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Summary of Contents for Dell OptiPlex N
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- Page 2 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.
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Page 3: Table Of Contents
Contents Chapter 1 System Overview....... 1-1 System Features ..........1-2 Expansion-Card Slot . - Page 4 Diskette-Based Diagnostics ........2-8 Connecting the External Diskette Drive.
- Page 5 Figure 1-4. Riser Board ........1-4 Figure 1-5.
- Page 6 -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.
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Page 7: Chapter 1 System Overview
The Pentium microprocessor contains a built-in clock multiplier circuit, which increases the internal operating frequency to a multiple of the system clock fre- quency. The microprocessors for Dell OptiPlex N computers operate at a frequency of 166 MHz, 200 MHz, or 233 MHz, derived from a system clock frequency of 66 MHz. -
Page 8: System Features
Features In addition to the standard features found in a traditional personal computer, the Dell OptiPlex N computers include the following new and/or advanced features: • One PCI expansion-card slot on a riser board • One EIDE hard-disk drive •... -
Page 9: Figure 1-2. Front-Panel Features
Figures 1-2 and 1-3 show the system’s front-panel features and internal features, respectively. power button power indicator hard-disk drive access indicator Figure 1-2. Front-Panel Features DC power cable EIDE cable power supply padlock ring hard-disk drive security access lock security cable slot parallel port connector serial port 1... -
Page 10: Expansion-Card Slot
Cable Select jumper position. The computer’s boot drive should be connected to the primary EIDE interface (IDE1). NOTE: Although the OptiPlex N system board supports up to four EIDE devices, no devices other than the internal hard-disk drive should be connected. -
Page 11: Optional Built-In Nic
Optional Built-In NIC The Dell OptiPlex N computers offer an optional 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 12: Computer Service
Computer Power Supply The Dell OptiPlex N computers have an 80-W computer power supply. The power supply can operate from an AC power source of 115 VAC at 60 Hz or 230 VAC at 50 Hz. The computer power supply provides the DC operating volt- ages and currents listed in Table 1-1. -
Page 13: Pin Assignments For The Dc Power Connectors
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 through 1-8 show the wire side of the connectors. open +5 VDC (red) common (black) +5 VDC (red) +5 VDC (red) -
Page 14: Dc Power Distribution
Figures 1-9 and 1-10 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 Figure 1-9. DC Power Cables Dell OptiPlex N Systems Service Manual... -
Page 15: Figure 1-10. Dc Power Distribution
system board keyboard +3 VDC controller battery power RTC/ management NVRAM logic P1 POWER_1 riser board PWRGOOD PSON# PSON# +5 VFP +5 VFP computer +3.3 VDC +3.3 VDC power supply +5 VDC +5 VDC +5 VDC +5 VDC PCI1 +12 VDC +12 VDC +12 VDC +12 VDC... -
Page 16: System Board
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 1-11. System Board Components 1-10 Dell OptiPlex N Systems Service Manual... -
Page 17: 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. Although 64-bit nonparity EDO DIMMs are recommended, 72-bit parity DIMMs can also be installed. The standard main memory is 16 MB of high- speed (60-ns) nonparity memory. -
Page 18: 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. 1-12 Dell OptiPlex N Systems Service Manual... -
Page 19: Interrupt Assignments
If the EIDE controller is not in use, this line is available for other use. Although the OptiPlex N system board supports up to four EIDE devices, no devices other than the internal hard-disk drive should be connected. -
Page 20: Dma Channel Assignments
NOTES: The video controller and optional built-in NIC controller are assigned available DMA channels automatically during computer start-up. If the parallel port is in ECP mode, it uses one of the available DREQ lines. 1-14 Dell OptiPlex N Systems Service Manual... -
Page 21: Technical Specifications
Specifications Table 1-5 provides technical specifications for the OptiPlex N systems. Table 1-5. Technical Specifications Microprocessor Microprocessor type ..Intel Pentium microprocessor with MMX technology Microprocessor speed .. - Page 22 6-pin mini-DIN connector NIC (optional) ..RJ45 connector USB ....two USB-compliant connectors 1-16 Dell OptiPlex N Systems Service Manual...
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Page 23
Table 1-5. Technical Specifications (continued) Ports (continued) Internally accessible: two 40-pin connectors on PCI local bus EIDE drive ... 34-pin connector Diskette drive ..Key Combinations
... - Page 24 –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. 1-18 Dell OptiPlex N Systems Service Manual...
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Page 25: Basic Troubleshooting
Brief explanations of how to run the server-based, hard-disk–based, and diskette-based diagnostics are included in the chapter. Dell recommends that you perform the following procedures in the order they are presented in this manual. -
Page 26: External Visual Inspection
Does the inspection reveal any problems? Yes. Refer to the appropriate procedure in Chapter 4, “Removing and Replacing Parts.” No. Proceed to the next section, “Observing the Boot Routine.” Dell OptiPlex N Systems Service Manual... -
Page 27: Observing The Boot Routine
bserving the Boot Routine After you perform an external visual inspection as described in the previous section, you should boot the computer and, while the boot routine is running, observe the computer for any indications of problems. NOTE: Most of the steps in this procedure require observation of computer functions and indications, some of which can occur simultaneously. -
Page 28: Server-Based Diagnostics
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 5XXX Diagnostics and press. 7. Select Run Once or Loop Continuously to begin the tests. -
Page 29: Hard-Disk-Based Diagnostics
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 (RAM) required for loading the diagnostics. - Page 30 Based Diagnostics” in the online Network Administrator’s Guide. NOTE: Further troubleshooting requires access to the inside of the computer. If you do not want to open the computer, proceed to the last section in this chapter, “Getting Help.” Dell OptiPlex N Systems Service Manual...
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Page 31: Internal Visual Inspection
nternal Visual Inspection CAUTION: Before you proceed with the internal visual inspection described in this section, ensure that the user has saved all open files and exited all open application programs if possible. A simple visual inspection of a computer’s interior hardware can often lead to the source of a problem, such as a loose expansion card, cable connector, or mounting screw. -
Page 32: Diskette-Based Diagnostics
CAUTION: To prevent damage to the original diagnostics diskette, always use a backup copy of the diagnostics diskette when servicing a user’s computer. Dell recommends that users make several copies of this diskette to ensure that one is always available. -
Page 33: Running The Diskette-Based Diagnostics
1.44 MB, and set Diskette to Auto (see Figure A-1). Then pressto reboot the computer. Starting the diagnostics causes the Dell logo to appear on the monitor screen, followed by a message indicating that the diagnostics is loading. -
Page 34: Getting Help
Dell for technical assistance. For instructions, see “Contacting Dell” in the online Network Administrator’s Guide. -
Page 35: Beep Codes And Error Messages
Chapter 3 Beep Codes and Error Messages his chapter describes beep codes and system error messages that can occur during the POST or, in the case of some failures, during normal computer oper- ation. 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 36: 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 OptiPlex N Systems Service Manual... - Page 37 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 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...
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Page 38: 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 N Systems Service Manual... -
Page 39: 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 not found sector or could not find subsystem or hard-disk particular disk sector. drive subsystem (defec- tive system board). Diskette drive or hard- Faulty interface cable or Attachment failed to... - Page 40 (defective system board). Keyboard/mouse con- Defective keyboard/ Keyboard troller failed. mouse controller (defec- controller tive system board). failure Dell OptiPlex N Systems Service Manual...
- Page 41 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- failure ler (defective system board). Keyboard stuck key failure During memory test, Faulty or improperly...
- Page 42 (defective system board). Computer could not find Requested sec- particular sector on tor not found disk, or requested sec- tor defective. Dell OptiPlex N Systems Service Manual...
- Page 43 Table 3-2. System Error Messages (continued) Message Definition Probable Causes Disk reset operation Improperly connected 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.
- Page 44 Dell Computer Corporation. 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 OptiPlex N Systems Service Manual...
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Page 45: Removing And Replacing Parts
Chapter 4 Removing and Replacing Parts his chapter provides procedures for removing the components, assemblies, and subassemblies in the Dell OptiPlex N computer. Unless otherwise noted, each procedure assumes the following: • You have performed the steps in “Precautionary Measures” found later in this chapter. -
Page 46: 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 N Systems Service Manual... -
Page 47: Stand For Vertical Orientation
tand for Vertical Orientation captive screw locator pins (2) (on underside of stand) front bezel Figure 4-1. Optional Stand Removal To remove the stand, if one is installed, follow these steps (see Figure 4-1): 1. Place the right side of the computer on a flat work surface. 2. -
Page 48: Computer Cover
-turn clockwise to the position shown in Figure 4-3. security cable slot padlock ring service access lock Figure 4-3. Service Access Lock 3. Press the two securing buttons until the cover is free to swing up (see Figure 4-2). Dell OptiPlex N Systems Service Manual... - Page 49 4. Raise the back of the cover and pivot it toward the front of the computer. 5. Lift the cover off the hooks at the front of the chassis. Four plastic hooks at the front 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.
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Page 50: Control Panel
When you reinstall the control panel, place the control panel between the tabs in the chassis. Before reinstalling the power supply, be sure to route the control panel cable under the retention tabs on the chassis wall. Dell OptiPlex N Systems Service Manual... -
Page 51: Hard-Disk Drive
Hard-Disk Drive hard-disk drive expansion-card cage hard-disk drive mounting screws (4) Figure 4-5. Hard-Disk Drive Removal To remove the hard-disk drive, follow these steps (see Figure 4-5): 1. Disconnect the DC power cable and the EIDE cable from the back of the drive. -
Page 52: System Power Supply
Then rotate the power supply toward the front of the chassis until the retention tab snaps into place. Route the EIDE cable under the cable tabs on the power supply before reinstalling the expansion-card cage. Dell OptiPlex N Systems Service Manual... -
Page 53: System Board Components
ystem Board Components Figure 4-7 shows the location of system board components. The subsections that follow the figure contain procedures for removing system board and riser board components. keyboard/mouse serial port 2 USB connectors (2) connectors (stacked) connector (USB) connector for video connector (KYBD/MOUSE) (SERIAL2) -
Page 54: Expansion-Card Cage
Press gently downward on the back-right corner of the expansion- card cage while rotating the securing lever forward. 4-10 Dell OptiPlex N Systems Service Manual... -
Page 55: Expansion Card
Expansion Card card-slot opening expansion-card connector riser board card-mounting bracket retaining screw expansion card Figure 4-9. Expansion-Card Removal To remove an expansion card, follow these steps (see Figure 4-9): 1. Remove the expansion-card cage. 2. Remove the retaining screw from the card-mounting bracket. 3. -
Page 56: Riser Board
5. Slide the riser board to the side as shown in Figure 4-10, and then remove the riser board from the expansion-card cage. When you replace the riser board, be sure the two tabs on the expansion-card cage engage the riser board slots. 4-12 Dell OptiPlex N Systems Service Manual... -
Page 57: Dimms
DIMMs securing clips (2) Figure 4-11. DIMM Removal To remove a DIMM, push outward on the DIMM socket’s securing clips (see Figure 4-11) until the DIMM is released from its socket. Lift the DIMM away from the socket. securing clips (2) Figure 4-12. -
Page 58: Microprocessor/Heat Sink Assembly
WARNING: The microprocessor chip can get extremely hot during system operations. Be sure the chip has had sufficient time to cool before touching it. Press down on the folded part of the clip with a small screwdriver to release the clip. 4-14 Dell OptiPlex N Systems Service Manual... -
Page 59: Figure 4-14. Microprocessor Securing-Clip Removal
heat sink press here to release securing clip microprocessor securing clip (hooks over tabs on the socket) microprocessor-socket release lever microprocessor socket front of computer Figure 4-14. Microprocessor Securing-Clip Removal 2. Push outward and then upward on the microprocessor-socket release lever to rotate the lever to its fully vertical position (see Figure 4-13). -
Page 60: 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. 4-16 Dell OptiPlex N Systems Service Manual... -
Page 61: System Board
ystem Board system board back of computer screw slots (5) tabs (5) Figure 4-16. System Board Removal To remove the system board, follow these steps. CAUTION: Do not use the microprocessor heat sink as a handle when removing or installing the board. 1. - Page 62 4-18 Dell OptiPlex N Systems Service Manual...
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Page 63: 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 64: System Setup Screens
PS/2 System Memory: 32 MB (EDO) IDE Hard Disk: Auto Service Tag: XXXXX Diskette: XXXXX Asset Tag: Speaker: Alt-P next Tab,Shift-Tab change fields change values Esc exit Alt-B reboot Figure A-1. System Setup Screens Dell OptiPlex N Systems Service Manual... -
Page 65: Table A-1. System Setup Categories
IDE2 connectors on system board. Each EIDE Secondary connector supports two EIDE drives (Drive 0 and Drive 1). NOTE: Although the OptiPlex N system board supports up to four EIDE devices, no devices other than the internal hard-disk drive should be connected. - Page 66 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 378h (default), 278h or 3BCh Otherwise, the port may be disabled. Dell OptiPlex N Systems Service Manual...
- Page 67 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. IDE Hard Disk Enables system’s built-in EIDE hard-disk drive interface.
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Page 68: Figure A-2. Sample 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. Sample Device List Screen Dell OptiPlex N Systems Service Manual... -
Page 69: Index
Index hard-disk-based, 2-5 server-based, 2-4 battery removal, 4-16 DIMMs beep codes, 3-1 installation, 4-13 installation guidelines, 1-11 boot routine, observing when trouble- removal, 4-13 shooting, 2-3 types and sizes, 1-11 DMA channel assignments, 1-14 computer cover removal, 4-4 orientation, 1-2 EIDE subsystem, 1-4 technical specifications, 1-15 error messages, list of, 3-4... - Page 70 PCI expansion-card connector, 1-4 technical specifications, 1-15 POST beep codes tools, recommended, 4-1 description, 3-1 list of, 3-2 troubleshooting boot routine, 2-3 power supply external visual inspection, 2-2 about, 1-6 initial procedures, 2-1 cables, 1-8 Dell OptiPlex N Systems Service Manual...
- Page 71 internal visual inspection, 2-7 video controller, 1-4 visual inspection external, 2-2 internal, 2-7 Index...
- Page 72 Dell OptiPlex N Systems Service Manual...