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Dell OptiPlex Gn Service Manual

Dell OptiPlex Gn Service Manual

Mini tower computer
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  • Page 4 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 names or their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.

  • Page 5: Table Of Contents

    Contents Chapter 1 System Overview....... 1-1 System Features ..........1-2 Advanced Expansion Subsystem .
  • Page 6 Running the Dell Diagnostics........
  • Page 7 Chapter 5 Removing and Replacing Parts on the Midsize Chassis ......5-1 Recommended Tools ......... . . 5-1 Precautionary Measures .
  • Page 8 Drives ............6-9 3.5-Inch Drive Assembly .
  • Page 9 Figure 1-15. DC Power Connectors P2 (Low-Profile) and P7 ..1-15 Figure 1-16. DC Power Cables for the Low-Profile Computers ..1-15 Figure 1-17. DC Power Distribution for the Low-Profile Computers . . . 1-16 Figure 1-18.
  • Page 10 Figure 5-9. 3.5-Inch Diskette Drive Removal ....5-10 Figure 5-10. 5.25-Inch Drive Assembly Removal ....5-11 Figure 5-11.
  • Page 11 Figure 6-23. Microprocessor Removal ......6-22 Figure 6-24. System Battery Removal ......6-23 Figure 6-25.
  • Page 12 This First A prerequisite for using this manual to service Dell computer systems is a ® basic knowledge of IBM -compatible PCs and prior training in IBM-compatible PC troubleshooting techniques. In addition to information provided in this manual and the Reference and Installation Guide that came...

  • Page 13: Chapter 1 System Overview

    Gn and Gn+, and the Dell OptiPlex Gn and Gn+ with Enhanced Manageability (EM), are high-speed, upgradable, expandable com- puters. (The name Dell OptiPlex Gn and Gn+ will be used to refer to both versions, unless otherwise indicated.) They are available in three sizes: a low- profile desktop computer, a midsize desktop computer, and a mini tower computer.

  • Page 14: System Features

    Features In addition to the standard features found in a traditional personal computer, the Dell OptiPlex Gn and Gn+ computers include the following new and/or advanced features: • Advanced combination ISA and PCI expansion subsystem • Plug and Play ISA expansion-card capability •...

  • Page 15: Figure 1-1. Computer Orientation

    back back left right left right side side side side front front low-profile computer midsize computer back front bottom mini tower computer Figure 1-1. Computer Orientation System Overview...

  • Page 16: Figure 1-2. Front-Panel Features

    Figure 1-2. Front-Panel Features Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 17: Figure 1-3. Internal View Of The Low-Profile Computer

    CAUTION: To avoid possible data or file structure corruptions, the front-panel reset button should be used only when the computer cannot be rebooted by pressing Ctrl . Before you use the reset < >< >< > button to initiate a hardware reset, close any open application programs and files if possible.

  • Page 18: Figure 1-4. Internal View Of The Midsize Computer

    (5) USB connectors (2) security cable slot serial port 2 connector optional system board NIC connector (Gn+) video connector Figure 1-4. Internal View of the Midsize Computer Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 19: Advanced Expansion Subsystem

    Figure 1-5. Internal View of the Mini Tower Computer Advanced Expansion Subsystem The Dell OptiPlex Gn and Gn+ computers offer advanced expansion sub- systems that can support a mixture of traditional ISA expansion cards (called legacy cards), Plug and Play ISA expansion cards, and PCI expansion cards. The...

  • Page 20: Low-Profile Computer's Expansion-Card Slots

    The midsize computers have five expansion-card slots and a passive riser board, with no PCI-to-PCI bridge. The computer has three ISA expansion-card con- nectors and three PCI expansion-card connectors. One PCI expansion-card Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 21: Mini Tower Computer's Expansion-Card Slots

    connector and one ISA expansion-card connector share a single expansion-card slot, resulting in a total of five expansion-card slots (see Figure 1-8). ISA3 connector ISA2 connector ISA1 HDLED connector connector PCI3 connector PCI2 connector PCI1 connector Figure 1-8. Riser Board for the Midsize Computers If you have the EM version of the midsize computer, the riser board for the computer is different (see Figure 1-9).

  • Page 22: Hard-Disk Drive Options

    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, midsize, and mini tower computers. Dell OptiPlex Gn and Gn+ Systems Service Manual 1-10...

  • Page 23: Low-Profile Computers

    Low-Profile Computers The hard-disk drive assembly (consisting of the hard-disk drive and the hard- disk drive bracket) is located inside the chassis at the left front of the computer and is attached to the bottom of the chassis. One EIDE 1-inch-high hard-disk drive can be mounted on the hard-disk drive bracket.

  • Page 24: Optional Nic

    Optional NIC The Dell OptiPlex Gn+ computers have a built-in integrated 10/100-Mbps ® 3Com PCI 3C905 Ethernet NIC subsystem. The NIC provides all the func- tions of a separate 3Com 3C905 network expansion card and supports the 100BASE-TX Ethernet standards. Category 5 wiring and connections must be used.

  • Page 25: Computer Service

    omputer Service The following subsections provide service-related information about the computer. Computer Power Supply The low-profile computers have a 145-W computer power supply, whereas the midsize and mini tower computers have a 200-W computer power supply. Both computer power supplies can operate from an AC power source of 115 VAC at 60 Hz or 230 VAC at 50 Hz.

  • Page 26: Pin Assignments For The Dc Power Connectors

    +5 VDC (red) common (black) common (black) common (black) common (black) +5 VDC (red) +12 VDC (yellow) Figure 1-14. DC Power Connectors P2 (Midsize and Mini Tower), P3, P4, P5, P6, and P9 Dell OptiPlex Gn and Gn+ Systems Service Manual 1-14...

  • Page 27: Dc Power Distribution

    P2, P7 +3.3 VDC (blue/white) +3.3 VDC (blue/white) +3.3 VDC (blue/white) common (black) common (black) common (black) 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: •...

  • Page 28: Figure 1-17. Dc Power Distribution For The Low-Profile Computers

    KYBD 3.5-inch +5 VDC diskette drive MOUSE processor MICROPROCESSOR internal core regulator hard-disk drive +3.3 VDC core VCC +2.1 to +3.5 VDC Figure 1-17. DC Power Distribution for the Low-Profile Computers Dell OptiPlex Gn and Gn+ Systems Service Manual 1-16...

  • Page 29: Figure 1-18. Dc Power Cables For The Midsize

    Some computers have an additional connector (P9) that may be used instead of P5 or P6. Figure 1-18. DC Power Cables for the Midsize and Mini Tower Computers System Overview 1-17...

  • Page 30: Figure 1-19. Dc Power Distribution For The Midsize Computers

    VCC +2.1 to +3.5 VDC optional drive Some computers have an additional connector (P9) that may be used instead of P5 or P6. Figure 1-19. DC Power Distribution for the Midsize Computers Dell OptiPlex Gn and Gn+ Systems Service Manual 1-18...

  • Page 31: Figure 1-20. Dc Power Distribution For The Mini Tower Computers

    keyboard system board controller +3 VDC battery riser board power management RTC/ +3.3 VDC NVRAM logic PCI1 +5 VDC POWER1 through +12 VDC PWRGOOD PCI5 –12 VDC PSON# PSON# +5 VFP +5 VFP +5 VFP computer +5 VDC +5 VDC +5 VDC ISA1 +5 VDC...

  • Page 32: System Board

    (POWER2) diskette/tape drive interface connector primary EIDE (DSKT) (pin-1 corner) interface connector secondary EIDE (IDE1) (pin-1 corner) control panel interface connector connector (PANEL) (IDE2) (pin-1 corner) Figure 1-21. System Board Components Dell OptiPlex Gn and Gn+ Systems Service Manual 1-20...

  • Page 33: Main Memory

    Main Memory The two DIMM sockets on the system board can accommodate combinations of 16-, 32-, 64-, and 128-MB DIMMs up to a total memory capacity of 256 MB. Main memory can have either 72-bit nonparity DIMMs or 64-bit nonparity EDO DIMMs.

  • Page 34: Table 1-2. System-Board Jumper Descriptions

    BIOS Reserved Do not install jumper. One set of the speed jumper pins must have a jumper plug installed; otherwise the computer will operate at an undetermined speed. Dell OptiPlex Gn and Gn+ Systems Service Manual 1-22...

  • Page 35: Interrupt Assignments

    nterrupt Assignments Table 1-3. Interrupt Assignments IRQ Line Used By/Available IRQ0 Generated by system timer. IRQ1 Generated by keyboard controller to indicate that keyboard’s out- put buffer is full. IRQ2 Generated internally by interrupt controller to enable IRQ8 through IRQ15. IRQ3 Generated by super I/O controller to indicate that the device con- nected to serial port 2 (COM2 or COM4) requires service.

  • Page 36: Dma Channel Assignments

    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 lines. Dell OptiPlex Gn and Gn+ Systems Service Manual 1-24...

  • Page 37: Technical Specifications

    echnical Specifications Table 1-5. Technical Specifications Microprocessor Microprocessor type ..Intel Pentium microprocessor with MMX technology Microprocessor speed ..166, 200, or 233 MHz for Pentium micro- processors with MMX technology Processor bus speed .
  • Page 38 Mini tower computers ..three 5.25-inch bays for diskette drives, tape drives, CD-ROM drives, or any other devices designed for 5.25-inch bays; one 3.5-inch bay for a diskette drive Dell OptiPlex Gn and Gn+ Systems Service Manual 1-26...
  • Page 39 NIC ....RJ45 connector (on OptiPlex Gn+ models) USB....
  • Page 40 (on NIC connector)..yellow LED Power Power supply wattage: Low-profile computers . . . 145 W Midsize computers ..200 W Mini tower computers..200 W Dell OptiPlex Gn and Gn+ Systems Service Manual 1-28...
  • Page 41 Table 1-5. Technical Specifications (continued) Power (continued) Power-supply heat dissipation: Low-profile computers . . . 808 BTUs (nominal) Midsize computers ..913 BTUs (nominal) Mini tower computers ... . 913 BTUs (nominal) Power supply voltage .
  • Page 42 –16 to 10,600 m (–50 to 35,000 ft) The maximum operating temperature of 35°C (95°F) is for altitudes below 914.6 m (3000 ft). Above 914.6 m (3000 ft) the maximum operating temperature is reduced. Dell OptiPlex Gn and Gn+ Systems Service Manual 1-30...

  • Page 43: Basic Troubleshooting

    These procedures can often reveal the source of a problem or indicate the correct starting point for troubleshooting the computer. A brief explanation of how to load and start the Dell Diagnostics is located at the end of the chapter. Dell recommends that you perform the following proce- dures in the order they are presented in this chapter.

  • Page 44: External Visual Inspection

    For proper settings of the monitor controls, see the documentation for the monitor. 7. Inspect the keyboard to ensure that no keys are sticking. If one or more keys are sticking, it may be necessary to replace the keyboard. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 45: Observing The Boot Routine

    To observe problem indications during the boot routine, follow these steps: 1. Insert the Dell Diagnostics Diskette into drive A. Turn on all peripherals and the computer. If the computer is already on, press the reset button or

  • Page 46: Internal Visual Inspection

    5. Observe the monitor screen for the Diagnostics Menu. Does the Diagnostics Menu appear? Yes. See “Running the Dell Diagnostics” found later in this chapter. No. Proceed to step 6. 6. Insert another copy of the diagnostics diskette into the diskette drive, and reboot the computer.

  • Page 47: Eliminating Resource Conflicts

    Does the problem appear to be resolved? Yes. No further steps are necessary. No. Proceed to the next sections, “Eliminating Resource Conflicts,” “Run- ning the Dell Diagnostics,” and “Getting Help.” liminating Resource Conflicts Devices within the computer may require dedicated memory spaces, interrupt...

  • Page 48: Running The Dell Diagnostics

    Run Specific Tests — Tests a particular area or subsystem etting Help If none of the troubleshooting procedures in this chapter or the tests in the Dell Diagnostics reveals the source of the problem or leads to the proper trouble- shooting steps for determining the source of the problem, call Dell for technical assistance.

  • Page 49: Beep Codes And Error Messages

    If a faulty computer does not emit beep codes or display system error messages to indicate a failure, you should use the Dell Diagnostics to run the appropriate tests to help isolate the source of the problem. See “Running the Dell Diagnos- tics”...

  • Page 50: Table 3-1. Post Beep Codes

    3-1-1 Slave DMA-register failure Defective system board 3-1-2 Master DMA-register failure 3-1-3 Master interrupt-mask regis- ter failure 3-1-4 Slave interrupt-mask register failure 3-2-4 Keyboard-controller test Faulty keyboard controller failure (defective system board) Dell OptiPlex Gn and Gn+ Systems Service Manual...
  • Page 51 Table 3-1. POST Beep Codes (continued) Beep Code Error Probable Causes 3-3-4 Screen initialization failure Faulty video subsystem (defective system board) 3-4-1 Screen-retrace test failure 3-4-2 Search for video ROM failure 4-2-1 No timer tick Defective system board 4-2-2 Shutdown failure 4-2-3 Gate A20 failure 4-2-4...

  • Page 52: System Error Messages

    Keyboard controller failure • Keyboard data line failure • Keyboard stuck key failure • No timer tick interrupt • Shutdown failure • Timer chip counter 2 failed • Unexpected interrupt in protected mode Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 53: Table 3-2. System Error Messages

    Table 3-2. System Error Messages Message Definition Probable Causes BIOS found faulty disk Faulty diskette/tape drive Address mark sector or could not find subsystem or hard-disk not found particular disk sector. drive subsystem (defec- tive system board). Diskette drive or hard- Faulty interface cable or Attachment disk drive controller...
  • Page 54 Keyboard fail- ler (defective system board). Keyboard/mouse con- Defective keyboard/ Keyboard troller failed. mouse controller (defec- controller tive system board). failure Dell OptiPlex Gn and Gn+ Systems Service Manual...
  • Page 55 Table 3-2. System Error Messages (continued) Message Definition Probable Causes Computer cannot Keyboard cable connec- Keyboard data communicate with tor loose or improperly line failure keyboard. connected, defective keyboard, or defective Keyboard keyboard/mouse control- stuck key ler (defective system failure board).
  • Page 56 MS-DOS unable to Defective sectors on dis- Sector not locate sector on diskette kette or hard-disk drive. found or hard-disk drive. Dell OptiPlex Gn and Gn+ Systems Service Manual...
  • Page 57 Table 3-2. System Error Messages (continued) Message Definition Probable Causes MS-DOS unable to Defective diskette or Seek error locate specific track on hard-disk drive. diskette or hard-disk drive. Computer could not find Faulty diskette or hard- Seek opera- particular address mark disk drive.
  • Page 58 Dell Computer Cor- poration. MS-DOS cannot write Faulty diskette or hard- Write fault to diskette or hard-disk disk drive. drive. Write fault on selected drive Dell OptiPlex Gn and Gn+ Systems Service Manual 3-10...

  • Page 59: Removing And Replacing Parts On The Low-Profile Chassis

    Dell OptiPlex Gn and Gn+ low-profile computer. If you are servicing a Dell OptiPlex Gn and Gn+ midsize or mini tower computer, use Chapter 5, “Removing and Replacing Parts on the Midsize Chassis,” or Chapter 6, “Removing and Replacing Parts on the Mini Tower Chassis.”...

  • Page 60: Precautionary Measures

    If a wrist grounding strap is not available, touch an unpainted metal surface on the back of the computer to discharge any static charge from your body. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 61: Floor Stand

    loor Stand captive screw locator hole locator pin (on under- side of floor stand) securing button Figure 4-1. Optional Floor Stand Removal To remove the floor stand, if one is installed, follow these steps: 1. Place the right side of the computer on a flat work surface. 2.

  • Page 62: Computer Cover

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 63: Eject, Power, And Reset Buttons

    ject, Power, and Reset Buttons eject button computer cover (upside down) reset button power button Figure 4-4. Eject, Power, and Reset Button Removal To remove the eject, power, and reset buttons, follow these steps: 1. Lay the computer cover upside down on a flat work surface, with the back of the cover facing you.

  • Page 64: Front-Panel Inserts

    To replace a front-panel insert, position the front-panel insert, and then press the ring-tabs over the posts. If necessary, use a -inch nutdriver to reposition the ring-tabs. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 65: Figure 4-6. 3.5-Inch Front-Panel Insert Removal

    front of cover eject button mechanism inside of cover Figure 4-6. 3.5-Inch Front-Panel Insert Removal To remove a 3.5-inch front-panel insert, follow these steps: 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.

  • Page 66: Control Panel

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 67: Drives

    rives Figure 4-8 shows an example of drive hardware that can be installed in the com- puter. Refer to this figure when you perform any of the procedures in the following subsections. 3.5-inch diskette drive DC power cable diskette/tape drive interface cable system 5.25-inch drive...

  • Page 68: 3.5-Inch Diskette Drive Assembly

    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 bracket. Dell OptiPlex Gn and Gn+ Systems Service Manual 4-10...

  • Page 69: 5.25-Inch Drive Assembly

    5.25-Inch Drive Assembly front of computer drive-mounting screws (4) Figure 4-10. 5.25-Inch Drive Assembly Removal To remove a 5.25-inch drive assembly, follow these steps: 1. Remove the 3.5-inch diskette drive assembly. 2. Disconnect the DC power cable and the interface cable from the back of the 5.25-inch drive.

  • Page 70: Hard-Disk Drive Assembly

    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 before you rotate the assembly into place. Dell OptiPlex Gn and Gn+ Systems Service Manual 4-12...

  • Page 71: System Power Supply

    ystem Power Supply power supply power-supply mounting screw Figure 4-12. System Power-Supply Removal To remove the system power supply, follow these steps: 1. Disconnect the AC power cable from the back of the power supply. 2. Disconnect the DC power cables from the system board and the drives. 3.

  • Page 72: System Board Components

    EIDE front of computer (DSKT) (pin-1 corner) interface connector secondary EIDE (IDE1) (pin-1 corner) interface connector control panel (IDE2) (pin-1 corner) connector (PANEL) Figure 4-13. System Board Components Dell OptiPlex Gn and Gn+ Systems Service Manual 4-14...

  • Page 73: Expansion Cards

    Expansion Cards The computer has a removable expansion-card cage that contains the riser board and any installed expansion cards. Dell recommends that you remove the expansion-card cage first before removing or installing expansion cards. If you are not removing any of the expansion cards, leave the external cables attached to the expansion cards.

  • Page 74: Expansion Card

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 4-16...

  • Page 75: Riser Board

    Riser Board riser-board mounting screws (2) riser-board alignment slot riser board expansion-card cage Figure 4-16. Riser Board Removal To remove the riser board, follow these steps: 1. Remove the expansion-card cage and all expansion cards. 2. Lay the expansion-card cage on a flat work surface with the riser board facing up.

  • Page 76: Dimms

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 4-18...

  • Page 77: Microprocessor/Heat Sink Assembly

    Microprocessor/Heat Sink Assembly heat sink press here to release securing clip microprocessor securing clip (hooks over tabs on the socket) microprocessor socket front of computer microprocessor-socket release lever Figure 4-19. Microprocessor Securing-Clip Removal To remove the microprocessor/heat sink assembly, follow these steps: 1.

  • Page 78: Figure 4-20. Microprocessor Removal

    NOTE: Pin 1 on the microprocessor is located on the corner with the largest bevel. The pin-1 hole in the microprocessor socket is located on the corner where the holes are in a diagonal pattern. Dell OptiPlex Gn and Gn+ Systems Service Manual 4-20...

  • Page 79: System Battery

    System Battery battery BATTERY socket back of computer Figure 4-21. System Battery Removal 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 manufacturer. Discard used batteries accord- ing to the manufacturer’s instructions.

  • Page 80: System Board

    Push evenly on both sides of the system board as you slide it into position (do not twist the system board). Dell OptiPlex Gn and Gn+ Systems Service Manual 4-22...

  • Page 81: Removing And Replacing Parts On The Midsize Chassis

    Midsize Chassis his chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell OptiPlex Gn and Gn+ midsize computer. If you are servicing a Dell OptiPlex Gn and Gn+ low-profile or mini tower computer, use Chapter 4, “Removing and Replacing Parts on the Low-Profile Chassis,” or Chapter 6, “Removing and Replacing Parts on the Mini Tower Chassis.”...

  • Page 82: Precautionary Measures

    If a wrist grounding strap is not available, touch any unpainted metal surface on the back of the computer to discharge any static charge from your body. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 83: Floor Stand

    loor Stand floor stand screw Figure 5-1. Floor Stand Removal To remove the floor stand, if one is installed, follow 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.

  • Page 84: Computer Cover

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 85: Eject, Power, And Reset Buttons

    ject, Power, and Reset Buttons computer cover (upside down) eject button reset button power button Figure 5-4. Eject, Power, and Reset Button Removal To remove the eject, power, and reset buttons, follow these steps: 1. Lay the computer cover upside down on a flat work surface, with the back of the cover facing you.

  • Page 86: Front-Panel Inserts

    To replace a front-panel insert, position the front-panel insert, and then press the ring-tabs over the posts. If necessary, use a -inch nutdriver to reposition the ring-tabs. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 87: Figure 5-6. 3.5-Inch Front-Panel Insert Removal

    front of cover eject button mechanism inside of cover Figure 5-6. 3.5-Inch Front-Panel Insert Removal To remove a 3.5-inch front-panel insert, follow these steps: 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.

  • Page 88: Control Panel

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 89: Drives

    rives Figure 5-8 shows an example of drive hardware that can be installed in the com- puter. Refer to this figure when you perform any of the procedures in the following subsections. system DC power cable diskette/tape drive 3.5-inch diskette drive power supply interface cable hard-disk drive bracket...

  • Page 90: 3.5-Inch Drive Assembly

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 5-10...

  • Page 91: Figure 5-10. 5.25-Inch Drive Assembly Removal

    5.25-Inch Drive Assembly retaining tabs (2) Figure 5-10. 5.25-Inch Drive Assembly Removal To remove a 5.25-inch drive assembly from the middle or lower drive bay, fol- low these steps: 1. Disconnect the DC power cable and the interface cable from the back of the drive.

  • Page 92: Hard-Disk Drive Bracket

    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 before you rotate the bracket down into position. Dell OptiPlex Gn and Gn+ Systems Service Manual 5-12...

  • Page 93: Hard-Disk Drive

    Hard-Disk Drive drive-mounting screws (4) drive-mounting screws (4) for bottom-mounted drive for side-mounted drive hard-disk drive hard-disk drive bracket Figure 5-13. Hard-Disk Drive Removal To remove a hard-disk drive, follow these steps: 1. Remove the hard-disk drive bracket. 2. Remove the four screws that attach the hard-disk drive to the hard-disk drive bracket.

  • Page 94: System Power Supply

    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 computer. Dell OptiPlex Gn and Gn+ Systems Service Manual 5-14...

  • Page 95: System Board Components

    ystem Board Components The subsections that follow Figure 5-15 contain procedures for removing sys- tem board components. keyboard/mouse serial port 2 USB connectors connectors (stacked) connector (USB) NIC connector video connector (KYBD/MOUSE) (SERIAL2) (ENET) (Gn+ only) (MONITOR) parallel/serial port 1 connectors (stacked) (PARALLEL/SERIAL 1) battery socket...

  • Page 96: Expansion Cards

    Expansion Cards The computer has a removable expansion-card cage that contains the riser board and any installed expansion cards. Dell recommends that you remove the expansion-card cage first before removing or installing expansion cards. If you are not removing any of the expansion cards, leave the external cables attached to the expansion cards.

  • Page 97: Expansion Card

    Expansion Card retaining screw expansion card card-mounting bracket expansion-card connector card-slot opening riser board Figure 5-17. Expansion-Card Removal To remove an expansion card, follow these steps: 1. Disconnect any cables from the expansion card being removed. 2. Remove the expansion-card cage. 3.

  • Page 98: Riser Board

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 5-18...

  • Page 99: Dimms

    DIMMs securing clips Figure 5-19. DIMM Removal To remove a DIMM, push outward on the DIMM socket’s securing clips until the DIMM is released from its socket. Lift the DIMM away from the socket. securing clips 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.

  • Page 100: Microprocessor/Heat Sink Assembly

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 5-20...

  • Page 101: Figure 5-22. Microprocessor Removal

    microprocessor securing clip heat sink thermal interface pad (attached to underside of heat sink) microprocessor pin-1 corner of socket front of computer right tab microprocessor-socket release lever Figure 5-22. Microprocessor Removal If the new heat sink and microprocessor are separate, peel the thermal-pad pro- tective cover off the bottom side of the heat sink before attaching the heat sink to the microprocessor.

  • Page 102: System Battery

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 5-22...

  • Page 103: System Board

    ystem Board system board back of computer screw slots (5) tabs (5) Figure 5-24. System Board Removal To remove the system board, follow these steps: 1. Unlatch and rotate the power supply to the right (see Figure 5-14). 2. Disconnect all cables from their connectors at the back of the computer.
  • Page 104 Dell OptiPlex Gn and Gn+ Systems Service Manual 5-24...

  • Page 105: Removing And Replacing Parts On The Mini Tower Chassis

    Mini Tower Chassis his chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell OptiPlex Gn and Gn+ mini tower computer. If you are servicing a Dell OptiPlex Gn and Gn+ low-profile or midsize computer, use Chapter 4, “Removing and Replacing Parts on the Low-Profile Chassis,”...

  • Page 106: Precautionary Measures

    If a wrist grounding strap is not available, touch any unpainted metal surface on the back of the computer to discharge any static charge from your body. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 107: Computer Cover

    omputer Cover release button Figure 6-1. Computer Cover Removal To remove the computer cover, follow these steps: 1. Remove the padlock if one is installed. padlock Figure 6-2. Padlock 2. Facing the left side of the computer, press the release button at the bottom-left corner of the front bezel (see Figure 6-1).

  • Page 108: Front Bezel

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 109: Eject, Power, And Reset Buttons

    ject, Power, and Reset Buttons front bezel eject button power button reset button Figure 6-4. Eject, Power, and Reset Button Removal To remove the eject, power, and reset buttons, follow these steps: 1. Lay the front bezel on a flat work surface, with the back of the bezel facing up.

  • Page 110: Front-Panel Inserts

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 111: Figure 6-6. 3.5-Inch Front-Panel Insert Removal

    eject button mechanism back of bezel front of bezel Figure 6-6. 3.5-Inch Front-Panel Insert Removal To remove a 3.5-inch front-panel insert, follow these steps: 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.

  • Page 112: Control Panel

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 113: Drives

    rives Figure 6-8 shows an example of drive hardware that can be installed in the com- puter. Refer to this figure when you perform any of the procedures in the following subsections. diskette/tape drive 3.5-inch diskette drive interface cable DC power cable DSKT connector hard-disk drive bracket secondary EIDE...

  • Page 114: 3.5-Inch Drive Assembly

    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). Dell OptiPlex Gn and Gn+ Systems Service Manual 6-10...

  • Page 115: Figure 6-10. 3.5-Inch Diskette Drive Removal

    drive-mounting screw hooks (2) Figure 6-10. 3.5-Inch Diskette Drive 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.

  • Page 116: 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 the bottom of the 5.25-inch drive-mounting plate. Dell OptiPlex Gn and Gn+ Systems Service Manual 6-12...

  • Page 117: Hard-Disk Drive Bracket

    Hard-Disk Drive Bracket drive-cage slide rail chassis slot hinge tabs (3) sliding tab Figure 6-13. Hard-Disk Drive Bracket Removal To remove the hard-disk drive bracket, follow these steps: 1. Disconnect the DC power cable and the interface cable from the back of each hard-disk drive installed in the hard-disk drive bracket.

  • Page 118: Hard-Disk Drive

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 6-14...

  • Page 119: System Power Supply

    ystem Power Supply power supply DC power cables slot securing tab power-supply detente link Figure 6-15. System Power-Supply Removal To remove the system power supply, follow these steps: 1. Disconnect the AC power cable from the back of the power supply. 2.

  • Page 120: System Board Components

    EIDE front of computer (DSKT) (pin-1 corner) secondary EIDE interface connector interface connector control panel (IDE1) (pin-1 corner) (IDE2) (pin-1 corner) connector (PANEL) Figure 6-16. System Board Components Dell OptiPlex Gn and Gn+ Systems Service Manual 6-16...

  • Page 121: Expansion Cards

    Expansion Cards The computer has a removable expansion-card cage that contains the riser board and any installed expansion cards. Dell recommends that you remove the expansion-card cage first before removing or installing expansion cards. If you are not removing any of the expansion cards, leave the external cables attached to the expansion cards.

  • Page 122: Expansion Card

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 6-18...

  • Page 123: Riser Board

    Riser Board riser board riser-board mounting screws (2) slots (2) expansion-card cage Figure 6-19. Riser Board Removal To remove the riser board, follow these steps: 1. Remove the expansion-card cage and all expansion cards. 2. Place the expansion-card cage on a flat work surface with the riser board facing up.

  • Page 124: Dimms

    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. Dell OptiPlex Gn and Gn+ Systems Service Manual 6-20...

  • Page 125: Microprocessor/Heat Sink Assembly

    Microprocessor/Heat Sink Assembly heat sink press here to release securing clip microprocessor securing clip microprocessor-socket (hooks over tabs release lever on the socket) microprocessor socket front of computer Figure 6-22. Microprocessor Securing-Clip Removal To remove the microprocessor/heat sink assembly, follow these steps: 1.

  • Page 126: Figure 6-23. Microprocessor Removal

    NOTE: Pin 1 on the microprocessor is located on the corner with the largest bevel. The pin-1 hole in the microprocessor socket is located on the corner where the holes are in a diagonal pattern. Dell OptiPlex Gn and Gn+ Systems Service Manual 6-22...

  • Page 127: System Battery

    System Battery battery BATTERY socket back of computer Figure 6-24. System Battery Removal 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 manufacturer. Discard used batteries accord- ing to the manufacturer’s instructions.

  • Page 128: System Board

    Push evenly on both sides of the system board as you slide it into position (do not twist the system board). Dell OptiPlex Gn and Gn+ Systems Service Manual 6-24...

  • Page 129: Appendix A System Setup Program

    Appendix A System Setup Program his appendix describes the System Setup program, which is used to change the system configuration information stored in NVRAM on the system board. To enter the System Setup program, follow these steps: 1. Turn on (or reboot) the system. 2.

  • Page 130: System Setup Screens

    32 MB (EDO) IDE Hard Disk: Auto XXXXX Service Tag: Diskette: Auto Asset Tag: XXXXX Speaker: Tab,Shift-Tab change fields change values Alt-P next Esc exit Alt-B reboot Figure A-1. System Setup Screens Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 131: Table A-1. System Setup Categories

    < > 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 that can be supplied by an expansion card.
  • Page 132 Auto (default) to automatically configure a port, to a specific designation (COM1 or COM3 for Serial Port 1; COM2 or COM4 for Serial Port 2), or to Off. Dell OptiPlex Gn and Gn+ Systems Service Manual...
  • Page 133 Table A-1. System Setup Categories (continued) Category Function Parallel Port Configures system’s built-in parallel port. The port’s I/O address may be set to 378h (default), 278h or 3BCh Otherwise, the port may be disabled. Parallel Mode Controls whether system’s built-in parallel port acts as an AT-compatible (unidirectional) or PS/2-compatible (bidirectional) port.

  • Page 134: Figure A-2. Device List Screen

    Video Memory: 2 MB System Memory: 32 MB (EDO) Service Tag: XXXXX Asset Tag: XXXXX Ctrl-Del original list Ctrl move item Ctrl-Ins move to other list Ctrl return Figure A-2. Device List Screen Dell OptiPlex Gn and Gn+ Systems Service Manual...

  • Page 135: Index

    1-17 troubleshooting, 2-3 voltage ranges, 1-13 bracket, hard-disk drive removal, Dell Diagnostics, 2-6 5-12, 6-13 DIMMs installation, 4-18, 5-19, 6-20 installation guidelines, 1-21 removal, 4-18, 5-19, 6-20 types and sizes, 1-21...
  • Page 136 POST beep codes interrupt assignments, list of, 1-23 description, 3-1 ISA expansion-card connectors list of, 3-2 low-profile computer, 1-8 power button removal, 4-5, 5-5, 6-5 midsize computer, 1-8 mini tower computer, 1-9 Dell OptiPlex Gn and Gn+ Systems Service Manual...
  • Page 137 power supply system features, 1-2 about, 1-13 system memory. See memory subsystem cables, low-profile computer, 1-15 System Setup program, A-1 cables, midsize and mini tower comput- ers, 1-17 power distribution, low-profile comput- er, 1-16 power distribution, midsize computer, 1-18 tape drive removal, 4-11, 5-11, 6-11 power distribution, mini tower comput- technical specifications, 1-25 er, 1-19...
  • Page 139 ® www.dell.com Printed in the U.S.A. P/N 56023 Rev A01...

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