDC 3 VDC keyboard controller P3 5 VDC 12 VDC 12 VDC 12 VDC 3 5 inch diskette drive battery P1 ISA1 through ISA3 PCI1 through PCI3 MICROPROCESSOR PANEL KYBD MOUSE DIMM_A DIMM_B main memory sockets P4 FAN RISER internal hard disk drive P2 optional drive P5 P6 riser board system board optional drive internal hard disk drive processor core regulator POWER2 core VCC 2 1 ...

Page 31: ...C 12 VDC PWRGOOD PSON 5 VFP 5 VDC 5 VDC 12 VDC 12 VDC 3 VDC keyboard controller P3 5 VDC 12 VDC 12 VDC 12 VDC 3 5 inch diskette drive battery P1 ISA1 through ISA4 PCI1 through PCI5 MICROPROCESSOR PANEL KYBD MOUSE DIMM_A DIMM_B main memory sockets P4 FAN RISER internal hard disk drive P2 optional drive P5 P6 riser board system board optional drive internal hard disk drive processor core regulator P...

Page 32: ...ctor MONITOR diskette tape drive interface connector DSKT pin 1 corner riser board connector RISER serial port 2 connector SERIAL2 system board jumpers NIC connector ENET Gn only control panel connector PANEL 3 3 V power input connector POWER2 keyboard mouse connectors stacked KYBD MOUSE main power input connector POWER1 microprocessor socket MICROPROCESSOR pin 1 corner DIMM sockets 2 DIMM_A USB c...

Page 33: ...it nonparity EDO DIMMs The standard main memory is 16 MB of high speed 60 ns non parity memory The use of nonparity EDO DIMMs is recommended For optimum performance install DIMMs in consecutive sockets starting with socket DIMM_A See Chapter 6 Installing System Board Options in the Reference and Installation Guide for additional memory upgrade information System Board Jumpers Figure 1 22 System Bo...

Page 34: ...icroprocessor speed Install jumper if the microprocessor s internal speed is 200 MHz otherwise the jumper should not be installed 233 Microprocessor speed Install jumper if the microprocessor s internal speed is 233 MHz otherwise the jumper should not be installed PSWD Password enable or disable Install to enable the password feature BIOS Reserved Do not install jumper One set of the speed jumper ...

Page 35: ...indicate that device con nected to parallel port requires service IRQ8 Generated by keyboard controller for each tick of RTC IRQ9 Available for use by video controller to indicate that the video cir cuitry or monitor requires service IRQ10 Available for use by an expansion card IRQ11 Available for use by a PCI expansion card IRQ12 Generated by keyboard controller to indicate that mouse s output bu...

Page 36: ...oller to initiate DMA cycle for attached diskette drive DREQ3 Available DREQ4 Generated by bus controller chip to activate second DMA controller DREQ5 Available DREQ6 Available DREQ7 Available NOTES The optional built in NIC and built in video controller are assigned available DMA channels automatically during system start up If the parallel port is in ECP mode it uses one of the available DREQ li...

Page 37: ...tem Information System chip set Intel 430TX PCI chip set Data bus width 64 bits Address bus width 32 bits DMA channels seven Interrupt levels 15 Flash EPROM BIOS 2 Mb 256 KB Expansion Bus Bus types PCI and ISA PCI bus complies with PCI specification 2 1 Bus speeds PCI 33 MHz ISA 8 33 MHz PCI expansion card connectors Low profile computers two one PCI connector and one ISA connector share an expans...

Page 38: ... DIMM capacities 16 32 64 and 128 MB EDO parity or nonparity Standard RAM 16 MB Maximum RAM 256 MB Cache memory 512 MB pipeline burst direct mapped write back SRAM BIOS address F0000h Drives Externally accessible bays Low profile computers one 5 25 inch bay for a diskette drive tape drive CD ROM drive or any other device designed for a 5 25 inch bay one 3 5 inch bay for a diskette drive Midsize co...

Page 39: ... attached to the PCI bus Video memory 2 MB Maximum video resolutions1 1280 x 1024 pixels with 256 colors non interlaced 1024 x 768 pixels with 65 536 colors noninterlaced Ports Externally accessible Serial DTE two 9 pin connectors 16550 compatible Parallel one 25 hole connector bidirectional Video one 15 hole connector PS 2 style keyboard 6 pin mini DIN connector PS 2 compatible mouse 6 pin mini D...

Page 40: ...gles microprocessor speeds on 101 key keyboard in MS DOS real mode only Ctrl Alt toggles microprocessor speeds on 102 key keyboard in MS DOS real mode only Controls and Indicators Reset control push button Power control push button Power indicator green LED Diskette drive access indicator green LED Hard disk drive access indicator green LED Link integrity indicator on NIC connector green LED Activ...

Page 41: ... 10 9 cm 4 3 inches Width 40 89 cm 16 1 inches Depth 43 69 cm 17 2 inches Weight minimum 10 89 kg 24 lb or more depending on options installed Midsize computers Height 16 5 cm 6 5 inches Width 41 9 cm 16 5 inches Depth 44 5 cm 17 5 inches Weight minimum 12 7 kg 28 lb or more depending on options installed Mini tower computers Height 44 4 cm 17 5 inches Width 20 6 cm 8 1 inches Depth 43 7 cm 17 2 i...

Page 42: ...low profile and midsize chassis are vertically oriented for this measurement and bottom half sine pulse with a change in velocity of 20 inches sec 50 8 cm sec Storage 27 G faired square wave with a velocity change of 200 inches sec 508 cm sec Altitude Operating 16 to 3048 m2 50 to 10 000 ft Storage 16 to 10 600 m 50 to 35 000 ft 2 The maximum operating temperature of 35 C 95 F is for altitudes bel...

Page 43: ...ate the appropriate troubleshooting procedure to use After the user describes the problem follow these steps 1 Ask the user to back up any data on the hard disk drive if the com puter s condition permits See Maintaining the System in the online System User s Guide for infor mation about backing up data 2 Ask the user to try to duplicate the problem by repeating the operations he or she was perform...

Page 44: ...ly attached to one of the serial port connectors and its captive screws must be secure enough to ensure a firm connection 4 Verify that any devices attached to the serial ports parallel port and USB connectors are properly attached Each of the serial parallel and USB interface cables must be firmly attached to an appropriate connector on the back of the computer as well as to the interface connect...

Page 45: ...e For instructions see Before You Start Testing in Chapter 4 of the Diagnostics and Troubleshooting Guide Most of the steps in this procedure require observation of computer functions and indications some of which can occur simultaneously It may be necessary to reboot the computer several times in order to complete all of these steps To observe problem indications during the boot routine follow th...

Page 46: ...gnostics diskette into the diskette drive and reboot the computer Does the Diagnostics Menu appear Yes See Running the Dell Diagnostics found later in this chapter No Proceed to the next section Internal Visual Inspection Internal Visual Inspection A simple visual inspection of a computer s interior hardware can often lead to the source of a problem such as a loose expansion card cable connector o...

Page 47: ...n Cards in Chapter 4 5 or 6 as appropriate for your computer 4 Verify that all jumpers are set correctly For information about these jumpers see System Board Jumpers in Chapter 1 5 Check all cable connectors inside the computer to verify that they are firmly attached to their appropriate connectors 6 Reinstall the computer cover 7 Reconnect the computer and any attached peripherals to their power ...

Page 48: ...to appear on the screen followed by a message indicating that the diagnostics is loading Before the diagnostics loads a program tests the portion of random access memory RAM required for loading the diagnostics If a main memory error is detected a message appears on the screen indicating which DIMM has failed If no errors are found in main memory the diagnostics loads and the Diagnos tics Menu app...

Page 49: ...tests to help isolate the source of the problem See Running the Dell Diagnos tics in Chapter 2 POST Beep Codes If the monitor cannot display error messages during the POST the computer may emit a series of beeps that identifies the problem or that can help you iden tify a faulty component or assembly Table 3 1 lists the beep codes that may be generated during the POST Most beep codes indicate a fa...

Page 50: ...ective system board 1 3 2 No memory installed No memory installed or faulty or improperly seated DIMM 1 3 3 1 3 4 1 4 1 1 4 2 2 1 1 through 2 4 4 Chip or data line failure in the first 64 KB of main memory Odd even logic failure in the first 64 KB of main memory Address line failure in the first 64 KB of main memory Parity failure in the first 64 KB of main memory Bit failure in the first 64 KB of...

Page 51: ...ard 4 3 1 Memory failure above address 0FFFFh Faulty or improperly seated DIMM 4 3 3 Timer chip counter 2 failure Defective system board 4 3 4 Time of day clock stopped Bad battery or defective system board 4 4 1 4 4 2 Serial port test failure Parallel port test failure Faulty I O chip defective system board 4 4 3 Math coprocessor failure Faulty microprocessor chip or system board 4 4 4 Cache test...

Page 52: ...uter cannot usually be rebooted until an appropriate hardware change has been made The following messages indicate a fatal error Bad error correction code ECC on disk read Controller has failed Data error Gate A20 failure Hard disk controller failure Hard disk drive read failure Hard disk failure Keyboard clock line failure Keyboard controller failure Keyboard data line failure Keyboard stuck key ...

Page 53: ... associated controller defective Faulty diskette tape drive subsystem or hard disk drive subsystem defec tive system board Data error Computer received un recoverable data read error from diskette or hard disk drive Faulty diskette diskette drive or hard disk drive Decreasing available memory Read write failure during POST prevents computer from using available memory One or more DIMMs faulty or i...

Page 54: ...e Hard disk drive read failure Hard disk failure Hard disk drive failed to initialize Incorrect configuration settings in System Setup program improperly con nected hard disk drive cable faulty hard disk drive controller sub system defective system board or loose power cable Invalid con figuration information please run SETUP program System Setup program contains incorrect system configuration set...

Page 55: ... at address read value expect ing value Memory odd even logic failure at address read value expect ing value Memory write read failure at address read value expecting value During memory test value read at address was incorrect Faulty or improperly seated DIMMs or defec tive system board Memory alloca tion error Software in use con flicts with operating system application pro gram or utility Fault...

Page 56: ...ed on it Faulty diskette diskette tape drive subsystem or hard disk drive sub system Not a boot diskette No operating system on diskette No operating system on diskette Plug and Play Configuration Error Computer encountered problem in trying to configure one or more expansion cards System resource conflict Read fault Requested sec tor not found MS DOS cannot read from diskette or hard disk drive C...

Page 57: ...battery or faulty chip defective sys tem board Time of day not set Time or date setting in System Setup program incorrect or computer battery bad Incorrect Time or Date settings or defective com puter battery Timer chip counter 2 failed Timer circuit on system board malfunctioning Defective system board Unexpected interrupt in protected mode Keyboard mouse con troller malfunctioning or one or more...

Page 58: ...medi ately back up your data and replace your hard disk drive by call ing your support desk or Dell Computer Cor poration POST queried EIDE drive for status Drive detected possible error conditions Unreliable or defective drive Write fault Write fault on selected drive MS DOS cannot write to diskette or hard disk drive Faulty diskette or hard disk drive Table 3 2 System Error Messages continued Me...

Page 59: ... Tower Chassis Unless otherwise noted each procedure assumes the following You have performed the steps in Precautionary Measures found later in this chapter You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided Recommended Tools Most of the procedures in this chapter require the use of...

Page 60: ...following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury Also dis connect any telephone or telecommunication lines from the computer 3 Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the ba...

Page 61: ... the right side of the computer on a flat work surface 2 Unscrew the captive screw Use your fingers or a wide flat blade screwdriver to unscrew the floor stand screw 3 Pull the floor stand away from the computer Disengage the locator pin that positions and helps secure the floor stand to the computer securing button locator hole captive screw locator pin on under side of floor stand ...

Page 62: ...2 Press the two securing buttons until the cover is free to swing up 3 Raise the back of the cover and pivot it toward the front of the computer 4 Lift the cover off the hooks at the front of the chassis Before you reinstall the cover fold all cables out of the way so that they do not interfere with the cover or with the proper airflow inside the computer securing buttons 2 front of computer hooks...

Page 63: ...h the back of the cover facing you 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button or the reset button use a small screw driver and push in the two or three plastic clips that hold the button to the computer cover When these clips are released the button comes free from the front panel of the cover ...

Page 64: ...n a flat work surface with the front of the cover facing you 2 From the front of the cover use your thumbs to push inward on the insert until it slides off the two posts To replace a front panel insert position the front panel insert and then press the ring tabs over the posts If necessary use a 1 4 inch nutdriver to reposition the ring tabs ring tabs 2 posts 2 computer cover upside down 5 25 inch...

Page 65: ...1 Hold the computer cover with the front facing you 2 Inside the cover press the eject button mechanism toward the front panel to snap the plastic insert out of its opening To replace the front panel insert for the 3 5 inch bay work from outside the cover Place the insert in position and press it into the opening front of cover inside of cover eject button mechanism ...

Page 66: ...e from the PANEL connector on the system board see Figure 4 12 2 From the inside of the chassis remove the mounting screw securing the control panel to the chassis 3 Remove the control panel from the chassis When you reinstall the control panel be sure to put the right side of the con trol panel behind the mounting tab control panel cable control panel mounting screw mounting tab ...

Page 67: ...puter Refer to this figure when you perform any of the procedures in the following subsections Figure 4 8 Drive Hardware diskette tape drive interface cable DC power cable hard disk drive 3 5 inch diskette drive EIDE cable 5 25 inch drive bay and bracket DSKT connector system power supply secondary EIDE connector IDE2 primary EIDE connector IDE1 ...

Page 68: ...rd on the two 3 5 inch diskette drive assembly latches to release the assembly Rotate the left side of the assembly up and lift the assembly out of the chassis 3 Remove the two drive mounting screws from the left side of the drive and remove the drive from the bracket When you replace the 3 5 inch diskette drive be sure the mounting holes on the right side of the drive engage the two hooks on the ...

Page 69: ...f the chassis 4 Lay the 5 25 inch drive assembly upside down and then remove the four screws attaching the drive to the bracket When you replace the 5 25 inch drive place the front of the drive toward the front of the bracket then install the four screws but do not tighten them Align the screws with the score marks on the bracket and tighten the screws in the order stamped on the bottom of the bra...

Page 70: ...tive screw that secures the hard disk drive bracket to the chassis 3 Pivot the hard disk drive assembly up and then lift it out of the chassis 4 Remove the four hard disk drive mounting screws that attach the hard disk drive to the hard disk drive bracket When you reinstall the hard disk drive assembly be sure the tabs on the back of the mounting plate fully engage the notches on the chassis befor...

Page 71: ...er cables from the system board and the drives 3 Remove the power supply mounting screw at the back of the chassis 4 Slide the system power supply forward until it stops then lift it from the chassis When you replace the system power supply position it against the interior right side of the chassis Then slide the system power supply toward the back of the chassis and hook the tabs into the right s...

Page 72: ...ce connector DSKT pin 1 corner riser board connector RISER serial port 2 connector SERIAL2 system board jumpers NIC connector ENET Gn only control panel connector PANEL 3 3 V power input connector POWER2 keyboard mouse connectors stacked KYBD MOUSE main power input connector POWER1 microprocessor socket MICROPROCESSOR pin 1 corner DIMM sockets 2 DIMM_A USB connectors USB front of computer parallel...

Page 73: ...e expansion cards leave the external cables attached to the expansion cards Expansion Card Cage Figure 4 14 Expansion Card Cage Removal To remove an expansion card cage follow these steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Lift the expansion card cage up and away from the computer To replace an expansion card cage keep it flush against the c...

Page 74: ... screw from the card mounting bracket 4 Grasp the expansion card by its corners and carefully remove it from the expansion card connector If you install the optional Wakeup On LAN network card EM computers only connect the 5 VFP cable from the card to the P1 connector on the riser board See Low Profile Computer s Expansion Card Slots found in Chapter 1 of this manual expansion card card slot openi...

Page 75: ...cards 2 Lay the expansion card cage on a flat work surface with the riser board facing up 3 Remove the two riser board mounting screws 4 Lift the riser board away from the expansion card cage When you replace the riser board be sure the alignment feature on the expansion card cage engages with the alignment slot riser board riser board mounting screws 2 expansion card cage riser board alignment sl...

Page 76: ...uring clips until the DIMM is released from its socket Lift the DIMM away from the socket Figure 4 18 DIMM Installation To replace a DIMM press the DIMM fully into the socket as shown in step 1 of Figure 4 18 Then close the securing clips to lock the DIMM into the socket as shown in step 2 of Figure 4 18 securing clips securing clips 2 1 ...

Page 77: ...driver to release the clip 2 Push outward and then upward on the microprocessor socket release lever to rotate the lever to its fully vertical position see Figure 4 20 3 Lift the microprocessor heat sink assembly out of its socket WARNING The microprocessor chip can get extremely hot during system operations Be sure the chip has had sufficient time to cool before touching it microprocessor securin...

Page 78: ...hen the microprocessor heat sink assembly is in place rotate the microprocessor socket release lever to its horizontal position Hook the microprocessor securing clip over the socket tab nearest the right side of the system board and then snap it over the tab on the opposite side of the socket NOTE Pin 1 on the microprocessor is located on the corner with the largest bevel The pin 1 hole in the mic...

Page 79: ...t of its socket with your fingers or with a blunt nonconducting object such as a plastic screwdriver When you replace the system battery orient the new battery with the facing up Insert the battery into its socket and snap it into place WARNING There is a danger of the new battery exploding if it is in correctly installed Replace the battery only with the same or equivalent type recommended by the...

Page 80: ...hassis until it stops 6 Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board If you are replacing a system board remove the DIMMs and the microprocessor heat sink assembly from the old system board and install them on the replacement board When you reinstall the system board push down near each slot to engage the grounding clip onto its correspon...

Page 81: ...ower Chassis Unless otherwise noted each procedure assumes the following You have performed the steps in Precautionary Measures found later in this chapter You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided Recommended Tools Most of the procedures in this chapter require the use of o...

Page 82: ...following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury Also dis connect any telephone or telecommunication lines from the computer 3 Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the ba...

Page 83: ... these steps 1 Place the right side of the computer on a flat work surface 2 Unscrew the floor stand screw Use your fingers or a wide flat blade screwdriver to unscrew the floor stand screw 3 Pull the floor stand away from the computer Disengage the three orientation tabs that position and help secure the floor stand to the computer floor stand screw ...

Page 84: ...2 Press the two securing buttons until the cover is free to swing up 3 Raise the back of the cover and pivot it toward the front of the computer 4 Lift the cover off the hooks at the front of the chassis Before you reinstall the cover fold all cables out of the way so that they do not interfere with the cover or with the proper airflow inside the computer front of computer securing buttons 2 hooks...

Page 85: ...the back of the cover facing you 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button or the reset button use a small screw driver and push in the two or three plastic clips that hold the button to the computer cover When these clips are released the button comes free from the front panel of the cover po...

Page 86: ...n a flat work surface with the front of the cover facing you 2 From the front of the cover use your thumbs to push inward on the insert until it slides off the two posts To replace a front panel insert position the front panel insert and then press the ring tabs over the posts If necessary use a 1 4 inch nutdriver to reposition the ring tabs ring tabs 2 posts 2 computer cover upside down 5 25 inch...

Page 87: ...Hold the computer cover with the front facing you 2 Inside the cover press the eject button mechanism toward the front panel to snap the plastic insert out of its opening To replace the front panel insert for the 3 5 inch bay work from outside the cover Place the insert in position and press it into the opening front of cover inside of cover eject button mechanism ...

Page 88: ...acket 2 Disconnect the control panel cable from the PANEL connector on the system board see Figure 5 15 3 Remove the mounting screw securing the control panel to the chassis 4 Slide the control panel out of the hooks securing it to the chassis Note the routing of the control panel cable as you remove it from the chassis control panel control panel cable screw chassis hooks 2 ...

Page 89: ...n the com puter Refer to this figure when you perform any of the procedures in the following subsections Figure 5 8 Drive Hardware diskette tape drive interface cable DC power cable DSKT connector system power supply hard disk drive bracket secondary EIDE connector IDE2 primary EIDE connector IDE1 EIDE cable 3 5 inch diskette drive ...

Page 90: ...e 2 Remove the bracket mounting screw 3 Rotate the left side of the 3 5 inch diskette drive assembly up and lift the assembly out of the chassis 4 Remove the two drive mounting screws from the left side of the drive and remove the drive from the bracket When you replace the 3 5 inch diskette drive be sure the two hooks on the right side of the bracket engage the mounting holes in the side of the 3...

Page 91: ... on each side of the drive and slide the drive assembly forward to remove it 3 Remove the four screws attaching the 5 25 inch drive to the mounting plate and lift the drive out of the mounting plate Figure 5 11 5 25 Inch Drive Removal When you replace the 5 25 inch drive align the front of the drive flush with the tabs at the front of the mounting plate Insert the four screws and tighten them in t...

Page 92: ...e the screw that secures the hard disk drive bracket to the front of the chassis 3 Grasp the handle on the front of the bracket and rotate the front of the bracket up until the hooks are free from the chassis 4 Lift the hard disk drive bracket out of the computer When you reinstall the hard disk drive bracket be sure that the opening in the lower back tab is over the alignment tab on the chassis b...

Page 93: ...attach the hard disk drive to the hard disk drive bracket One hard disk drive attaches to the hard disk drive bracket at the sides of the drive The other hard disk drive attaches to the hard disk drive bracket at the bottom of the drive 3 Slide the drive out of the hard disk drive bracket hard disk drive drive mounting screws 4 for side mounted drive hard disk drive bracket drive mounting screws 4...

Page 94: ...ower supply from the securing tab labeled RELEASE and rotate it to the right until it stops Press the securing tab to the left to release the power supply 3 Disconnect the DC power cables from the system board and the drives 4 Lift the front end of the system power supply and move it to the right to disengage the power supply from the slot in the chassis 5 Lift the system power supply from the com...

Page 95: ...nnector DSKT pin 1 corner riser board connector RISER serial port 2 connector SERIAL2 system board jumpers NIC connector ENET Gn only control panel connector PANEL 3 3 V power input connector POWER2 keyboard mouse connectors stacked KYBD MOUSE main power input connector POWER1 microprocessor socket MICROPROCESSOR pin 1 corner DIMM sockets 2 DIMM_A USB connectors USB front of computer parallel seri...

Page 96: ...pansion cards leave the external cables attached to the expansion cards Expansion Card Cage Figure 5 16 Expansion Card Cage Removal To remove an expansion card cage follow these steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Lift the expansion card cage up and away from the computer To replace an expansion card cage keep it flush against the chass...

Page 97: ... screw from the card mounting bracket 4 Grasp the expansion card by its corners and carefully remove it from the expansion card connector If you install the optional Wakeup On LAN network card EM computers only connect the 5 VFP cable from the card to the P1 connector on the riser board See Midsize Computer s Expansion Card Slots found in Chapter 1 of this manual expansion card card slot opening c...

Page 98: ...cage and all expansion cards 2 Place the expansion card cage on a flat work surface with the riser board facing up 3 Remove the two riser board mounting screws 4 Slide the riser board over as shown by the arrow in Figure 5 18 until it stops then lift the riser board away from the expansion card cage riser board riser board mounting screws 2 expansion card cage slots 2 ...

Page 99: ...ecuring clips until the DIMM is released from its socket Lift the DIMM away from the socket Figure 5 20 DIMM Installation To replace a DIMM press the DIMM fully into the socket as shown in step 1 of Figure 5 20 Then close the securing clips to lock the DIMM into the socket as shown in step 2 of Figure 5 20 securing clips securing clips 2 1 ...

Page 100: ...d part of the clip with a small screwdriver to release the clip 3 Push outward and then upward on the microprocessor socket release lever to rotate the lever to its fully vertical position see Figure 5 22 4 Lift the microprocessor heat sink assembly out of its socket WARNING The microprocessor chip can get extremely hot during system operations Be sure the chip has had sufficient time to cool befo...

Page 101: ... When the microprocessor heat sink assembly is in place rotate the microprocessor socket release lever to its horizontal position Hook the microprocessor securing clip over the socket tab nearest the right side of the system board and then snap it over the tab on the opposite side of the socket NOTE Pin 1 on the microprocessor is located on the corner with the largest bevel The pin 1 hole in the m...

Page 102: ...ttery out of its socket with your fingers or with a blunt nonconducting object such as a plastic screwdriver When you replace the system battery orient the new battery with the facing up Insert the battery into its socket and snap it into place WARNING There is a danger of the new battery exploding if it is in correctly installed Replace the battery only with the same or equivalent type recommende...

Page 103: ...stem board toward the front of the chassis until it stops 7 Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board If you are replacing a system board remove the DIMMs and the microprocessor heat sink assembly from the old system board and install them on the replacement board When you reinstall the system board push down near each slot to engage t...

Page 104: ...5 24 Dell OptiPlex Gn and Gn Systems Service Manual ...

Page 105: ...idsize Chassis Unless otherwise noted each procedure assumes the following You have performed the steps in Precautionary Measures found later in this chapter You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided Recommended Tools Most of the procedures in this chapter require the use of...

Page 106: ...following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury Also dis connect any telephone or telecommunication lines from the computer 3 Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the ba...

Page 107: ...ide of the computer press the release button at the bottom left corner of the front bezel see Figure 6 1 3 Lift the bottom of the cover allowing it to pivot toward you 4 Disengage the tabs that secure the cover to the top of the chassis and lift the cover away Before you reinstall the cover fold all cables out of the way so that they do not interfere with the cover or with the proper airflow insid...

Page 108: ...nt Bezel Removal To remove the front bezel follow these steps 1 Press the tab release marked with the icon 2 Tilt the bezel away from the chassis 3 Disengage the two retaining hooks at the bottom of the bezel and pull the bezel away from the chassis tab release retaining hooks 2 ...

Page 109: ...rk surface with the back of the bezel facing up 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button or the reset button use a small screw driver and push in the two or three plastic clips that hold the button to the bezel When these clips are released the button comes free from the bezel power button re...

Page 110: ...e steps 1 Hold the bezel with the front facing you 2 From the front of the bezel use your thumbs to press inward on the insert until it slides off the two posts To replace a 5 25 inch front panel insert position the two ring tabs over the posts on the inside of the bay opening Then press the ring tabs over the posts posts 2 bezel ring tabs 2 5 25 inch front panel insert ...

Page 111: ...teps 1 Hold the bezel with the front facing you 2 Inside the bezel press the eject button mechanism toward the front panel to snap the plastic insert out of its opening To replace the front panel insert for the 3 5 inch bay work from outside the bezel Place the insert in position and press it into the opening front of bezel back of bezel eject button mechanism ...

Page 112: ...acket 2 Disconnect the control panel cable from the PANEL connector on the system board see Figure 6 16 3 Remove the mounting screw securing the control panel to the chassis 4 Slide the control panel out of the hooks securing it to the chassis Note the routing of the control panel cable as you remove it from the chassis control panel control panel cable screw chassis hooks 2 ...

Page 113: ... installed in the com puter Refer to this figure when you perform any of the procedures in the following subsections Figure 6 8 Drive Hardware diskette tape drive interface cable DC power cable DSKT connector hard disk drive bracket primary EIDE connector IDE1 secondary EIDE connector IDE2 EIDE cable 3 5 inch diskette drive ...

Page 114: ...bly follow these steps 1 Disconnect the DC power cable and the interface cable from the back of the 3 5 inch diskette drive 2 Press the retaining tab release button and pull the drive assembly for ward to remove it 3 Remove the drive mounting screw from the left side of the drive and remove the drive from the bracket see Figure 6 10 retaining tab release button ...

Page 115: ...ve Removal When you replace the 3 5 inch diskette drive be sure the two hooks on the right side of the bracket engage the mounting holes in the side of the 3 5 inch diskette drive 5 25 Inch Drive Assembly Figure 6 11 5 25 Inch Drive Assembly Removal hooks 2 drive mounting screw retaining tabs 2 ...

Page 116: ...the drive assembly forward to remove it 3 Remove the four screws attaching the 5 25 inch drive to the mounting plate and lift the drive out of the mounting plate see Figure 6 12 Figure 6 12 5 25 Inch Drive Removal When you replace the 5 25 inch drive align the front of the drive flush with the tabs at the front of the mounting plate Insert the four screws and tighten them in the order stamped on t...

Page 117: ...e bracket to the drive cage in the chassis 3 Grasp the bracket and rotate it outward from the chassis until the slid ing tab clears the slide rail on the drive cage 4 Lift the hard disk drive bracket slightly to free the hinge tabs and remove it from the computer When you reinstall the hard disk drive bracket insert the bracket s hinge tabs into the chassis slots so that the tabs hook over the slo...

Page 118: ...e hard disk drive to the hard disk drive bracket One hard disk drive attaches to the hard disk drive bracket at the sides of the drive The other hard disk drive attaches to the hard disk drive bracket at the bottom of the drive 3 Slide the drive out of the hard disk drive bracket hard disk drive hard disk drive bracket drive mounting screws 4 for bottom mounted drive sliding tab drive mounting scr...

Page 119: ...curing tab to release the power supply 3 Disconnect the DC power cables from the system board and the drives 4 Facing the left side of the computer move the front end of the system power supply toward you and lift it to disengage the power supply from the slot in the chassis 5 Lift the system power supply from the computer When you reinstall the power supply place the power supply detente link ove...

Page 120: ...ctor DSKT pin 1 corner riser board connector RISER serial port 2 connector SERIAL2 system board jumpers NIC connector ENET Gn only control panel connector PANEL 3 3 V power input connector POWER2 keyboard mouse connectors stacked KYBD MOUSE main power input connector POWER1 microprocessor socket MICROPROCESSOR pin 1 corner DIMM sockets 2 DIMM_A USB connectors USB front of computer parallel serial ...

Page 121: ...ed to the expansion cards Expansion Card Cage Figure 6 17 Expansion Card Cage Removal To remove an expansion card cage follow these steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Slide the expansion card cage out of the computer To replace an expansion card cage align the tabs on the left and right sides of the expansion card cage with the slots o...

Page 122: ...ew from the card mounting bracket 4 Grasp the expansion card by its corners and carefully remove it from the expansion card connector If you install the optional Wakeup On LAN network card EM computers only connect the 5 VFP cable from the card to the P1 connector on the riser board See Mini Tower Computer s Expansion Card Slots found in Chapter 1 of this manual expansion card card slot opening ca...

Page 123: ...pansion card cage and all expansion cards 2 Place the expansion card cage on a flat work surface with the riser board facing up 3 Remove the riser board mounting screws 4 Slide the riser board away from the release handle until it stops then lift the riser board away from the expansion card cage riser board riser board mounting screws 2 expansion card cage slots 2 ...

Page 124: ...uring clips until the DIMM is released from its socket Lift the DIMM away from the socket Figure 6 21 DIMM Installation To replace a DIMM press the DIMM fully into the socket as shown in step 1 of Figure 6 21 Then close the securing clips to lock the DIMM into the socket as shown in step 2 of Figure 6 21 securing clips securing clips 2 1 ...

Page 125: ...folded part of the clip with a small screwdriver to release the clip 3 Push outward and then upward on the microprocessor socket release lever to rotate the lever to its fully vertical position see Figure 6 23 4 Lift the microprocessor heat sink assembly out of its socket WARNING The microprocessor chip can get extremely hot during system operations Be sure the chip has had sufficient time to cool...

Page 126: ...hen the microprocessor heat sink assembly is in place rotate the microprocessor socket release lever to its horizontal position Hook the microprocessor securing clip over the socket tab nearest the right side of the system board and then snap it over the tab on the opposite side of the socket NOTE Pin 1 on the microprocessor is located on the corner with the largest bevel The pin 1 hole in the mic...

Page 127: ...tery out of its socket with your fingers or with a blunt nonconducting object such as a plastic screwdriver When you replace the system battery orient the new battery with the facing up Insert the battery into its socket and snap it into place WARNING There is a danger of the new battery exploding if it is in correctly installed Replace the battery only with the same or equivalent type recommended...

Page 128: ...board to the side of the chassis 7 Slide the system board toward the front of the chassis until it stops 8 Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board If you are replacing a system board remove the DIMMs and the microprocessor heat sink assembly from the old system board and install them on the replacement board When you reinstall the sy...

Page 129: ...he System Setup program follow these steps 1 Turn on or reboot the system 2 Press Ctrl Alt Enter immediately after you see the following message Press Ctrl Alt Enter for Setup If you wait too long and the operating system begins to load into memory let the system complete the load operation then shut down the system and try again You can also enter the System Setup program by responding to certain...

Page 130: ...mat hours minutes seconds for the internal clock calendar To change the value in a field enter a number or use the left or right arrow key Changes take effect immediately BIOS Version XXX This category sets whether keyboard related error messages are reported at system startup Alt P next Tab Shift Tab change fields Time 13 17 02 Alt P next Alt B reboot Reserved Memory CPU Speed Num Lock None 233 M...

Page 131: ... ters directly To do so highlight the appropriate Drive category Drive 0 or Drive 1 and type u to display User1 Press Tab to highlight each of the parameter fields in succession and enter the appropriate number for each field NOTE For all devices from Dell that use the built in EIDE controller set the appropriate Drive category to Auto Reserved Memory Designates a region of system board memory tha...

Page 132: ...ake sure the system has a DPMS compliant monitor Otherwise there is a risk of dam aging the monitor NOTE Not all EIDE hard disk drives support this feature Enabling this feature for drives that do not support it may cause the EIDE drive to become inoperable until the system is restarted and the Power Management category is disabled Wakeup On LAN Determines whether the Wakeup On LAN fea ture is set...

Page 133: ...lt in EIDE hard disk drive interface Diskette Enables system s built in diskette drive controller Speaker Enables built in speaker Microprocessor Displays type of microprocessor installed Level 2 Cache Displays size of the integrated cache Video Memory Displays amount of video memory on the sys tem board System Memory Displays entire amount of installed memory detected in system except for memory ...

Page 134: ...original list Exclude from Boot Device Priority Ctrl Ins move to other list The DEVICE LIST contains devices that may be bootable The system attempts to boot from the devices in the list as ordered If you ESC or ALT B from this menu the displayed order becomes the boot selection Ctrl Ins moves items between Boot Device Priority and Exclude from Boot Device Priority only BIOS Version XXX 512 KB 2 M...

Page 135: ... computer 1 6 on back of mini tower computer 1 7 control panel removal 4 8 5 8 6 8 controllers NIC 1 12 video 1 11 cover removal 4 4 6 3 D DC power connector pin assignments 1 14 distribution low profile computer 1 16 distribution midsize computer 1 18 distribution mini tower computer 1 19 power supply connectors low profile computer 1 15 power supply connectors midsize and mini tower computers 1 ...

Page 136: ...rives bracket removal 5 12 6 13 options 1 10 removal 4 12 5 13 6 14 help getting 2 6 I interrupt assignments list of 1 23 ISA expansion card connectors low profile computer 1 8 midsize computer 1 8 mini tower computer 1 9 J jumpers list of 1 22 location 1 21 K key combination to enter System Setup program A 1 M memory subsystem 1 21 messages error 3 4 microprocessor removal 4 19 5 20 6 21 securing...

Page 137: ...ser board removal 4 17 5 18 6 19 S specifications technical 1 25 subsystems EIDE 1 11 expansion 1 7 memory 1 21 system battery removal 4 21 5 22 6 23 system board component locations 1 20 jumpers 1 21 removal 4 22 5 23 6 24 system error messages list of 3 4 system features 1 2 system memory See memory subsystem System Setup program A 1 T tape drive removal 4 11 5 11 6 11 technical specifications 1...

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Page 139: ... www dell com Printed in the U S A P N 56023 Rev A01 ...

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