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Dell OPTI PLEX GX1 Service Manual

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  • Page 1 Š...
  • Page 2 LANDesk are registered trademarks 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 names or their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.

  • Page 3: Table Of Contents

    Chassis Differences......... . . 1-2 Chassis Similarities .
  • Page 4 System-Board Service Data ....... . . 1-18 Hard-Disk Drive Service Information ......1-22 Power-Supply Service Data .
  • Page 5 Inside the Computer ......... . 4-2 Computer Cover .
  • Page 6 Expansion Cards ..........5-15 Expansion-Card Cage.
  • Page 7 Recommended Tools......... . 7-1 Precautionary Measures .
  • Page 8 Figure 1-15. Computer Orientation Information ....1-23 Figure 1-16. DC Power Connector P1 ......1-25 Figure 1-17.
  • Page 9 Figure 5-2. Optional-Stand Removal ......5-4 Figure 5-3. Computer Cover Removal ......5-5 Figure 5-4.
  • Page 10 Figure 6-22. Installing a Video-Memory Upgrade Module ... . 6-22 Figure 6-23. SEC Cartridge/Heat Sink Removal ....6-23 Figure 6-24.
  • Page 11 xiii...
  • Page 12 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 User’s 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.
  • Page 13 This manual contains field-servicing information for the Dell OptiPlex GX1/ GX1p Managed PC and OptiPlex NX1 Net PC family of computers. The Dell Opti- Plex GX1/GX1p and OptiPlex NX1 systems are high-speed (266-, 333-, 350-, 400- or 450-MHz), upgradable desktop computers built around high-performance ®...
  • Page 14 The four different chassis configurations differ primarily in the following expan- sion features: Number of expansion slots available for PCI/ISA expansion cards Number of available internal drive bays for EIDE/SCSI drives Number of available external drive bays for diskette, CD-ROM, or tape drives Physical size and power supply types (the midsize and mini tower systems use the same power supply)
  • Page 15 The microprocessor is physically located in a single-edge contact (SEC) cartridge/heat sink assembly on the system board for ease of upgrading when faster processors are available. Contact Dell Computer Corporation for informa- tion about Dell-supported microprocessor upgrades. For additional performance, the OptiPlex GX1/GX1p and OptiPlex NX1 systems employ a secondary cache memory subsystem with a cache memory control- ler and 512 KB of pipeline-burst SRAM cache memory.

  • Page 16: Standard Features

    128 MB, may be used to provide a maximum memory capacity of 384 MB. The system BIOS is implemented in flash ROM, which allows for easy BIOS upgrades using diskette files or files downloaded from Dell’s home page on the World Wide Web (www.dell.com). The BIOS also incorporates the POST diagnostics, which tests the system each time the system is started.
  • Page 17 The OptiPlex GX1/GX1p and OptiPlex NX1 systems are equipped with an inte- grated diskette drive controller (PIIX4e) that can support a maximum of two non-EIDE diskette and tape drives via a 34-pin DSKT connector located on the system board. The low-profile chassis can accommodate only one external drive device (diskette drive or tape drive).
  • Page 18 The ATI multimedia channel (AMC) implements a local graphics bus that allows external devices to attach directly to the graphics controller. The AMC allows devices to transfer video stream data to the graphics controller, for example, MPEG-2 decoding for digital video disk (DVD) applications, or to receive video stream data from the graphics controller to the device, for example, TV-Out circuitry, or to do both simultaneously.
  • Page 19 The OptiPlex GX1 systems and OptiPlex NX1 systems are available with or without an integrated Ethernet NIC subsystem. The OptiPlex GX1p systems are available only with an integrated Ethernet NIC subsystem. The integrated 10/100-Mbps 3Com supports the Wakeup On LAN feature and the 10BASE-T and 100BASE-T stan- dards.
  • Page 20 OptiPlex NX1 chassis configurations. Dell OptiPlex GX1/GX1p and OptiPlex NX1 systems have a special power sup- ply that provides trickle (“flea”) power to support the Wakeup On LAN feature when computer power is off.
  • Page 21 power button power indicator reset button Low-Profile Chassis power button power indicator reset button Midsize Chassis power button reset button Mini Tower Chassis OptiPlex NX1 Chassis diskette-drive hard-disk drive access indicator access indicator diskette-drive access indicator hard-disk drive access indicator diskette-drive access indicator power indicator...
  • Page 22 power supply padlock ring voltage selection switch AC power receptacle parallel port connector serial port 1 connector mouse connector keyboard connector USB connectors (2) serial port 2 connector 1-10 3.5-inch diskette drive audio connectors (3) NIC connector (optional) video connector security cable slot diskette/tape drive interface cable...
  • Page 23 diskette/tape drive interface cable power supply AC power receptacle voltage selection switch padlock ring parallel port connector serial port 1 connector mouse connector keyboard connector USB connectors (2) serial port 2 connector 3.5-inch diskette drive NIC connector (optional) video connector security cable slot drive cage hard-disk drive...
  • Page 24 AC power receptacle security cable slot parallel port connector serial port 1 connector keyboard connector mouse connector USB connectors (2) serial port 2 connector video connector NIC connector (optional) audio connectors (3) padlock ring 1-12 power supply riser board external drive bays hard-disk drive bracket...
  • Page 25 padlock ring security access lock parallel port connector serial port 1 connector mouse connector keyboard connector USB connectors (2) security serial port 2 connector cable slot The OptiPlex GX1/GX1p systems contain advanced expansion subsystems that can support a mixture of traditional ISA expansion cards (called legacy cards), Plug and Play ISA expansion cards, and PCI expansion cards.
  • Page 26 The OptiPlex NX1 computer has one PCI expansion-card connector on the riser board (see Figure 1-7). The computer automatically assigns any required mem- ory space, IRQ lines, and DMA channels to an installed PCI expansion card during system start-up. The Wakeup On LAN power connector on the riser board supports an optional NIC expansion card with Wakeup On LAN capabil- ity.
  • Page 27 total of five expansion-card slots (see Figure 1-9). Option 2 is an active riser board, with a PCI-to-PCI bridge. Option 2 has two ISA expansion-card connec- tors and five PCI expansion-card connectors. Two PCI/ISA expansion-card connector pairs each share an expansion-card slot, again resulting in a total of five expansion-card slots (see Figure 1-10).
  • Page 28 The OptiPlex GX1/GX1p mini tower computers have seven expansion-card slots. The riser board has four ISA expansion-card connectors and five PCI expansion-card connectors. Two PCI expansion-card connectors share expansion-card slots with two ISA connectors, resulting in a total of seven expansion-card slots (see Figure 1-11).
  • Page 29 Unless otherwise specified, the information applies to all chassis configurations. Dell OptiPlex GX1/GX1p computers are shipped with an online System User’s Guide (located in the Dell Accessories folder) that provides additional hard- ware and software installation, configuration information, and Dell contact information.
  • Page 30 Server-based and diskette-based diagnostics are available to aid in troubleshoot- ing all major components of the OptiPlex GX1 and GX1p. The OptiPlex NX1 systems use server-based diagnostics, hard-disk–based diagnostics, or the diskette-based diagnostics using an external diskette-drive kit connected directly to the system board.
  • Page 31 optional NIC microphone connector jack (MIC) (ENET) video connector line-out jack (MONITOR) (LINE-OUT) line-in jack (LINE-IN) CD-ROM audio interface connector (CD_IN) video-memory upgrade socket (VIDEO_UPGRADE) ATI multimedia connector (AMC) riser board connector (RISER) secondary EIDE interface connector (IDE2) system board jumpers serial port 2 microprocessor...
  • Page 32 The system board jumpers are located in the same corner on both the old and new system board. 500MHZ 450MHZ 400MHZ * One set of speed jumpers must have a jumper plug installed; otherwise, the system defaults to 350 MHz. 1-20 unjumpered jumpered...
  • Page 33 350MHZ Microprocessor speed 333MHZ Microprocessor speed 300MHZ Microprocessor speed 266MHZ Microprocessor speed BUS66M External system clock BIOS Reserved PSWD Password enable or disable * One set of speed jumpers must have a jumper plug installed; otherwise, the system defaults to 350 MHz. IRQ0 Generated by system timer.
  • Page 34 IRQ9 IRQ10 IRQ11 IRQ12 IRQ13 IRQ14 IRQ15 * If an ISA expansion card is configured for IRQ11, the optional NIC or PCI IRQ is assigned to another available IRQ line. DREQ0 DREQ1 DREQ2 DREQ3 DREQ4 DREQ5 DREQ6 DREQ7 NOTE: The built-in audio controller, NIC (optional), and video controllers are assigned available DMA channels automatically during system start-up.
  • Page 35 back left side front Low-Profile Chassis back bottom Mini Tower Chassis 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 1-inch-high EIDE or SCSI hard-disk drive can be mounted on the hard-disk drive bracket.
  • Page 36 The hard-disk drive bracket is located beneath the externally accessible drive bays at the front of the computer. The hard-disk drive bracket can contain either one or two 1-inch-high EIDE or SCSI hard-disk drives, or one 1-inch-high EIDE or SCSI hard-disk drive and one 1.6-inch-high EIDE or SCSI hard-disk drive.
  • Page 37 –12 VDC –10.80 to –13.20 VDC –5 VDC –4.50 to –5.50 VDC +4.75 to +5.25 VDC +5 VFP VFP (volts flea power) — sometimes called “standby power.” The power-supply output voltages can be measured at the back (wire side) of the connectors without disconnecting them.
  • Page 38 Figures 1-19 through 1-23 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 1-26 P2, P3, P5, P6, P9 +5 VDC (red) common (black) common (black)
  • Page 39 System Overview 1-27...
  • Page 40 1-28...
  • Page 41 System Overview 1-29...
  • Page 42 keyboard controller PWRGOOD PSON# +5 VFP system +5 VDC power supply –5 VDC +12 VDC –12 VDC +3.3 VDC internal hard-disk drive internal hard-disk drive 3.5-inch diskette drive optional drive optional drive Some computers have an additional connector (P9) that may be used instead of P5 or P6. 1-30 system board +3 VDC...
  • Page 43 keyboard controller POWER1 PWRGOOD PSON# PSON# +5 VFP +5 VFP system +5 VDC +5 VDC power supply –5 VDC –5 VDC +12 VDC +12 VDC –12 VDC –12 VDC POWER2 +3.3 VDC main memory sockets internal hard-disk drive DIMM_A internal DIMM_B hard-disk drive DIMM_C...
  • Page 44 +3.3 VDC +5 VDC +12 VDC –12 VDC +5 VFP The combined load on the +5-VDC and +3.3-VDC outputs should not exceed 65 W. Withstands surges of up to 3.0 A to support disk start-up operations. VFP (volts flea power) — sometimes called “standby power.” The power-supply output voltages can be measured at the back (wire side) of the connectors without disconnecting them.
  • Page 45 Figures 1-27 and 1-28 provide the following information about DC power distribution: Power-supply connector identification Power cable connection for the hard-disk drive Power distribution to sockets and connectors on the system board +3.3 VDC (blue/white) +3.3 VDC (blue/white) +3.3 VDC (blue/white) common (black) common (black) common (black)
  • Page 46 PWRGOOD PSON# +5 VFP system power supply +5 VDC +12 VDC –12 VDC +3.3 VDC internal hard-disk drive 1-34 system board +3 VDC power RTC/ management NVRAM and NIC logic P1 POWER_1 PSON# +5 VFP +3.3 VDC +5 VDC +5 VDC +12 VDC +12 VDC –12 VDC...

  • Page 47: Pentium Ii Microprocessor

    Microprocessor type ..Microprocessor speed ..External system clock ..Internal cache... . Math coprocessor ..System chip set .
  • Page 48 ISA expansion-card connectors: Low-profile computers ... Midsize computers ..Mini tower computers ... . OptiPlex NX1 computers ... NIC.
  • Page 49 Mini tower computers ... OptiPlex NX1 computers ... Internal hard-disk drive bays: Low-profile computers ... . Midsize computers .
  • Page 50 Externally accessible: Serial (DTE) ..Parallel ....Video ....PS/2-style keyboard .
  • Page 51 Reset control ... . Power control... . Power indicator ..Diskette-drive access indicator .
  • Page 52 Low-profile computers: Height ....Width ....Depth ....Weight (minimum) .
  • Page 53 Maximum shock: Operating ... . Storage ... . . Altitude: Operating ... . Storage .
  • Page 54 1-42...
  • Page 55 PC families. A brief explanation of how to load and start the system diagnos- tics is also provided at the end of the chapter. Dell recommends that you perform the following procedures in the order they are presented in this man- ual.

  • Page 56: External Visual Inspection

    The external visual inspection consists of a quick inspection of the exterior of the computer, the monitor, the keyboard, any peripherals, and cables. While performing the visual inspection, make any necessary corrections. To perform the external visual inspection, follow these steps: 1.

  • Page 57: Observing The Boot Routine

    To observe problem indications during the boot routine, follow these steps: 1. Insert a copy of 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 58: Internal Visual Inspection

    Does the Diagnostics Menu appear? Yes. See “Running the System Diagnostics” found later in this chapter. No. Proceed to step 6. 6. Insert another copy of the Dell Diagnostics Diskette into the diskette drive, and reboot the system. Does the Diagnostics Menu appear? Yes.

  • Page 59: Eliminating Resource Conflicts

    SEC cartridge/heat sink assembly and reinstall it as described in “SEC Cartridge/Heat Sink Assembly” in Chapter 4, 5, 6, or 7 , as appropriate for your system. To reseat a DIMM, remove it from its socket and reinstall it as described in “DIMMs”...

  • Page 60: Device List

    5. Enter a user name and password at the logon prompt. Contact the network administrator for information on system access. 6. Using the arrow keys, highlight Dell N 5 XXX Diagnostics and press . 7 . Select Run Once or Loop Continuously to begin the tests.
  • Page 61 ; then shut down the system and try again. Starting the diagnostics causes the Dell logo to appear on the monitor screen, followed by a message indicating that the diagnostics is loading. Before the diagnostics loads, a program tests the portion of main memory...

  • Page 62: Diskette-Based Diagnostics

    (RAM) required for loading the diagnostics. If a main memory error is detected, a message indicates which DIMM has failed. If no errors are found in main memory, the diagnostics loads and the Diagnostics Menu appears. 3. Observe the monitor screen for the Diagnostics Menu. This menu lets you choose the following options or exit to the MS-DOS prompt: If the Diagnostics Menu does not appear, check with the network admin-...
  • Page 63 kit connected to the computer as shown in Figure 2-1 and described in the fol- lowing procedure. The diskette-based diagnostics contains the same tests as the hard-disk– based diagnostics. These tests aid in troubleshooting all major components of the system. Y-cable P3 connector To install the external diskette drive, follow these steps:...

  • Page 64: Hard-Disk–Based Diagnostics (Optiplex Nx1 Systems Only)

    To run the diskette-based diagnostics, follow these steps: 1. Insert a copy of the Dell Diagnostics Diskette into the diskette drive. Turn on all peripherals and the computer. 2. For OptiPlex NX1 systems, enter the System Setup program, set Diskette Drive A to 3.5 Inch, 1.44 MB, and set Primary: under Drives: to Auto (see...
  • Page 65 This chapter describes the beep codes and error messages that are common to all members of the Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC family of computers. These error messages can occur during the POST or, in the case of some failures, during normal system operation. The tables in this chapter list faults that can cause a beep code or system error message to occur and the probable causes of the fault in each case.
  • Page 66 1-3-1 1-3-2 1-3-3 1-3-4 1-4-1 1-4-2 2-1-1 through 2-4-4 3-1-1 3-1-2 3-1-3 3-1-4 3-2-4 3-3-4 3-4-1 3-4-2 4-2-1 4-2-2 4-2-3 4-2-4 4-3-1 4-3-3 Main-memory refresh verifi- cation failure No memory installed 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...
  • Page 67 4-3-4 Time-of-day clock stopped 4-4-1 Serial-port test failure 4-4-2 Parallel-port test failure 4-4-3 Math coprocessor failure 4-4-4 Cache test failure System error messages typically are presented on the screen during the POST but can occur any time an error is detected by the system. System messages are very useful in troubleshooting the system.
  • Page 68 Computer received un- Faulty diskette, diskette recoverable data-read drive, or hard-disk drive. error from diskette or hard-disk drive. Read/write failure One or more DIMMs during POST prevents faulty or improperly system from using avail- seated. able memory. Diskette/tape drive con- Faulty or improperly troller could not locate inserted diskette,...
  • Page 69 System Setup program contains incorrect system configuration settings. System cannot commu- nicate with keyboard. Keyboard/mouse con- troller failed. During memory test, value read at address DGGUHVV, was incorrect. YDOXH YDOXH DGGUHVV YDOXH YDOXH DGGUHVV YDOXH YDOXH DGGUHVV YDOXH YDOXH DGGUHVV YDOXH YDOXH Incorrect configuration...
  • Page 70 Software in use con- Faulty application or flicts with operating utility. system, application, or utility. Memory test did not POST memory test complete. terminated by pressing the spacebar. System does not recog- Faulty diskette, diskette/ nize diskette drive or tape drive subsystem, hard-disk drive from hard-disk drive, hard-disk which it is trying to...
  • Page 71 MS-DOS unable to Defective diskette or locate specific track on hard-disk drive. diskette or hard-disk drive. System could not find Faulty diskette or hard- particular address mark disk drive. on disk. System board chip Defective system board. faulty. Backup battery low. Defective battery or faulty chip (defective system board).

  • Page 73: Precautionary Measures

    This chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell OptiPlex GX1 low-profile computer. If you are servicing a midsize, mini tower, or OptiPlex NX1 Net PC chassis, use Chapter 5, 6, or 7 , as appropriate for your system.
  • Page 74 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. Wait 5 seconds after powering down the computer before disconnecting a peripheral from the computer or removing a component from the computer’s system board to avoid possible dam- age to the system board.
  • Page 75 CD-ROM drive in external bay power supply system board Removing and Replacing Parts on the Low-Profile Chassis diskette drive drive cage for external drive internal hard- disk drive chassis intrusion switch expansion-card cage...

  • Page 76: Inside The Computer

    securing buttons (2) To remove the computer cover, follow these steps: 1. Turn off power to all peripherals, and disconnect the AC power cable from its electrical outlet. 2. Remove the padlock if one is installed. 3. Press in on the two securing buttons until the cover is free to swing up. 4.
  • Page 77 eject button computer cover (upside down) reset button power button 1. Lay the computer cover upside down on a flat work surface, with 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.
  • Page 78 To remove a front-panel insert, follow these steps: 1. Lay the computer cover upside down on 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.
  • Page 79 mounting screw control panel cable control panel To remove the control panel, follow these steps: 1. Disconnect the control panel cable from the PANEL connector on the sys- tem board. 2. From the inside of the chassis, remove the mounting screw holding the control panel to the chassis.
  • Page 80 Figure 4-6 shows an example of drive hardware that can be installed in the computer. Refer to this figure when you perform any of the procedures in the following subsections. DC power cable power supply EDFN The following subsections contain removal/replacement procedures for drives installed in the externally accessible drive bays.
  • Page 81 drive-mounting screws (2) front of computer To remove the 3.5-inch diskette drive assembly, follow these steps: 1. Disconnect the DC power cable and the interface cable from the back of the diskette drive. 2. Press the two 3.5-inch diskette-drive-assembly latches to the left to release the assembly.
  • Page 82 drive-mounting screws (4) 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. 3. Lift the 5.25-inch drive assembly straight up and out of the chassis. 4.
  • Page 83 captive screw front of computer To remove the hard-disk drive, follow these steps: 1. Disconnect the DC power cable and the interface cable from the back of the drive. 2. Loosen the captive screw that secures the hard-disk drive bracket to the chassis.
  • Page 84 power supply 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. Remove the power-supply mounting screw at the back of the chassis. 4.
  • Page 85 The computer has a removable expansion-card cage. The expansion-card cage 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 86 expansion card expansion-card connector To remove an expansion card, follow these steps: 1. Disconnect any external cables from the expansion card being removed. 2. Remove the expansion-card cage. 3. Remove the retaining screw from the card-mounting bracket. 4. Grasp the expansion card by its corners, and carefully remove it from the expansion-card connector.
  • Page 87 riser-board mounting screws (2) riser board 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. 3. Remove the two riser-board mounting screws. 4.
  • Page 88 screw slots (5) To remove the system board, follow these steps: 1. Disconnect all cables from their connectors at the back of the computer. 2. Remove the expansion-card cage. 3. Disconnect all cables from the system board. 4. Remove the screw that secures the system board to the bottom of the chassis.
  • Page 89 The following subsections contain procedures for removing/replacing system board components (see Figures 1-12 and 1-13). To remove a DIMM from one of the three DIMM sockets, follow these steps: 1. Remove the system power supply. 2. Locate the three DIMM sockets. 3.
  • Page 90 You can upgrade video memory from 4 to 8 MB by installing a video-memory upgrade module in the video-memory upgrade socket on the system board. Adding additional video memory increases the system’s video performance and provides additional modes for high-resolution/expanded color applications. To install the video memory upgrade, follow these steps: 1.
  • Page 91 To take advantage of future options in processor speed and functionality, you can replace the microprocessor on your system board with any Dell-supported microprocessor upgrade. The microprocessor upgrade kit is shipped with an SEC cartridge/heat sink assembly, which includes the microprocessor, micro- processor heat sink, and L2-cache memory module.
  • Page 92 To remove the SEC cartridge/heat sink assembly, follow these steps: 1. Remove the system power supply. 2. Locate the SEC cartridge/heat sink assembly. 3. Disconnect the microprocessor fan connector from the 3-pin connector on the system board (labeled “FAN”), located between the SERIAL2 connec- tor and the MONITOR connector.
  • Page 93 2. Turn off power to all peripherals, and disconnect the AC power cable from its electrical outlet. 3. Remove the computer cover. 4. Remove the expansion-card cage, and locate the battery in the front-right corner of the system board adjacent to the DIMM connectors. 5.
  • Page 94 4-22...
  • Page 95 This chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell OptiPlex GX1/GX1p midsize computer. If you are servicing a low-profile, mini tower, or OptiPlex NX1 Net PC chassis, use Chapter 4, 6, or 7 , as appropriate for your system.
  • Page 96 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, disconnect any telephone or telecommunication lines from the computer. 3. Wait 5 seconds after powering down the computer before disconnecting a peripheral from the computer or removing a compo- nent from the computer’s system board to avoid possible damage to the system board.
  • Page 97 3.5-inch diskette drive diskette/tape drive interface cable power supply system board external drive bays expansion-card cage Removing and Replacing Parts on the Midsize Chassis hard-disk drive bracket hard-disk drive interface cable...

  • Page 98: Optional Stand

    To remove the optional stand, follow these steps: 1. Place the right side of the computer on a flat work surface. 2. Unscrew the optional-stand screw. Use your fingers or a wide flat-blade screwdriver to unscrew the optional- stand screw. 3.

  • Page 99: Computer Cover

    securing buttons (2) To remove the computer cover, follow these steps: 1. Turn off power to all peripherals, and disconnect the AC power cable from its electrical outlet. 2. Press in on the two securing buttons until the cover is free to swing up. 3.

  • Page 100: Eject, Power, And Reset Buttons

    eject button reset button power button 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. 2. To remove the 3.5-inch diskette-drive eject button, pull gently on the plastic part of the button until it comes free.

  • Page 101: Front-Panel Inserts

    5.25-inch front-panel computer cover insert (upside down) posts (2) ring-tabs (2) To remove a front-panel insert, follow these steps: 1. Lay the computer cover upside down on 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.

  • Page 102: Control Panel

    screw To remove the control panel, follow these steps: 1. Remove the hard-disk drive bracket. 2. Disconnect the control panel cable from the PANEL connector on the sys- tem board. 3. Remove the mounting screw holding the control panel to the chassis. 4.
  • Page 103 Figure 5-7 shows an example of drive hardware that can be installed in the computer. Refer to this figure when you perform any of the procedures in the following subsections. system DC power power cable supply DSKT connector The following subsections contain removal/replacement procedures for drives installed in the externally accessible drive bays.

  • Page 104: Inch Diskette Drive Assembly

    bracket-mounting screw drive-mounting screws (2) To remove the 3.5-inch diskette drive, follow these steps: 1. Disconnect the DC power cable and the interface cable from the back of the 3.5-inch diskette drive. 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.

  • Page 105: Inch Drive Assembly

    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. 2. Press in on the two retaining tabs (one on each side of the drive), and slide the drive assembly forward to remove it.

  • Page 106: Hard-Disk Drive Bracket

    lower-back tab 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. 2. Remove the screw that secures the hard-disk drive bracket to the front of the chassis.
  • Page 107 drive-mounting screws (4) for bottom-mounted drive hard-disk drive To remove the 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. One hard-disk drive attaches to the hard-disk drive bracket at the sides of the drive.

  • Page 108: System Power Supply

    securing tab To remove the system power supply, follow these steps: 1. Disconnect the AC power cable from the back of the power supply. 2. Free the system power supply from the securing tab labeled RELEASE—> “ Press the securing tab to the left to release the power supply. 3.

  • Page 109: Expansion Cards

    The computer has a removable expansion-card cage. The expansion-card cage 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 expansion cards, leave the external cables attached to them.
  • Page 110 expansion-card connector 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. Remove the retaining screw from the card-mounting bracket. 4. Grasp the expansion card by its corners, and carefully remove it from the expansion-card connector.
  • Page 111 riser-board mounting screws (2) slots (2) expansion-card cage To remove the riser board, follow these steps: 1. Remove the expansion-card cage and all expansion cards. 2. On a flat work surface, turn the expansion-card cage over, with the riser board facing up. 3.

  • Page 112: System Board

    screw slots (5) To remove the system board, follow these steps: 1. Disconnect all cables from their connectors at the back of the computer. 2. Remove the expansion-card cage. 3. Disconnect all cables from the system board. 4. Remove the screw that secures the system board to the bottom of the chassis.

  • Page 113: System Board Components

    The following subsections contain procedures for removing/replacing system board components (see Figures 1-12 and 1-13) To remove a DIMM from one of the three DIMM sockets, follow these steps: 1. Remove the system power supply. 2. Locate the three DIMM sockets. 3.

  • Page 114: Video Memory

    You can upgrade video memory from 4 to 8 MB by installing a video-memory upgrade module in the video-memory upgrade socket on the system board. Adding additional video memory increases the system’s video performance and provides additional modes for high-resolution/expanded color applications. To install the video memory upgrade, follow these steps: 1.

  • Page 115: Microprocessor

    To take advantage of future options in processor speed and functionality, you can replace the microprocessor on your system board with any Dell-supported microprocessor upgrade. The microprocessor upgrade kit is shipped with an SEC cartridge/heat sink assembly, which includes the microprocessor, micro- processor heat sink, and L2-cache memory module.

  • Page 116: System Battery

    To remove the SEC cartridge/heat sink assembly, follow these steps: 1. Remove the system power supply. 2. Locate the SEC cartridge/heat sink assembly. 3. Disconnect the microprocessor fan connector from the 3-pin connector on the system board (labeled “FAN”), located between the SERIAL2 connec- tor and the MONITOR connector.
  • Page 117 2. Turn off power to all peripherals, and disconnect the AC power cable from its electrical outlet. 3. Remove the computer cover. 4. Remove the expansion-card cage, and locate the battery in the front-right corner of the system board adjacent to the DIMM connectors. 5.
  • Page 118 5-24...
  • Page 119 This chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell OptiPlex GX1/GX1p mini tower computers. If you are servicing a low-profile, midsize, or OptiPlex NX1 Net PC chassis, use Chapter 4, 5, or 7 , as appropriate for your system.
  • Page 120 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. Wait 5 seconds after powering down the computer before disconnecting a peripheral from the computer or removing a compo- nent from the computer’s system board to avoid possible damage to the system board.
  • Page 121 power supply system board riser board Removing and Replacing Parts on the Mini Tower Chassis external drive bays hard-disk drive bracket expansion-card cage...

  • Page 122: Front Bezel

    To remove the computer cover, follow these steps: 1. Turn off power to all peripherals, and disconnect the AC power cable from its electrical outlet. 2. Remove the padlock if one is installed. 3. Facing the left side of the computer, press the release button at the bottom-left corner of the front bezel.
  • Page 123 tab release retaining hooks (2) 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.

  • Page 124: Eject, Power, And Reset Buttons

    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 2. To remove the 3.5-inch diskette-drive eject button, pull gently on the plastic part of the button until it comes free.

  • Page 125: Front-Panel Inserts

    posts (2) 5.25-inch front-panel insert ring-tabs (2) To remove a 5.25-inch front-panel insert, follow these 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.
  • Page 126 eject button mechanism back of bezel front of bezel 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 127: Drives

    control panel cable To remove the control panel, follow these steps: 1. Remove the hard-disk drive bracket. 2. Disconnect the control panel cable from the PANEL connector on the sys- tem board. 3. Remove the mounting screw holding the control panel to the chassis. 4.
  • Page 128 Figure 6-8 shows an example of drive hardware that can be installed in the computer. Refer to this figure when you perform any of the procedures in the following subsections. DC power cable DSKT connector secondary EIDE interface connector (IDE2) The following subsections contain removal/replacement procedures for drives installed in the externally accessible drive bays.

  • Page 129: Inch Diskette Drive Assembly

    To remove a 3.5-inch diskette drive assembly, 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 forward to remove it.
  • Page 130 drive-mounting screw hooks (2) When you replace the 3.5-inch diskette drive, be sure that the two hooks on the right side of the bracket engage the mounting holes in the side of the 3.5-inch diskette drive. retaining tabs (2) 6-12...

  • Page 131: Inch Drive Assembly

    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. 2. Press in on the two retaining tabs (one on each side of the drive), and slide the drive assembly forward to remove it.

  • Page 132: Hard-Disk Drive

    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. 2. Remove the screw that secures the hard-disk drive bracket to the drive cage in the chassis.

  • Page 133: Hard-Disk Drive Assembly

    drive-mounting screws (4) for side-mounted drive hard-disk drive drive-mounting screws (4) for bottom-mounted drive To remove the hard-disk drive assembly, 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 134: System Power Supply

    power supply To remove the system power supply, follow these steps: 1. Disconnect the AC power cable from the back of the system power supply. 2. Free the system power supply from the securing tab labeled and rotate it upward until it locks. Press the securing tab to release the power supply.

  • Page 135: Expansion-Card Cage

    The computer has a removable expansion-card cage. The expansion-card cage 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 expansion cards, leave the external cables attached to them.

  • Page 136: Expansion Card

    retaining screw card-mounting bracket 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. Remove the retaining screw from the card-mounting bracket. 4. Grasp the expansion card by its corners, and carefully remove it from the expansion-card connector.
  • Page 137 riser-board mounting screws (2) slots (2) expansion-card cage 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. 3.

  • Page 138: System Board

    screw slots (5) To remove the system board, follow these steps: 1. Disconnect all cables from their connectors at the back of the computer. 2. Remove the expansion-card cage. 3. Disconnect all cables from the system board. 4. Remove the screw that secures the system board to the bottom of the chassis.

  • Page 139: Dimms

    The following subsections contain procedures for removing/replacing system board components (see Figures 1-12 and 1-13). To remove a DIMM from one of the three DIMM sockets, follow these steps: 1. Remove the system power supply. 2. Locate the three DIMM sockets. 3.

  • Page 140: Video Memory

    You can upgrade video memory from 4 to 8 MB by installing a video-memory upgrade module in the video-memory upgrade socket on the system board. Adding additional video memory increases the system’s video performance and provides additional modes for high-resolution/expanded color applications. To install the video memory upgrade, follow these steps: 1.

  • Page 141: Sec Cartridge/Heat Sink Assembly

    To take advantage of future options in processor speed and functionality, you can replace the microprocessor on your system board with any Dell-supported microprocessor upgrade. The microprocessor upgrade kit is shipped with an SEC cartridge/heat sink assembly which includes the microprocessor, micro- processor heat sink, and L2-cache memory module.

  • Page 142: System Battery

    To remove the SEC cartridge/heat sink assembly, follow these steps: 1. Remove the system power supply. 2. Locate the SEC cartridge/heat sink assembly. 3. Disconnect the microprocessor fan connector from the 3-pin connector on the system board (labeled “FAN”), located between the SERIAL2 connec- tor and the MONITOR connector.
  • Page 143 2. Turn off power to all peripherals, and disconnect the AC power cable from its electrical outlet. 3. Remove the computer cover. 4. Remove the expansion-card cage, and locate the battery in the front-right corner of the system board adjacent to the DIMM connectors. 5.
  • Page 144 6-26...
  • Page 145 This chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell OptiPlex NX1 Net PC computer. If you are ser- vicing a low-profile, midsize, or mini tower chassis, use Chapter 4, 5, or 6, as appropriate for your system.

  • Page 146: Optiplex Nx1 Computer

    Before you perform any of the procedures in this chapter, take a few moments to read the following warning for your personal safety and to prevent damage to the system from ESD. 1. Turn off the computer and any attached peripherals. 2.

  • Page 147: Optional Stand

    system board captive screw locator pins (2) (on underside of stand) front bezel To remove the optional stand, if one is installed, follow these steps: 1. Place the right side of the computer on a flat work surface. 2. Unscrew the captive screw using your fingers or a wide flat-blade screwdriver.

  • Page 148: Computer Cover

    3. Pull the optional stand away from the computer. Disengage the locator pins that position and help secure the stand to the computer. When reinstalling the optional stand, align the front edge of the stand with the groove between the front bezel and the computer cover. Move the stand until the locator pins engage the holes in the side of the computer.
  • Page 149 To remove the computer cover, follow these steps: 1. Remove the padlock, if one is installed, from the padlock ring. security cable slot padlock ring 2. Using a #2 Phillips screwdriver, rotate the service access lock clockwise to the position shown in Figure 7-4. 3.

  • Page 150: Control Panel

    mounting screw control panel cable To remove the control panel, follow these steps: 1. Remove the power supply. 2. Disconnect the control panel cable from the PANEL connector on the sys- tem board. 3. From inside the chassis, remove the mounting screw securing the control panel to the chassis.

  • Page 151: Hard-Disk Drive

    hard-disk drive mounting screws (4) To remove a hard-disk drive, follow these steps: 1. Disconnect the DC power cable and the EIDE cable from the back of the drive. 2. Disconnect any external cables from the expansion card if one is installed. 3.

  • Page 152: System Power Supply

    system- board DC power cables (2) chassis tabs (2) To remove the system power supply, follow these steps: 1. Disconnect the AC power cable from the back of the computer. 2. Disconnect the DC power cables from the system board and the hard-disk drive.

  • Page 153: Riser Board

    The computer has a removable expansion-card cage. The expansion-card cage contains the hard-disk drive, the riser board, and any installed expansion card. You must remove the expansion-card cage to remove or install the hard-disk drive, an expansion card, or the riser board. expansion-card cage To remove the expansion-card cage, follow these steps: 1.
  • Page 154 To remove the expansion card, follow these steps: 1. Disconnect any external cables from the expansion card. 2. Remove the expansion-card cage. 3. Remove the retaining screw from the card-mounting bracket. 4. Grasp the expansion card by its corners, and carefully remove it from the expansion-card connector.
  • Page 155 riser board slots (2) riser-board mounting screw To remove the riser board, follow these steps: 1. Remove the expansion-card cage. 2. Remove the expansion card if one is installed. 3. Lay the expansion-card cage on a flat work surface, with the riser board facing up.

  • Page 156: System Board

    screw slots (5) To remove the system board, follow these steps: 1. Disconnect all cables from their connectors at the back of the computer. 2. Remove the expansion-card cage. 3. Disconnect all cables from the system board. 4. Remove the screw that secures the system board to the bottom of the chassis.

  • Page 157: System Board Components

    The following subsections contain procedures for removing/replacing system board components (see Figures 1-12 and 1-13). To remove a DIMM from one of the three DIMM sockets, follow these steps: 1. Locate the three DIMM sockets. 2. To remove a DIMM, push outward on the DIMM socket’s securing clips until the DIMM is released from its socket.

  • Page 158: Video Memory

    You can upgrade video memory from 4 to 8 MB by installing a video-memory upgrade module in the video-memory upgrade socket on the system board. Adding additional video memory increases the system’s video performance and provides additional modes for high-resolution/expanded color applications. To install the video memory upgrade, follow these steps: 1.

  • Page 159: Microprocessor

    To take advantage of future options in processor speed and functionality, you can replace the microprocessor on your system board with any Dell-supported microprocessor upgrade. The microprocessor upgrade kit is shipped with a single-edge contact (SEC) cartridge/heat sink assembly which includes the microprocessor, microprocessor heat sink, and L2-cache memory module.

  • Page 160: System Battery

    To remove the SEC cartridge/heat sink assembly, follow these steps: 1. Remove the system power supply. 2. Locate the SEC cartridge/heat sink assembly. 3. Disconnect the microprocessor fan connector from the 3-pin connector on the system board (labeled “FAN”), located between the SERIAL2 connec- tor and the MONITOR connector.
  • Page 161 2. Turn off power to all peripherals, and disconnect the AC power cable from its electrical outlet. 3. Remove the computer cover. 4. Remove the expansion-card cage, and locate the battery in the front-right corner of the system board adjacent to the DIMM connectors. 5.
  • Page 162 7-18...
  • Page 163 This appendix, which applies to all Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC computer families, 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.
  • Page 164 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual configuration options key functions help title box ;;;;; ;;;;; system data ;;;;; ;;;;;...
  • Page 165 Time Resets time on computer’s internal clock. Date Resets date on computer’s internal calendar. Diskette Drive A Identifies type of diskette drives installed. Diskette Drive B Option choices always match physical loca- tions of drives in computer. Tape drives are not reflected in these options.
  • Page 166 Password Status Boot Sequence Setup Password Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual Enables or disables the chassis intrusion fea- ture. If computer cover is removed when the option is set to Enabled, the setting changes to Detected.
  • Page 167 Auto Power On Allows you to set the day and time you want the system to power on automatically. The time uses the 24-hour format. Power With the Power Management option Management enabled, DPMS monitors and most EIDE drives automatically switch into low-power mode during periods of system inactivity.
  • Page 168 SCSI adapter, installed in the computer. NOTE: Non-Plug and Play devices appear in this list as Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual Displays type of microprocessor installed. Displays size of level-2 cache memory installed.
  • Page 169 When determining the order of devices to boot from, the system first consid- ers the order of the devices listed under the Device Controller Priority option, then the order of devices under Boot Device Priority. To specify your priority preferences, order the devices under these categories so that the highest-priority controller is at the top of the Device Controller Priority option and the highest-priority device is at the top of the Boot Device Priority option.
  • Page 170 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual...
  • Page 171 3.5-inch diskette drive removal low-profile computer, 4-9 midsize computer, 5-10 mini tower computer, 6-11 5.25-inch drive assembly removal low-profile computer, 4-10 midsize computer, 5-11 mini tower computer, 6-12 AC power receptacle, 1-10 AC voltage selection switch low-profile computer, 1-10 midsize computer, 1-11 mini tower computer, 1-12 universal power supply, 1-8 ATI multimedia channel, 1-6...
  • Page 172 4-7 midsize computer, 5-8 mini tower computer, 6-9 OptiPlex NX1 computer, 7-6 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual controllers audio, 1-5 diskette/tape drive, 1-5 EIDE, 1-4 Ethernet NIC, 1-7...
  • Page 173 DC power (continued) power supply connectors, 1-33 voltage ranges, OptiPlex GX1 systems, 1-32 voltage ranges, OptiPlex NX1 systems, 1-32 diagnostics, system about, 1-18 diskette-based, 2-8, 2-10 hard-disk–based, 2-7 on OptiPlex NX1 computer, 2-9 running, 2-5 server-based, 1-18, 2-6 DIMMs installation, low-profile computer, 4-17 installation, midsize computer, 5-19 installation, mini tower computer,...
  • Page 174 6-14 options, 1-22 removal, low-profile computer, 4-11 removal, midsize computer, 5-13 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual hard-disk drives (continued) removal, mini tower computer, 6-15 removal, OptiPlex NX1 computer, service information, 1-22 SMART technology, 1-4 hard-disk–based diagnostics, 2-7...

  • Page 175: Secondary L2 Cache

    main memory, 1-4, 1-17 memory subsystem expansion using DIMMs, 1-17 flash ROM, 1-4 main memory, 1-4 secondary L2 cache, 1-3, 1-16 messages, error, 3-3 microprocessor about, 1-3 removal, low-profile computer, 4-19 removal, midsize computer, 5-21 removal, mini tower computer, 6-23 removal, OptiPlex NX1 computer, 7-15 network cable requirements, 1-7...

  • Page 176: Smart Technology

    1-24 SMART technology, 1-4 specifications, technical, 1-35 stand removal midsize computer, 5-4 OptiPlex NX1 computer, 7-3 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual subsystems audio, 1-5 expansion, 1-13 memory, 1-17 NIC, 1-7 SVGA, 1-5...

  • Page 177: Telephony Application Programming Interface

    tape drives about, 1-5 removal, low-profile computer, 4-10 removal, midsize computer, 5-11 removal, mini tower computer, 6-12 technical specifications, 1-35 telephony application programming interface, 1-6 tools, recommended low-profile computer, 4-1 midsize computer, 5-1 mini tower computer, 6-1 OptiPlex NX1 computer, 7-1 troubleshooting boot routine, 2-3 diagnostics, 2-5...
  • Page 178 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual...

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