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Dell Precision 400 Service Manual

Dell precision 400: service manual
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  • Page 1 Š ®...
  • Page 3 Š ®...
  • 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 Dual-Processor Capability .
  • Page 6 Running the Dell Diagnostics........
  • Page 7 DIMMs ..........4-20 Processor SEC Cartridge/Heat Sink Assembly .
  • Page 8 Appendix A System Setup Program ......A-1 System Setup Screens......... . . A-2 Index Figures Figure 1-1.
  • Page 9 Figure 4-20. DIMM Removal ........4-20 Figure 4-21.
  • Page 10 Tables Table 1-1. DC Voltage Ranges ....... . 1-10 Table 1-2. Jumper Descriptions .
  • Page 12 -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 pro- cedures and instructions on using the Dell Diagnostics to test the computer system.

  • Page 13: Chapter 1 System Overview

    They are available in two sizes: a midsize desktop computer and a mini tower computer. Chapters 1 through 3 and Appendix A contain information that applies to all models of the Dell WorkStation 400 systems. Chapters 4 and 5 are chassis-specific.

  • Page 14: System Features

    BIOS, which warns you at system start-up if a hard-disk drive has become unreliable. • Quick tests feature in the Dell Diagnostics (for more information about Run Quick Tests, see “Running the Dell Diagnostics” in Chapter 2). For a complete list of system features, see “Technical Specifications” found later in this chapter.

  • Page 15: Figure 1-1. Computer Orientation

    back right left back front side side front bottom Mini Tower Computer Midsize Computer Figure 1-1. Computer Orientation 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><Alt><Del>. Before you use the reset button to initiate a hardware reset, close any open application programs and files if possible.

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

    Midsize Computer diskette-drive access indicator power indicator power button hard-disk drive reset button access indicator Mini Tower Computer Figure 1-2. Front-Panel Features Dell WorkStation 400 Systems Service Manual...

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

    3.5-inch diskette drive diskette/tape drive interface cable DC power cable hard-disk drive bracket power supply AC power receptacle voltage selection switch parallel port connector chassis serial port 1 connector mouse connector system board keyboard connector serial port 2 connector expansion-card cage USB connectors (2) NIC connector...

  • Page 18: Dual-Processor Capability

    4.0 operating system. Advanced Expansion Subsystem The Dell WorkStation 400 systems offer 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. The operating...

  • Page 19: Hard-Disk Drive Options

    ® NOTE: For systems running the Microsoft Windows 95 operating system, the functions provided by the ICU are handled by the Device Manager, which can be accessed by double-clicking the System icon in the Control Panel. Windows 95 documentation provides instructions on using the Device Manager to manage resources and resolve conflicts.

  • Page 20: Enhanced Dual-Interface Eide Subsystem

    PCI expansion-card connectors (PCI1 or PCI2). Because the video adapter card connects to the 33.3-MHz PCI local bus rather than to the 8.33-MHz ISA-compatible system bus, communication between the video subsystem and the microprocessor is much faster. Dell WorkStation 400 Systems Service Manual...

  • Page 21: Nic

    Thermal Protection The microprocessor fan is self-monitoring. If the fan stops, a system alarm trig- gers a system management interrupt (SMI), which alerts the BIOS. If the Dell ThermalShutdown Service is installed, the power indicator flashes and a mes- sage appears on the monitor to alert the user that the system will shut down in an orderly manner, preventing the loss of data.

  • Page 22: Computer Service

    Pin Assignments for the DC Power Connectors The power-supply output voltages can be measured at the back (wire side) of the connectors without disconnecting them. Figures 1-6, 1-7, and 1-8 show the wire side of the connectors. 1-10 Dell WorkStation 400 Systems Service Manual...

  • Page 23: Figure 1-6. Dc Power Connector P1

    –5 VDC (white) +5 VDC (red) common (black) +5 VDC (red) +5 VDC (red) common (black) common (black) TFSC (brown) +5 VDC (red) PSON# (gray) 12 13 14 15 16 17 18 19 20 common (black) +5 VDC (red) common (black) common (black) –12 VDC (blue) +5 VDC (red)

  • Page 24: Dc Power Distribution

    Figures 1-9 and 1-10 provide the following information about DC power distribution: • Power-supply connector identification • Power cable connections for diskette, tape, CD-ROM, and hard-disk drives • Power distribution to sockets and connectors on the system board Figure 1-9. DC Power Cables 1-12 Dell WorkStation 400 Systems Service Manual...

  • Page 25: Figure 1-10. Power Distribution

    system board keyboard controller +3.3 VDC riser board battery power RTC/ management NVRAM logic PCI1 +5 VDC through +12 VDC POWER1 PCI5 PWRGOOD –12 VDC RISER PSON# PSON# +5 VFP +5 VFP +5 VDC +5 VDC +5 VDC +5 VDC ISA1, system ISA2...

  • Page 26: System Board

    DIMMs can be mixed, as follows: • There is no requirement that one socket be filled before the other, and empty sockets can be left between installed DIMMs. Dell recommends populating the sockets in order from A to D. •...

  • Page 27: System Board Jumpers

    System Board Jumpers unjumpered jumpered Figure 1-12. System Board Jumpers System Overview 1-15...

  • Page 28: Table 1-2. Jumper Descriptions

    Installed if the micro- processor’s internal speed is 266 MHz. 233MHZ Reserved. Not installed (reserved, do not change). BIOS Reserved. Not installed (reserved, do not change). PSWD Password enable/disable. Installed (password features enabled). 1-16 Dell WorkStation 400 Systems Service Manual...

  • Page 29: 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 device con- nected to corresponding serial port requires service (IRQ3 for...

  • Page 30: Dma Channel Assignments

    DREQ4 Generated by bus controller chip to activate second DMA controller DREQ5 Available DREQ6 Available DREQ7 Available NOTE: The integrated audio controller is assigned one or two DMA channels automatically during system start-up. 1-18 Dell WorkStation 400 Systems Service Manual...

  • Page 31: Technical Specifications

    echnical Specifications Table 1-5. Technical Specifications Microprocessor Microprocessor type ..Intel Pentium II microprocessor Microprocessor speed ..266 MHz internally/66 MHz externally 300 MHz internally/66 MHz externally First-level cache .
  • Page 32 Mini tower computer ..one 1.6-inch-high bay and one 1-inch-high bay for EIDE or SCSI hard-disk drives; one addi- tional 1-inch-high bay available for a third SCSI hard-disk drive 1-20 Dell WorkStation 400 Systems Service Manual...
  • Page 33 Table 1-5. Technical Specifications (continued) Ports Externally accessible: Serial (DTE) ... . two 9-pin connectors; 16550-compatible Parallel ....one 25-hole connector (bidirectional) Video .
  • Page 34 Depth ....43.7 cm (17.2 inches) Weight (minimum) ..14.3 kg (33 lb) 1-22 Dell WorkStation 400 Systems Service Manual...
  • Page 35 Table 1-5. Technical Specifications (continued) Environmental Temperature: Operating ....10 to 35 C (50 to 95 F) Storage ....–40 to 65 C (–40 to 149 F) Relative humidity .
  • Page 36 1-24 Dell WorkStation 400 Systems Service Manual...

  • Page 37: Basic Troubleshooting

    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 follow- ing procedures in the order they are presented in this chapter.

  • Page 38: 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 WorkStation 400 Systems Service Manual...

  • Page 39: 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 peripher- als and the computer. If the computer is already on, press the reset button or <Ctrl><Alt><Del> to reboot the system.

  • Page 40: 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 system.

  • Page 41: Eliminating Resource Conflicts

    Does the problem appear to be resolved? Yes. No further steps are necessary. No. Proceed to “Eliminating Resource Conflicts,” “Running the Dell Diag- nostics,” and “Getting Help” found later in this chapter. liminating Resource Conflicts...

  • Page 42: 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 43: Beep Codes And Error Messages

    If a faulty system does not emit beep codes or display system error messages to indicate a failure, you should run the appropriate tests in the Dell Diagnostics to help isolate the source of the problem. See “Running the Dell Diagnostics” in Chapter 2.

  • Page 44: Table 3-1. Post Beep Codes

    Bit failure in the first 64 KB through of main memory 2-4-4 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 Dell WorkStation 400 Systems Service Manual...
  • Page 45 Table 3-1. POST Beep Codes (continued) Beep Code Error Probable Causes 3-2-4 Keyboard-controller test Faulty keyboard controller failure (defective system board) 3-3-4 Screen initialization failure Faulty video subsystem (defective video expansion 3-4-1 Screen-retrace test failure card) 3-4-2 Search for video ROM failure 4-2-1 No timer tick Defective system board...

  • Page 46: System Error Messages

    Terminator/processor card not installed! System HALTED! • Timer chip counter 2 failed • Unexpected interrupt in protected mode • Warning: Fan failure. The system will power off • Warning: Previous shutdown due to fan failure Dell WorkStation 400 Systems Service Manual...

  • Page 47: 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). Faulty Diskette drive or hard- interface cable or Attachment disk drive controller...
  • Page 48 Keyboard ler (defective system failure board). Keyboard data line failure Keyboard stuck key failure Keyboard/mouse con- Defective keyboard/ Keyboard troller failed. mouse controller (defec- controller tive system board). failure Dell WorkStation 400 Systems Service Manual...
  • Page 49 Table 3-2. System Error Messages (continued) Message Definition Probable Causes During memory test, Faulty or improperly Memory value read at address seated DIMMs or defec- address line was incorrect. tive system board. failure at address , read value expect- ing value Memory data line failure at address ,...
  • Page 50 Reset failed failed. diskette/tape drive, hard- disk drive interface cable, or power cable. 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 WorkStation 400 Systems Service Manual...
  • Page 51 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. System could not find Faulty diskette or hard- Seek opera- particular address mark disk drive.
  • Page 52 Service or the system to fan failure BIOS shut down the computer. MS-DOS cannot write Faulty diskette or hard- Write fault to diskette or hard-disk disk drive. drive. Write fault on selected drive 3-10 Dell WorkStation 400 Systems Service Manual...

  • Page 53: Removing And Replacing Parts In The Midsize Chassis

    Midsize Chassis his chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell WorkStation 400 midsize systems. If you are ser- vicing a Dell WorkStation 400 mini tower system, use Chapter 5, “Removing and Replacing Parts in the Mini Tower Chassis.”...

  • Page 54: 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 WorkStation 400 Systems Service Manual...

  • Page 55: Floor Stand

    loor Stand floor stand screw Figure 4-1. Floor Stand Removal To remove the floor stand, 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 56: Computer Cover

    Four plastic hooks on the inside of the front part of the cover secure it to 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 WorkStation 400 Systems Service Manual...

  • Page 57: Eject, Power, And Reset Buttons

    ject, Power, and Reset Buttons computer cover (upside down) eject button 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 58: 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 help push on the ring-tabs. Dell WorkStation 400 Systems Service Manual...

  • Page 59: Control Panel

    ontrol Panel chassis hooks (2) control panel screw speaker control panel connector cable Figure 4-6. Control Panel Removal To remove the control panel, follow these steps: 1. Remove the hard-disk drive bracket. 2. Disconnect the speaker connector from the control panel. 3.

  • Page 60: Speaker

    To remove the speaker, follow these steps: 1. Remove the hard-disk drive bracket. 2. Disconnect the speaker connector from the control panel. 3. Lift the speaker out of the retaining slots on the front of the chassis. Dell WorkStation 400 Systems Service Manual...

  • Page 61: 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. externally accessible diskette/tape drive drive bays interface cable 3.5-inch diskette drive DC power cable...

  • Page 62: Externally Accessible Drive Assemblies

    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. 4-10 Dell WorkStation 400 Systems Service Manual...

  • Page 63: Figure 4-10. 5.25-Inch Drive Assembly Removal

    retaining tabs (2) Figure 4-10. 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 64: Hard-Disk Drive Bracket

    When you reinstall the hard-disk drive bracket, place the lower-back tab of the hard-disk drive bracket into position (be sure that the opening in the lower-back tab is over the alignment tab on the chassis); then rotate the front of the bracket down into position. 4-12 Dell WorkStation 400 Systems Service Manual...

  • Page 65: 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 bracket hard-disk drive Figure 4-13. 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 66: 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. 4-14 Dell WorkStation 400 Systems Service Manual...

  • Page 67: Processor Fan

    rocessor Fan lock processor fan connector latching tabs (4) power cable Figure 4-15. Processor Fan Removal To remove the processor fan, follow these steps: 1. Rotate the power supply to the right (see Figure 4-14). 2. Squeeze the latch and disconnect the fan power cable from the proces- sor fan connector (see Figure 4-16).

  • Page 68: System Board Components

    EIDE primary EIDE interface (DSKT) (pin-1 corner) interface connector control panel connector (IDE1) (IDE2) (pin-1 corner) connector (PANEL) (pin-1 corner) Figure 4-16. System Board Components 4-16 Dell WorkStation 400 Systems Service Manual...

  • Page 69: Expansion Cards

    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 the expansion cards.

  • Page 70: Expansion Card

    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. 4-18 Dell WorkStation 400 Systems Service Manual...

  • Page 71: Riser Board

    Riser Board riser board mounting screws (2) slots (2) riser board expansion-card cage Figure 4-19. 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 72: Dimms

    To replace a DIMM, press the DIMM fully into the socket (see step 1 of Figure 4-21) while closing the securing clips to lock the DIMM into the socket (see step 2 of Figure 4-21). 4-20 Dell WorkStation 400 Systems Service Manual...

  • Page 73: Processor Sec Cartridge/Heat Sink Assembly

    Processor SEC Cartridge/Heat Sink Assembly tabs (2) shroud thumbscrews (2) SEC cartridge release latches (2) heat sink SEC cartridge guide bracket assembly alignment slot Figure 4-22. Shroud and SEC Cartridge/Heat Sink Removal To remove a processor single-edge contact (SEC) cartridge/heat sink assembly, follow these steps: 1.

  • Page 74: Terminator Card

    SLOT1_SEC connector on the system board. Terminator Card terminator card guide bracket assembly Figure 4-23. Terminator Card Removal Pull straight up on the terminator card and lift it away from the guide bracket assembly to remove it. 4-22 Dell WorkStation 400 Systems Service Manual...

  • Page 75: System Battery

    System Battery battery BATTERY socket Figure 4-24. 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 76: System Board

    Push evenly on both sides of the system board as you slide it into position (do not twist the system board). 4-24 Dell WorkStation 400 Systems Service Manual...

  • Page 77: Removing And Replacing Parts In The Mini Tower Chassis

    Mini Tower Chassis his chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell WorkStation 400 mini tower systems. If you are servicing a Dell WorkStation 400 midsize system, use Chapter 4, “Removing and Replacing Parts in the Midsize Chassis.”...

  • Page 78: 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 WorkStation 400 Systems Service Manual...

  • Page 79: Computer Cover

    omputer Cover release button Figure 5-1. Computer Cover Removal To remove the computer cover, follow these steps: 1. Remove the padlock if one is installed (see Figure 1-4). 2. Facing the left side of the computer, press the release button at the bottom-left corner of the front bezel.

  • Page 80: 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 WorkStation 400 Systems Service Manual...

  • Page 81: Eject, Power, And Reset Buttons

    ject, Power, and Reset Buttons front bezel eject button power button reset button Figure 5-3. 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 82: 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, and then press the ring tabs over the posts. Dell WorkStation 400 Systems Service Manual...

  • Page 83: Figure 5-5. 3.5-Inch Front-Panel Insert Removal

    eject button mechanism back of bezel front of bezel Figure 5-5. 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 84: Control Panel

    3. Remove the mounting screw securing the control panel to the chassis. 4. Detach the control panel from the chassis hooks. Note the routing of the control panel cable as you remove it from the chassis. Dell WorkStation 400 Systems Service Manual...

  • Page 85: Speaker

    peaker speaker speaker connector Figure 5-7. Speaker Removal To remove the speaker, follow these steps: 1. Remove the hard-disk drive bracket. 2. Disconnect the speaker connector from the control panel. 3. Lift the speaker out of the retaining slots on the front of the chassis. Removing and Replacing Parts in the Mini Tower Chassis...

  • Page 86: Drives

    3.5-inch diskette drive diskette/tape drive interface cable DC power cable externally accessible drive bays hard-disk drive bracket primary EIDE connector (IDE1) EIDE cable secondary EIDE connector (IDE2) DSKT connector Figure 5-8. Drive Hardware Dell WorkStation 400 Systems Service Manual 5-10...

  • Page 87: Externally Accessible Drive Assemblies

    Externally Accessible Drive Assemblies retaining-tab release button Figure 5-9. 3.5-Inch Drive Assembly Removal 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 3.5-inch diskette drive. 2.

  • Page 88: Figure 5-10. 3.5-Inch Diskette Drive Removal

    Figure 5-10. 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. Dell WorkStation 400 Systems Service Manual 5-12...

  • Page 89: Figure 5-11. 5.25-Inch Drive Assembly Removal

    retaining tabs (2) Figure 5-11. 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 90: Figure 5-12. 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 WorkStation 400 Systems Service Manual 5-14...

  • Page 91: Hard-Disk Drive Bracket

    Hard-Disk Drive Bracket drive-cage slide rail chassis slot hinge tabs (3) sliding tab Figure 5-13. 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 92: 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 WorkStation 400 Systems Service Manual 5-16...

  • Page 93: Third Scsi Hard-Disk Drive

    Third SCSI Hard-Disk Drive third SCSI hard-disk drive 68-pin SCSI cable SCSI host adapter card Figure 5-15. Cabling for SCSI Subsystem With Three SCSI Hard-Disk Drives The mini tower chassis supports the installation of a third SCSI hard-disk drive in its own drive bracket. chassis interior divider cable connectors (2)

  • Page 94: Figure 5-17. Third Scsi Hard-Disk Drive Removal

    Figure 5-17. Third SCSI Hard-Disk Drive Removal When you replace the SCSI hard-disk drive assembly, be sure the two tabs on the left side of the bracket engage the slots on the chassis interior divider. Dell WorkStation 400 Systems Service Manual 5-18...

  • Page 95: System Power Supply

    ystem Power Supply DC power power supply cables slot power-supply detent link securing tab Figure 5-18. 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 96: Processor Fan

    4. Gently pull the plastic lock, and push down on the fan to disengage the four latching tabs holding the fan to the back of the chassis. 5. Remove the fan. Pull the fan slightly forward and out of the computer. Dell WorkStation 400 Systems Service Manual 5-20...

  • Page 97: System Board Components

    ystem Board Components The subsections that follow contain procedures for removing system board components. mouse/keyboard parallel/serial port 1 microphone jack USB connectors (2) serial port 2 connectors (stacked) connectors (stacked) connector NIC connector line-out jack processor fan connector (FAN) line-in jack battery socket riser board (BATTERY)

  • Page 98: Expansion Cards

    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 the expansion cards.

  • Page 99: Expansion Card

    Expansion Card expansion card retaining screw card-mounting bracket riser board expansion-card connector Figure 5-22. 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. Remove the retaining screw from the card-mounting bracket. 4.

  • Page 100: Riser Board

    3. Remove the two riser-board mounting screws. 4. Slide the riser board away from the securing lever until it stops; then lift the riser board away from the expansion-card cage. Dell WorkStation 400 Systems Service Manual 5-24...

  • Page 101: Dimms

    DIMMs DIMM securing clips (2) Figure 5-24. DIMM Removal To remove a DIMM, follow these steps: 1. Unlatch and rotate the power supply up until it locks (see Figure 5-18). 2. Push outward on the DIMM socket’s securing clips until the DIMM is released from its socket.

  • Page 102: Processor Sec Cartridge/Heat Sink Assembly

    5. Unscrew and remove the two thumbscrews that secure the heat sink to the system board. 6. Press the SEC cartridge release latches inward until they snap into position. Dell WorkStation 400 Systems Service Manual 5-26...

  • Page 103: Terminator Card

    7. Grasp the SEC cartridge firmly, and pull straight up on the cartridge to remove it from the guide bracket assembly. You must use up to 15 pounds of force to disengage the SEC cartridge from its connector. To install an SEC cartridge/heat sink assembly, first verify that the cartridge release latches are pulled out.

  • Page 104: 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 WorkStation 400 Systems Service Manual 5-28...

  • Page 105: System Board

    ystem Board screw slots (7) tabs (7) Figure 5-29. System Board Removal To remove the system board, follow these steps: 1. Remove the expansion-card cage. 2. Place the computer on its side on a flat surface, with the floor stand off the edge of the surface.
  • Page 106 Dell WorkStation 400 Systems Service Manual 5-30...

  • Page 107: 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 108: System Setup Screens

    Service Tag: Parallel Port: 378h Asset Tag: XXXXX Parallel Mode: PS/2 IDE Hard Disk: Auto Diskette: Auto USB: Speaker: Tab,Shift-Tab change fields change values Alt-P next Esc exit Alt-B reboot Figure A-1. System Setup Screens Dell WorkStation 400 Systems Service Manual...

  • Page 109: Table A-1. System Setup Categories

    Table A-1. System Setup Categories Category Function Time Resets time on system’s internal clock. Date Resets date on system’s internal calendar. Diskette Drive A Identifies type of diskette drives installed. Tape Diskette Drive B drives are not reflected in these categories. Drives: Identifies drives attached to the IDE1 and Primary...
  • Page 110 COM2 or COM4 for Serial Port 2), or to Off. Parallel Port Configures system’s built-in parallel port. The port’s I/O address may be set to 278H, 3BCH, or 378H. Otherwise, the port may be disabled. Dell WorkStation 400 Systems Service Manual...
  • Page 111 Table A-1. System Setup Categories (continued) Category Function Parallel Mode Controls whether system’s built-in parallel port acts as an AT-compatible (unidirectional) or PS/2-compatible (bidirectional) port. The sys- tem also supports ECP mode for Windows 95. IDE Hard Disk Enables system’s built-in EIDE hard-disk drive interface.
  • Page 112 Dell WorkStation 400 Systems Service Manual...

  • Page 113: Index

    4-4, 5-3 battery removal, 5-28 beep codes, 3-1 BIOS chip, 1-14 boot routine, observing when trouble- DC power, 1-5, 1-10, 1-12 shooting, 2-3 DC power cables, 1-5 bracket hard-disk drive, 1-5, 1-6 DC power connectors, 1-10 Dell Diagnostics, 2-6 Index...
  • Page 114 1-7 interrupt assignments, list of, 1-17 expansion subsystem, 1-6 ISA expansion cards, 1-7, 1-14 expansion-card cage removal, 4-17, 5-22 external visual inspection, 2-2 jumpers, list of, 1-16 fan connector, 1-14 fatal error messages, 3-4 Dell WorkStation 400 Systems Service Manual...
  • Page 115 PCI expansion cards, 1-7, 1-14 PCI video card, 1-8 key combination, to enter System Setup Plug and Play expansion cards, 1-6 program, A-1 POST beep codes, 3-1, 3-2 keyboard connector location, 1-5, 1-6, 1-14 power button location, 1-4 removal, 4-5, 5-5 power distribution diagram, 1-13 power indicator, 1-4 line-in jack, 1-14...
  • Page 116 1-8 system error messages, list of, 3-4 visual inspection external, 2-2 system features, 1-2 internal, 2-4 system power supply, 1-10 voltage selection switch, 1-5, 1-6 System Setup program, A-1 system specifications, 1-19 Dell WorkStation 400 Systems Service Manual...
  • Page 118 ® www.dell.com Printed in the U.S.A. P/N 84926...

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