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SERVICE MANUAL

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1. parallel port connector serial port 1 conne mouse connector RS Fs expansion card cage gt 9 expansion card slots 5 N audio connectors 3 keyboard connector USB connectors 2 serial port 2 connector video connector NIC connector Figure 1 4 Internal View of the Midsize Computer System Overview 1 7 power supply AC power receptacle external drive bays d hard disk drive parallel port connector ES bracket serial port 1 connector N keyboard connector gt l mouse connector AE i USB connectors sna Y 4 _A serial port 2 connector security cable slot interface cable video connector A g NIC AS t audio connectors 3 o expansion card cage e system board padlock ring riser board Figure 1 5 Internal View of the Mini Tower Computer Aavanced Expansion Features The Dell OptiPlex GXa systems contain advanced expansion subsystems that can support a mixture of traditional ISA expansion cards called egacy cards Plug and Play ISA expansion cards and PCI expansion cards For non Plug and Play operating system environments an ISA Configuration Utility ICU included with the computer provides a means of avoiding resource conflicts Chapter 3 Using the ISA Configuration Utility in the Ref erence and Installation Guide describes the ICU and provides instructions for using it to configure the computer In the Microsoft Windows 95 oper
2. 12 VDC yellow Figure 1 14 DC Power Connectors P2 Midsize and Mini Tower Chassis P3 P4 P5 P6 and P9 All Chassis 1 20 Dell OptiPlex GXa Systems Service Manual poco nal Ra Pa 1 2 3 4 5 6 L 43 3 VDC blue white ies 43 3 VDC blue white 43 3 VDC blue white common black common black common black Figure 1 15 DC Power Connectors P2 Low Profile Chassis and P7 All Chassis DC Power Distribution Figures 1 16 through 1 20 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 System Overview 1 21 Figure 1 16 DC Power Cables for the Low Profile Computer 1 22 Dell OptiPlex GXa Systems Service Manual P1 PWRGOOD PSON 3 VDC system board power logic management NVBRAM Panor RTC riser board a 5 VFP RISER system power supply 5 VDC 5 VDC 5 VDC 5 VDC 5 VDC 5 VDC 5 VDC 12 VDC 12 VDC 12 VDC 12 VDC 12 VDC 12 VDC 12 VDC P2 3 3 VDO POWER2 optional drive 3 5 inch diskette drive internal hard disk drive Figure 1 17 DC Power Distr
3. 6 Insert the battery into the socket with the positive side labeled facing upwards into its socket and snap it into place 7 Replace the expansion card cage replace the computer cover reconnect all cabling and reboot the system 8 Enter the System Setup program and configure the system using the information from the printouts you made earlier 9 Turn off the computer wait 10 or more minutes and reenter the System Setup program to ensure that the date and time are still correct indicat ing that the system battery is functioning correctly 4 22 Dell OptiPlex GXa Systems Service Manual Remo ving and Replacing Parts on the Midsize Chassis This chapter provides procedures for removing the components assemblies and subassemblies in the Dell OptiPlex GXa midsize computer If you are ser vicing a Dell OptiPlex GXa low profile or mini tower computer use Chapter 4 Removing and Replacing Parts on the Low Profile Chassis or Chapter 6 Removing and Replacing Parts on the Mini Tower Chassis Unless otherwise noted each procedure assumes the following e You have performed the steps in Precautionary Measures found later in this chapter You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided Recommended Tools Most of the procedures in this chapter require the use of one or more o
4. the single edge contact SEC cartridge heat sink assembly and the guide bracket assembly from the old system board and install them on the replacement board Also set the jumpers on the new sys tem board so they are identical to those on the old board unless a microprocessor upgrade is being installed When you reinstall the system board before you slide the system board back to lock it in position push down near each slot to engage the grounding clip onto its corresponding tab Push evenly on both sides of the system board as you slide it into position do not twist the system board 5 18 Dell OptiPlex GXa Systems Service Manual System Board Components The subsections that follow Figure 5 18 contain procedures for removing replacing system board components serial port 2 connector SERIAL2 microphone jack MIC line out jack LINE OUT video connector MONITOR USB connectors USB line in jack LINE IN NIC connector ENET keyboard mouse connectors stacked KYBD MOUSE parallel serial port 1 ff mr B Y connectors stacked _ eee 1 E 3 F microprocessor fan video memory ER connector FAN upgrade socket VIDEO_UPGRADE SEC cartridge CD ROM audio SLOT1 interface connector CD_IN EU DIMM sockets 3 DIMM A DIMM C main power input riser board connector RISER connector POWER 1 3 3 V power input secondary EIDE conn
5. 1 5 indicators See controls and indicators internal view low profile computer 1 7 midsize computer 1 7 mini tower computer 1 8 internal visual inspection 2 4 interrupt assignments list of 1 15 Index 3 ISA expansion card connectors low profile computer 1 9 midsize computer 1 9 mini tower computer 1 10 J jumpers list of 1 15 location 1 14 K key combination to enter System Setup program A 1 M main memory 1 3 memory subsystem expansion using DIMMs 1 11 flash ROM 1 3 level 2 cache memory 1 3 messages error 3 3 microprocessor 1 2 N network cable requirements 1 5 NIC connector information 1 4 controller 1 4 standards 1 4 Dell OptiPlex GXa Systems Service Manual P PCI expansion card connectors low profile computer 1 9 midsize computer 1 9 mini tower computer 1 10 pin assignments DC power connectors 1 20 Plug and Play expansion cards 1 8 port assignments low profile computer 1 7 midsize computer 1 7 mini tower computer 1 8 POST beep codes description 3 1 list of 3 2 power button removal low profile computer 4 5 midsize computer 5 6 mini tower computer 6 6 power distribution low profile computer 1 23 midsize computer 1 25 mini tower computer 1 26 power supply about 1 5 1 18 AC voltage ranges 1 19 cables low profile computer 1 22 cables midsize and mini tower computers 1 24 removal low profile computer 4 12 removal
6. 4 Lift the front end of the system power supply up 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 5 14 Dell OptiPlex GXa Systems Service Manual 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 of the expansion cards leave the external cables attached to the expansion cards Expansion Card Cage lever S expansion card cage Figure 5 14 Expansion Card Cage Removal To remove an expansion card cage follow these steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Lift the expansion card cage up and away from the computer To replace an expansion card cage keep the cage flush against the chassis to ensure that the lever engages the notch when the lever is depressed Removing and Replacing Parts on the Midsize Chassis 5 15 Expansion Card y DI retaining screw expansion card card mounting expansion card bracket connector card slot opening riser board Figure 5 15 Expansion Card Removal To remove an expansion card follow these steps 1 Disconnect any cables from the expansion card being removed 2 Remove the expan
7. Chapter 6 Removing and Replacing Parts on the Mini Tower Chassis llli 6 1 Recommended Fools 242 4 eicere PERSA see ee n x ens 6 1 Precautionary Medsllfes s 206 4 ooy os cee ene e ow es adea teg xs 6 2 Inside the Computer opinions Ege RECIBIR bes Pu X Ap aes 6 3 COMPRE COVER C sov ccc ewe pde b Mule Bae x cea s de to Roy ds eae 6 4 Front Bezeli ood do ia Erb eb erre ad Led o rd 6 5 Eject Power and Reset Buttons 1 65 V T us ed ACIER RR tadas 6 6 Eront Panel Inserts i ioa v hx S DURAN EAR DURAM REA 6 7 Control Panel ueste aem Tier x dae e ah d ad do id 6 9 MAY CG iore So ii pa De A M e MA DAD dM Lc 6 10 Externally Accessible Drive Assemblies 00 5 6 10 3 5 Inch Diskette Drive Assembly 00000 eee 6 11 5 25 Inch Drive Assembly 9 4 Vd er S we P Oed 6 12 Hard Disk Drive Brackets co ia a ara Ge eed 6 14 Hard Disk Drive RENE XR SX ERES RR ES 6 15 system Power SUDD y pares Es S x es Sa Pale x e de DR RR Se 6 16 Expansion Cards We ant Poen e SaL td ius CUM OE e 6 17 Expansion Card Cage nui dan A a RES YR EAR AR ERE E 6 17 Expansion Card 4 us al pai A RE E 6 18 Riser Boards 22e ew census eed od epee ete d pautas 6 19 System Board sus o ee e eee ee tona ro ide ae ea ee hd 6 20 DIMMS card anda dd ce Le Nd A tube eut 6 22 Video Memo y crias dio deca EX 6 22 INI CEO PTO CESS ON oe hie coy e dox at TA A ood RUE owe rhet 6 24 SEC Cartridge Heat Sink Assembly 0 0c ee eee 6 2
8. 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 diagnostics diskette into the diskette drive and reboot the system Does the Diagnostics Menu appear Yes See Running the System Diagnostics found later in this chapter No Proceed to the next section Internal Visual Inspection Internal 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 When you perform the visual inspection refer to Figures 1 3 through 1 5 as appropriate for your system for component location information To perform the internal visual inspection follow these steps 1 Turn off the system including any attached peripherals and disconnect all the AC power cables from their power sources 2 Remove the computer cover 2 4 Dell OptiPlex GXa Systems Service Manual 3 Verify that all chips DIMMs and expansion cards are fully seated in their sockets or connectors WARNING The SEC cartridge heat sink assembly can get extremely hot Be sure the assembly has had sufficient time to cool before you touch it
9. While reseating the SEC cartridge heat sink assembly use a wrist grounding strap or maintain contact with a metal surface on the chassis The microprocessor is physically located in a single edge contact SEC cartridge heat sink assembly on the system board To reseat the micro processor remove the SEC cartridge heat sink assembly and reinstall it as described in Removing the SEC Cartridge Heat Sink Assembly in Chap ter 4 5 or 6 as appropriate for your system To reseat a DIMM remove it from its socket and reinstall it as described in DIMMs in Chapter 4 5 or 6 as appropriate for your system If you need to reseat an expansion card remove it from its connector and reinstall it as described in Expansion Cards in Chapter 4 5 or 6 as appro priate for your system 4 Verify that all jumpers are set correctly For information about these jumpers see System Board Jumpers in Chapter 1 5 Check all cable connectors inside the computer to verify that they are firmly attached to their appropriate connectors 6 Reinstall the computer cover 7 Reconnect the computer and any attached peripherals to their power sources and turn them on Does the problem appear to be resolved Yes No further steps are necessary Terminate the procedure No Proceed to the next sections Eliminating Resource Conflicts Run ning the System Diagnostics and Getting Help Basic Troubleshoot
10. 5 1 Precautionary Measures ue herria barks Saye Ad ete Been my Poe aeg 5 2 Inside the Computers qat exer eY ua be da e OR EE WES NI Eae Gace 5 3 Hloor Stand 5 1 22 A ee bee eke ek qd EN E RE ERE dg 5 4 Computer COVer age vation ls e eel iux iE EQUES 5 5 Eject Power and Reset Buttons sse ze exem E EX WX EE Y EE M 5 6 Frt nt Panel Tnserts a Oe are Wah Os oo al es s a statutas al hd ede 5 7 Control Panel virreinato La ase LR eek bes 5 8 DONES 2200 sace hee AS pe a ee yee Se ae 5 9 Externally Accessible Drive Assemblies ooooooooooooo o 5 10 3 5 Inch Diskette Drive Assembly 0 000000 5 10 5 25 Inch Drive Assembly on 3 eid x Gag ate Bee CES 5 11 Hard Disk Drive Bracket ostias EG efr EE XERYS 5 12 HardsDiskiDnves vn seta dus iud LA a de tube asus 5 13 System Power Supply ss skA ERR AG bee ee wwe RE AG EAE ER 5 14 vii viii Expansion Cards iilo iik pd xd E RARE EROR RR d RE ES 5 15 Expatiston Card Cases s vot Sx ex Mee Ss een PS 5 15 Expansion Cand 2e ces es ouo M e a MEE dos 5 16 Riser Board i se VERTO EE SAG wEREE AS e 5 17 System BOA oy of ose e Ei RE atu EL EO d nS 5 18 System Board Components 0c eee eee eee eee eens 5 19 DIMMS A pts IS PCR AA a Lye ae rud es 5 20 Video Memory so EX RARE URINE RE kid ei 5 20 Microprocessor v se ve ER Rn Oe DO ES GS RUE 5 22 SEC Cartridge Heat Sink Assembly o ooooooomoomoomo o 5 22 System Battery z 0 ct saw MANARE OREEERA A RE EA RES 5 23
11. 64 KB of main memory 2 1 1 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 3 2 4 Keyboard controller test Faulty keyboard controller failure defective system board 3 2 Dell OptiPlex GXa Systems Service Manual Table 3 1 POST Beep Codes continued Beep Code Error Probable Causes 3 3 4 Screen initialization failure Faulty video subsystem defective system board 3 4 1 Screen retrace test failure 3 4 2 Search for video ROM failure 4 2 1 No timer tick Defective system board 4 2 2 Shutdown failure 4 2 3 Gate A20 failure 4 2 4 Unexpected interrupt in protected mode 4 3 1 Memory failure above Faulty or improperly seated address OFFFFh DIMM 4 3 3 Timer chip counter 2 failure Defective system board 4 3 4 Time of day clock stopped Bad battery or defective system board 4 4 Serial port test failure Faulty I O chip defective system board 4 4 2 Parallel port test failure Faulty system board 4 4 3 Math coprocessor failure Faulty microprocessor chip or system board 4 4 4 Cache test failure Defective microprocessor or system board System Error Messages 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
12. 9 pin connectors 16550 compatible Parallel eie es one 25 hole connector bidirectional Video cba o iade Ke one 15 hole connector PS 2 style keyboard 6 pin mini DIN PS 2 compatible MOUSE aio dra 6 pin mini DIN NIC sia pein yore RJ45 connector USB arar pad two USB compliant connectors Audio line in 2 0 V rms maximum stereo signal Audio microphone 89 mV rms maximum mono signal Audio line out 1 4 V rms maximum stereo signal at 32 ohms minimum impedance System Overview 1 29 Table 1 5 Technical Specifications continued Ports continued Internally accessible EIDE hard disk drive Diskette drive CD ROM drive two 40 pin connectors on PCI local bus 34 pin connector 4 pin connector Key Combinations lt Ctrl gt lt Alt gt lt Del gt lt Ctrl gt lt Alt gt lt Enter gt lt Ctrl gt lt Alt gt lt gt lt Ctrl gt lt Alt gt lt gt restarts reboots the system starts System Setup program during the POST only toggles microprocessor speeds on 101 key keyboard in MS DOS real mode only toggles microprocessor speeds on 102 key keyboard in MS DOS real mode only Controls and Indicators Reset control push button Power control push button Power indicator green LED Diskette drive access indicator svsopie wee EN green LED Hard disk drive access indicator green LED Link int
13. DSKT connector located on the system board System Overview 1 3 1 4 The low profile chassis can only accommodate one external drive device diskette drive or tape drive Other chassis configurations can accommodate two external drive devices NOTE If the diskette drive and tape drive are both attached to the diskette drive controller on the system board only the diskette drive is configured in the System Setup program as Drive A or Drive B The tape drive will then be listed as Not Installed under either the Drive A or Drive B category Built In SVGA Subsystem The Dell OptiPlex GXa systems include a built in high performance 64 bit accelerated graphics port AGP subsystem implemented on the system board which drives an external SVGA monitor The AGP contains a dedicated bus that bypasses the PCI bus and allows for interconnection of the video subsystem directly to the Pentium chip set for extra high performance required for 3D video subsystems This architecture also off loads the PCI bus providing greater performance for devices attached to the PCI bus The maximum supported resolutions include 1600 x 1200 pixels with 256 col ors noninterlaced and 1024 x 768 pixels with 65 536 colors noninterlaced The SVGA subsystem consists of the following major components e ATI3D Rage Pro SVGA video controller e 2 MB synchronous graphics random access memory SGRAM video memory expandable to 4 MB via a video memory upgrade kit e 1
14. Figure 5 21 Figure 5 22 Figure 5 23 Figure 6 1 Figure 6 2 Figure 6 3 Figure 6 4 Figure 6 5 Figure 6 6 Figure 6 7 Figure 6 8 Figure 6 9 Figure 6 10 Figure 6 11 Figure 6 12 Figure 6 13 Figure 6 14 Figure 6 15 Figure 6 16 Figure 6 17 Figure 6 18 Figure 6 19 Figure 6 20 Figure 6 21 Figure 6 22 Figure 6 23 Figure 6 24 Figure 6 25 Figure A 1 DIMM Installation 0 0 000 RR RII 5 20 Installing a Video Memory Upgrade Module 5 21 SEC Cartridge Heat Sink Removal 5 22 System Battery Installation o oooooooo o 5 23 Internal View of the Mini Tower Computer 6 3 Computer Cover Removal 0 00000 eee eee ee 6 4 Bront Bezel Removal uei a ee hee 6 5 Eject Power and Reset Button Removal 6 6 5 25 Inch Front Panel Insert Removal 6 7 3 5 Inch Front Panel Insert Removal 6 8 Control Panel Removal srta A 6 9 DAYS Hard Ware A a Gals eo ae Re eta ered 6 10 3 5 Inch Diskette Drive Assembly Removal 6 11 3 5 Inch Diskette Drive Bracket 255 re eee aa gees 6 12 5 25 Inch Drive Assembly Removal 6 12 5 25 Inch Drive Removal a abst be dia ST S 6 13 Hard Disk Drive Bracket Removal 6 14 Hard Disk Drive Removal o o oooooooomoomo 6 15 System Power Supply Removal o oo ooooooo o 6 16 Expansion Card Cage R
15. If you wait too long and the operating system begins to load into memory let the system complete the load operation then shut down the system and try again NOTE To ensure an orderly system shutdown consult the documentation that accompanied the operating system System Setup Program A 1 System Setup Screens Dell Computer Corporation www dell com Page 1 of 2 System OptiPlex GXa 233M Setup BIOS Version XXX Time 13 17 02 Date Mon Sept 1 1997 Diskette Drive A 3 5 inch 1 44 MB This category sets the time in 24 hour format hours minutes Disk Dri B Not Installed i TENS seconds for the internal clock calendar Drives Primary Type Cyls Hds Pre LZ Sec Size To change the value in a field Drive 0 Auto 1023 64 sl 102363 2111 enter a number or use the left Drive 1 None or right arrow key Secondary Changes tak ffect immediately Drive 0 Auto CD ROM Device Drive 1 None Pentium II Processor 233 MHz Reserved Memory None L 1 2 Cache CPU Speed 233 MHZ eve ache 512 KB Integrated System Memory 16 MB SDRAM um Lock On Video Memory 2 MB SGRAM Service Tag XXXXX Asset Tag XXXXX Tab Shift Tab change fields change values Alt P next Esc exit Alt B reboot Dell Computer Corporation www dell com Page 2 of 2 System OptiPlex GXa 233M Setup BIOS Version XXX Keyboard Errors Report This category sets whether key
16. diagnosing computer failures that occur during the POST Initial User Contact When you first contact a user who has a problem ask the user to describe the problem and the conditions under which it occurs In particular was the user installing new hardware or software when the failure occurred A verbal description can often indicate the cause of a problem or indicate the appropriate troubleshooting procedure to use After the user describes the problem follow these steps 1 Ask the user to back up any data on the hard disk drive if the system s condition permits See Maintaining the System in the online System User s Guide for infor mation about backing up data 2 Ask the user to try to duplicate the problem by repeating the operations he or she was performing at the time the problem occurred Can the user duplicate the problem Yes Proceed to step 3 No Proceed to the next section External Visual Inspection 3 Observe the user to determine if he or she is making an error such as typing an incorrect key combination or entering a command incorrectly Is the problem a result of user error Yes Instruct the user in the proper procedure or direct him or her to the appropriate user documentation for the correct procedure No Proceed to the next section External Visual Inspection Basic Troubleshooting 2 1 2 2 External Visual Inspection The external visual inspection consists of a quick in
17. 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 Expansion Card Cage chassis expansion card cage bottom slot lever Figure 6 16 Expansion Card Cage Removal To remove an expansion card cage follow these steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Slide the expansion card cage out of the computer To replace an expansion card cage align the tabs on the left and right sides of the expansion card cage with the slots on the back and bottom of the chassis With the securing lever in its extended position slide the expansion card cage into place Removing and Replacing Parts on the Mini Tower Chassis 6 17 Expansion Card expansion card retaining screw um es bracket Hi I I card slot opening riser board expansion card connector Figure 6 17 Expansion Card Removal To remove an expansion card follow these steps 1 Disconnect any cables from the expansion card being removed 2 Remove the expansion card cage 3 Remove the retaining screw from the card mounting bracket 4 Grasp the expansion card by its corners and carefully remove it from the expansion ca
18. midsize computer 5 14 removal mini tower computer 6 16 precautionary measures low profile computer 4 2 midsize computer 5 2 mini tower computer 6 2 primary EIDE connector low profile computer 4 8 midsize computer 5 9 mini tower computer 6 10 R removing and replacing parts low profile computer 4 1 midsize computer 5 1 mini tower computer 6 1 reset button removal low profile computer 4 5 midsize computer 5 6 mini tower computer 6 6 resource conflicts eliminating 2 6 riser board removal low profile computer 4 15 midsize computer 5 17 mini tower computer 6 19 S SEC cartridge heat sink assembly about 1 11 4 20 removal low profile computer 4 20 removal midsize computer 5 22 removal mini tower computer 6 24 secondary cache memory 1 3 secondary EIDE connector low profile computer 4 8 midsize computer 5 9 mini tower computer 6 10 SMART technology 1 3 specifications technical 1 27 subsystems audio 1 4 expansion 1 8 memory 1 11 NIC 1 4 SVGA 1 4 switch AC voltage selection 1 5 1 7 system battery removal low profile computer 4 21 midsize computer 5 23 mini tower computer 6 25 system board component locations 1 12 features 1 12 jumpers 1 14 removal low profile computer 4 16 removal midsize computer 5 18 removal mini tower computer 6 20 system diagnostics about 1 12 running 2 6 system error messages list of 3 3 system power supply re
19. power supply power supply mounting screw Figure 4 10 System Power Supply Removal To remove the system power supply follow these steps 1 Disconnect the AC power cable from the back of the power supply 2 Disconnect the DC power cables from the system board and the drives 3 Remove the power supply mounting screw at the back of the chassis 4 Slide the system power supply forward until it stops then lift it from the chassis When you replace the system power supply place it down inside the chassis and against the right side of the chassis Then slide the system power supply toward the back of the chassis and hook the tabs into the right side of the power supply WARNING The voltage select switch located on the back of the power supply assembly must be set to the correct operating voltage 115 V or 230 V before the power cable is plugged into an AC outlet Dell OptiPlex GXa Systems Service Manual 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 of the expansion cards leave the external cables attached to the expansion cards Expansion Card Cage lever expansion card cage Figure 4 11 Expansion Card Cage Removal To remove an expansion card cage follow these
20. replace the riser board be sure the alignment feature on the expansion card cage engages with the alignment slot Removing and Replacing Parts on the Low Profile Chassis 4 15 System Board screw 4 d gs slots 5 A tabs 5 oe Figure 4 14 System Board Removal 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 5 Slide the system board toward the front of the chassis until it stops 6 Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board NOTE If you are replacing the system board remove all DIMMs the video memory upgrade module if present the single edge contact SEC cartridge heat sink assembly and the guide bracket assembly from the old system board and install them on the replacement board Also set the jumpers on the new sys tem board so they are identical to those on the old board unless a microprocessor upgrade is being installed When you reinstall the system board before you slide the system board back to lock it in position push down near each slot to engage the grounding clip onto its corresponding tab Push evenly on both sides of the system board as you slide it into position do not twist the sys
21. steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Lift the expansion card cage up and away from the computer To replace an expansion card cage keep it flush against the chassis to ensure that the lever engages the notch in the chassis when the lever is depressed Removing and Replacing Parts on the Low Profile Chassis 4 13 Expansion Card gt i retaining screw E expansion card card mounting bracket expansion card neces A O D a card slot opening riser board Figure 4 12 Expansion Card Removal 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 4 14 Dell OptiPlex GXa Systems Service Manual Riser Board riser board mounting screws 2 riser board riser board alignment expansion card cage Figure 4 13 Riser Board Removal To remove the riser board follow these steps 1 2 3 4 Remove the expansion card cage and all expansion cards Lay the expansion card cage on a flat work surface with the riser board facing up Remove the two riser board mounting screws Lift the riser board away from the expansion card cage When you
22. the new video memory upgrade module Removing and Replacing Parts on the Midsize Chassis 5 21 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 You may also have to reseat or replace an SEC cartridge heat sink assembly during normal maintenance SEC Cartridge Heat Sink Assembly SEC cartridge release latches 2 heat sink SEC cartridge heat sink clips 2 guide bracket assembly Q metal standoffs 2 p E Figure 5 22 SEC Cartridge Heat Sink Removal 5 22 Dell OptiPlex GXa Systems Service Manual To remove the SEC cartridge heat sink assembly follow these steps 1 Remove the system power supply WARNING The SEC cartridge heat sink assembly can get extremely hot during system operations Be sure that the assembly has had suffi cient time to cool before touching it 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 serial port 2 connector and the video connector see Figure 5 18 4 Release the two securing clips near the base of the heat sink from the met
23. the video memory upgrade socket and or video memory upgrade module the module is keyed and must be correctly positioned before inserting it into the socket 2 Orient the video memory upgrade module as shown in Figure 5 21 Then carefully align the module s edge connector pins with the socket ensuring that the slot in the module mates with the socket key notch ZO a de video memory video memory upgrade socket upgrade module Figure 5 21 Installing a Video Memory Upgrade Module 3 Press the video memory upgrade module firmly into the socket and pivot the module downward until the module clicks into place NOTE If you do not hear a sharp click when installing the video memory upgrade module remove the module and repeat steps 2 and 3 4 Replace the expansion card cage 5 Replace the computer cover and reconnect the AC power cable to the AC outlet Press the power switch on the computer to reboot the system NOTE As the system boots it automatically detects the presence of the new video memory upgrade module and automatically changes the system con figuration information in the System Setup program 6 Enter the System Setup program and confirm that 4 MB is shown in the Video Memory category If the total memory is listed incorrectly repeat steps 1 through 6 to reseat the video memory upgrade module and ver ify that the computer acknowledges the module 7 Run the system diagnostics Video Test Group to test
24. use a small screw driver and push in on the two or three plastic clips that hold the button to the bezel When these clips are released the button comes free from the bezel 6 6 Dell OptiPlex GXa Systems Service Manual Front Panel Inserts front bezel us E 5 25 inch front panel insert ring tabs 2 Figure 6 5 5 25 Inch Front Panel Insert Removal 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 To replace a 5 25 inch front panel insert position the two ring tabs over the posts on the inside of the bay opening then press the ring tabs over the posts Removing and Replacing Parts on the Mini Tower Chassis 6 7 6 8 eject button mechanism S ES e back of bezel front of bezel Figure 6 6 3 5 Inch Front Panel Insert Removal To remove a 3 5 inch front panel insert follow these steps 1 Hold the bezel with the front facing you 2 Inside the bezel press the eject button mechanism toward the front panel to snap the plastic insert out of its opening To replace the front panel insert for the 3 5 inch bay work from outside the bezel Place the insert in position and press it into the opening Dell OptiPlex GXa Systems Service Manual Control Panel chassis hooks 2 control panel cable Figure 6 7 Control Pa
25. 0h Drives Externally accessible bays Low profile computers Midsize computers Mini tower computers one 3 5 inch bay dedicated to a 3 5 inch diskette drive one 5 25 inch bay for a dis kette drive tape drive or CD ROM drive one 3 5 inch bay dedicated to a 3 5 inch diskette drive two 5 25 inch bays for dis kette drives tape drives or CD ROM drives one 3 5 inch bay dedicated to a 3 5 inch diskette drive three 5 25 inch bays for dis kette drives tape drives or CD ROM drives 1 28 Dell OptiPlex GXa Systems Service Manual Table 1 5 Technical Specifications continued Drives continued Internal hard disk drive bays Low profile computers one bay for a 1 inch high EIDE or SCSI hard disk drive Midsize computers two bays for either one or two 1 inch high EIDE or SCSI hard disk drives or one inch high EIDE or SCSI hard disk drive and one 1 6 inch high EIDE or SCSI hard disk drive Mini tower computers two bays for either one or two 1 inch high EIDE or SCSI hard disk drives or one inch high EIDE or SCSI hard disk drive and one 1 6 inch high EIDE or SCSI hard disk drive Video Video type ATI 3D Rage Pro built in SVGA controller attached to the AGP bus Video memory 2 MB SGRAM upgradable to 4 MB Maximum video resolution 1280 x 1024 pixels with 256 colors Ports Externally accessible Serial DTE 2222 344 605 two
26. 1 Bus Speeds vet ov dme PCI 33 MHz ISA 8 25 MHz PCI expansion card connectors Low profile computers two one PCI connector and one ISA connector share an expansion card slot Midsize computers three one PCI connector and one ISA connector share an expansion card slot Dur two share expansion card slots Mini tower computers five two PCI connectors share expansion card slots with ISA connectors System Overview 1 27 Table 1 5 Technical Specifications continued Expansion Bus continued ISA expansion card connectors Low profile computers Midsize computers Mini tower computers two one ISA connector and one PCI connector share an expansion card slot three one ISA connector and one PCI connector share an expansion card slot or two both share expansion card slots four two ISA connectors share expansion card slots with PCI connectors NIC NIC care eux EUIS eee integrated 3Com PCI 3C905 network con troller operating at 10 or 100 Mb sec Memory Architecture ere ees 64 bit nonparity or 72 bit parity non DIMM sockets DIMM capacities Standard RAM Maximum RAM L2 cache memory BIOS address interleaved three gold contacts 16 and 32 MB nonparity SDRAM 32 64 and 128 MB parity SDRAM 16 MB 324 MB 512 MB pipeline burst direct mapped write back SRAM OF000
27. 3 Figure 1 18 DC Power Cables for the Midsize and Mini Tower Computers ces vx exe REVUES URS 1 24 Figure 1 19 DC Power Distribution for the Midsize Computer 1 25 Figure 1 20 DC Power Distribution for the Mini Tower Computer 1 26 Figure 4 1 Internal View of the Low Profile Computer 4 3 Figure 4 2 Figure 4 3 Figure 4 4 Figure 4 5 Figure 4 6 Figure 4 7 Figure 4 8 Figure 4 9 Figure 4 10 Figure 4 11 Figure 4 12 Figure 4 13 Figure 4 14 Figure 4 15 Figure 4 16 Figure 4 17 Figure 4 18 Figure 4 19 Figure 4 20 Figure 5 1 Figure 5 2 Figure 5 3 Figure 5 4 Figure 5 5 Figure 5 6 Figure 5 7 Figure 5 8 Figure 5 9 Figure 5 10 Figure 5 11 Figure 5 12 Figure 5 13 Figure 5 14 Figure 5 15 Figure 5 16 Figure 5 17 Figure 5 18 Figure 5 19 Computer Cover Removal 0 000 002 eee eee 4 4 Eject Power and Reset Button Removal 4 5 Front Panel Insert Removal 0 002002 eee aes 4 6 Control Panel Removal a evo rr Mew Ae ee 4 7 Drive Hardware cose souder bak ee BA RENE 4 8 3 5 Inch Diskette Drive Removal 6 5 4 9 5 25 Inch Drive Assembly Removal 4 10 Hard Disk Drive Assembly Removal 4 11 System Power Supply Removal 000 4 12 Expansion Card Cage Removal momo 4 13 Expansion Card Removal 0 0 0 0 eee eee 4 14 Riser Board Removal e
28. 4 System Battery sess a eh nv ka Eka a Wale ee Ey heed 6 25 Appendix A System Setup PrograM o oooooooooooooo A 1 System Setup SCIEETIS xou SERERE e a SUE UA A 2 Index Figures Figure 1 1 Chassis Configurations 00 cee eee eee ee 1 1 Figure 1 2 Front Panel Features socer a 1 6 Figure 1 3 Internal View of the Low Profile Computer 1 7 Figure 1 4 Internal View of the Midsize Computer 1 7 Figure 1 5 Internal View of the Mini Tower Computer 1 8 Figure 1 6 Riser Board for the Low Profile Computer 1 9 Figure 1 7 Riser Board for the Midsize Computer Option 1 1 10 Figure 1 8 Riser Board for the Midsize Computer Option 2 1 10 Figure 1 9 Riser Board for the Mini Tower Computer 1 11 Figure 1 10 System Board Components 0000005 1 13 Figure 1 11 System Board Jumpers 0 0 00 cece eee eee 1 14 Figure 1 12 Computer Orientation Information 1 17 Figure 1 13 DC Power Connector Pl oooooooooocoomooo o 1 20 Figure 1 14 DC Power Connectors P2 Midsize and Mini Tower Chassis P3 P4 P5 P6 and P9 All Chassis 1 20 Figure 1 15 DC Power Connectors P2 Low Profile Chassis and PT CAILChassiS 4o adi b CREE 1 21 Figure 1 16 DC Power Cables for the Low Profile Computer 1 22 Figure 1 17 DC Power Distribution for the Low Profile Computer 1 2
29. 5 pin monitor port Built In Audio Controller The built in audio controller is a single chip that connects to the ISA bus The audio controller has analog jacks for line in and microphone input The single line out output jack provides stereo output for a line level input to an external amplifier or drives stereo headphones See Technical Specifications found later in this chapter for audio jack input and output specifications Built In Ethernet NIC Support The Dell OptiPlex GXa systems have an integrated 10 100 Mbps 3Com PCI 3C905 Ethernet NIC subsystem The subsystem supports both the IOBASE T and 100BASE T standards The NIC subsystem connects to the Ethernet net work through a single RJ45 connector on the back of the computer The RJ45 connector and the NIC interface circuitry are mounted on the system board The NIC connector on the computer s back panel has the following indicators A yellow activity indicator flashes when the system is transmitting or receiving network data A high volume of network traffic may make this indicator appear to be in a steady on state Agreen link integrity indicator lights up when there is a good connection between the network and the NIC When the green indicator is off the sys tem is not detecting a physical connection to the network Dell OptiPlex GXa Systems Service Manual Network Cable Requirements The computer s NIC connector RJ45 is designed for attaching to an u
30. Dell OptiPlex GXa Systems DLL Information in this document is subject to change without notice 1996 1997 Dell Computer Corporation All rights reserved Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden Trademarks used in this text Dell the DELL logo and OptiPlex are registered trademarks of Dell Computer Corporation Intel and Pentium are registered trademarks and MMX is a trademark of Intel Corporation Microsoft Windows and MS DOS are registered trademarks of Microsoft Corporation IBM is a registered trademark of International Business Machines Corporation 3Com is a registered trademark of 3Com Corporation Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own August 1997 P N 51555 Contents Chapter 1 System OVervieW oooooooooooooooononoo 1 1 Overview of Chassis Configurations 0 0 00 cee eee eee eee 1 1 Chassis Ditlerencess 4 ove tex Dexia ew erp ey ent Sex ee 1 2 Chassis Similarities d bh bca ee jie btaden Pa ea 1 2 standard Pedbulres us See ead ated aoe ep dE ea Seda EE 1 2 Pentium II Microprocessor vias ii es ada ev yew AER EY EN 1 2 Secondary L2 Caches cyanea v ite tas f B Rae ON a AE 1 3 Main Memory pito Sede eee epee es
31. Hz WARNING The voltage select switch located on the back of the power supply assembly must be set to the correct operating voltage 115 V or 230 V before you plug the power cable into an AC outlet The system power supply provides the DC operating voltages and currents listed in Table 1 4 NOTE The power supply produces DC voltages only under its loaded condi tion Therefore when you measure these voltages the DC power connectors must be connected to their corresponding power input connectors on the system board or drives 1 18 Dell OptiPlex GXa Systems Service Manual Table 1 4 DC Voltage Ranges Voltage Range Maximum Output Current 3 3 VDC 5 VDC 12 VDC 12 VDC 5 VDC 5 VFP 3 15 to 3 45 VDC 4 75 to 5 25 VDC 11 40 to 12 60 VDC 10 80 to 13 20 VDC 4 50 to 5 50 VDC 4 75 to 5 25 VDC 12 0 A low profile computers 14 0 A midsize and mini tower computers 18 0 A low profile computers 22 0 A midsize and mini tower computers 3 0 A low profile computers 6 0 A midsize and mini tower computers 0 3 A low profile computers 0 3 A midsize and mini tower computers 0 3 A low profile computers 0 3 A midsize and mini tower computers 10 mA 1 The combined load on the 5 VDC and 3 3 VDC outputs shall not exceed 105 W on the low profile computers or 140 W on the midsize mini tower computers Withstands surges of up to 11 0 A t
32. I bridge Option 2 has two ISA expansion card connectors 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 8 System Overview 1 9 connector connector HLED connector connector PCI3 connector PCI2 connector s eo connector Figure 1 7 Riser Board for the Midsize Computer Option 1 PCI4 connect ISA2 connector PCI5 connector PCI 1 CI3 Pisa connector HLED connector PCI2 connector Figure 1 8 Riser Board for the Midsize Computer Option 2 Mini Tower Computer s Expansion Card Slots The mini tower computers have seven expansion card slots The riser board has four ISA expansion card connectors and five PCI expansion card connectors 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 9 The riser board is active incorporating PCI to PCI bridging 1 10 Dell OptiPlex GXa Systems Service Manual ISA4 connector ISA3 connector PCI5 connector PCIA ISA2 connector connector a bob Isat connector connector PCI2 gt HLED connector connector PCI1 connector Figure 1 9 Riser Board for the Mini Tower Computer Upgrade Options The system board has various accommodations for system upgrades including Micropro
33. Pea be RUE RUE IE 1 3 Upgradable BIOS in Flash Memory 0 0 2 cece eee 1 3 BEIDE SuBSysteliiae A rra an S LA iU Misa NES 1 3 SMART Technology vete coo reta ita ER DRE RERRIAGGG RES iS 1 3 Built In Diskette Tape Drive Subsystem 040 1 3 Built In SVGA Subsystem pace eser e e haw e Ri hee da DE WR 1 4 Built In Audio Controller 22s cee od pex eS IY RE xk 1 4 Built In Ethernet NIC Support 0 0 0 0 eee eee eee eee 1 4 Network Cable Requirements vow dau ev owes ba E 1 5 EU SECO O POMS A x3 aia a as eA sabe i ia 1d 1 5 Universal Power Supply 0 0 0 0 cece eee eee eee 1 5 Location of Major Components 0 0 0 eee eee eee 1 6 Advanced Expansion Features 3 4 4 5044 44 000 444s 8904 hoes Y O4 Y 1 8 Low Profile Computer s Expansion Card Slots usus 1 9 Midsize Computer s Expansion Card Slots oooo oooooooo o 1 9 Mini Tower Computer s Expansion Card Slots 1 10 Uperade pun se hie seh Be oa A ore LO see E 1 11 Microprocessor L2 Cache Upgrades 0 00 e eee eee eee 1 11 Main Memory Expansion ia eet o AEN RES RE res 1 11 Video Memory Upgrade Option 0 0 00 cece eee eee 1 12 vi Computer Service Information 00 cece eee eee ee eee 1 12 Online Documentation usse Sex bea ea Dewees UD 1 12 System DIASNOSCS esae e o A Ma e At E 1 12 System Board Service Data iis cctv ed sou EAN A AEA ER B
34. S flash ROM 1 3 block diagram low profile computer 1 23 midsize computer 1 25 mini tower computer 1 26 boot routine for troubleshooting 2 3 bracket hard disk drive removal midsize computer 5 12 mini tower computer 6 14 C cabling verification 2 2 CD ROM drive removal low profile computer 4 10 midsize computer 5 11 mini tower computer 6 12 chassis configurations 1 1 similarities and differences 1 2 computer block diagram low profile computer 1 23 block diagram midsize computer 1 25 block diagram mini tower computer 1 26 controls and indicators 1 6 cover removal low profile computer 4 4 cover removal midsize computer 5 5 cover removal mini tower computer 6 4 diagnostics 1 12 DMA channel assignments 1 16 expansion features 1 8 front panel views 1 6 internal views 1 7 1 8 interrupt assignments 1 15 jumper information 1 14 Index 1 computer continued orientation information 1 17 technical specifications 1 27 upgrade options 1 11 connectors on back of low profile computer 1 7 on back of midsize computer 1 7 on back of mini tower computer 1 8 control panel removal low profile computer 4 7 midsize computer 5 8 mini tower computer 6 9 controllers audio 1 4 EIDE 1 3 Ethernet 1 4 NIC 1 4 video 1 4 controls and indicators diskette drive access indicator 1 6 front panel views 1 6 hard disk drive access indicator 1 6 NIC link integri
35. al standoffs as shown in Figure 5 22 5 Locate and press inward on the SEC cartridge release latches located directly on top of the SEC cartridge adjacent to the heat sink assembly until the latches click 6 Lift the SEC cartridge heat sink assembly out of its guide bracket assembly connector on the system board NOTE When installing the SEC cartridge heat sink assembly carefully orient the assembly and press firmly with up to 25 pounds of force to mate the SEC cartridge with its connector Then slide the heat sink release latches outward to lock the assembly onto the metal standoffs System Battery bro al Ys battery BATTERY socket Figure 5 23 System Battery Installation Removing and Replacing Parts on the Midsize Chassis 5 23 To remove the system battery follow these steps 1 If possible boot the system and enter the System Setup program Then record important system configuration information see Appendix A System Setup Program for details 2 Turn off power to all peripherals and disconnect the AC power cable from its AC 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 see Figure 5 18 CAUTION If you pry out the battery with a blunt object be careful not to touch the system board with the object Ensure that the object is inserted between the battery and the socke
36. arefully prying it out of its socket with your fingers or with a blunt nonconducting object such as a plastic screwdriver WARNING There is a danger of the new battery exploding if it is in correctly installed When you replace the system battery orient the new battery with the facing up see Figure 6 25 Replace the battery only with the same or equivalent type recommended by the manufacturer Discard used batteries according to the manufacturer s instructions 6 Insert the battery into the socket with the positive side labeled fac ing upwards into its socket and snap it into place 7 Replace the expansion card cage replace the computer cover re connect all cabling and reboot the system 8 Enter the System Setup program and configure the system using the information from the printouts you made earlier 9 Turn off the computer wait 10 or more minutes and reenter the System Setup program to ensure that the date and time are still correct indicat ing that the system battery is functioning correctly 6 26 Dell OptiPlex GXa Systems Service Manual Appendix A System Setup Program This 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 Press lt Ctrl gt lt Alt gt lt Enter gt immediately when prompted
37. atches 2 SEC cartridge securing clips 2 guide bracket assembly Figure 4 19 SEC Cartridge Heat Sink Removal 4 20 Dell OptiPlex GXa Systems Service Manual To remove the SEC cartridge heat sink assembly follow these steps 1 Remove the system power supply WARNING The SEC cartridge heat sink assembly can get extremely hot during system operations Be sure that the assembly has had suffi cient time to cool before touching it 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 serial port 2 connector and the video connector see Figure 4 15 4 Release the two securing clips near the base of the heat sink from the metal standoffs as shown in Figure 4 19 5 Locate and press inward on the SEC cartridge release latches located directly on top of the SEC cartridge adjacent to the heat sink assembly until the latches click 6 Lift the SEC cartridge heat sink assembly out of its guide bracket assembly connector on the system board NOTE When installing the SEC cartridge heat sink assembly carefully orient the assembly and press firmly with up to 25 pounds of force to mate the SEC cartridge with its connector Then slide the heat sink release latches outward to lock the assembly onto the metal standoffs System Battery battery BATTERY socket Figure 4 20 System Batt
38. ating 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 See your Windows 95 documen tation for instructions on using the Device Manager to manage resources and resolve conflicts 1 8 Dell OptiPlex GXa Systems Service Manual Low Profile Computer s Expansion Card Slots The low profile computers have three expansion card slots The riser board has two ISA expansion card connectors and two PCI expansion card connectors One PCI expansion card connector and one ISA expansion card connector share a single expansion card slot resulting in a total of three expansion card slots see Figure 1 6 The low profile computers have a passive riser board with no PCI to PCI bridge YAA AAA E ISA2 connector HLED sat connector connector J g PCI2 connector AAA lo connector Figure 1 6 Riser Board for the Low Profile Computer Midsize Computer s Expansion Card Slots The midsize computers have five expansion card slots The riser board is offered in two options Option 1 is a passive riser board with no PCI to PCI bridge Option 1 has three ISA expansion card connectors and three PCI expansion card connectors One PCI expansion card connector and one ISA expansion card connector share a single expansion card slot resulting in a total of five expansion card slots see Figure 1 7 Option 2 is an active riser board with a PCI to PC
39. ation about the com puter Unless otherwise specified the information applies to all chassis configurations Online Documentation Dell computers are shipped with an online System User s Guide within the Dell Accessories program folder that provides additional installation and configura tion information and Dell contact information System Diagnostics Supplied with your system is a system diagnostics program containing tests that aid in troubleshooting all major components of the three Dell OptiPlex GXa chassis configurations This diagnostics diskette should be copied for normal use save the original diskette in case the copy becomes corrupted See Run ning the System Diagnostics in Chapter 2 for additional information System Board Service Data The following subsections provides service related information about the sys tem board and components The same system board is used in the low profile midsize and mini tower computers 1 12 Dell OptiPlex GXa Systems Service Manual microphone jack MIC line out jack LINE OUT NIC connector ENET a video memory upgrade socket VIDEO_UPGRADE CD ROM audio interface connector CD_IN riser board connector RISER secondary EIDE interface video connector line in jack MONITOR LINE IN serial port 2 connector USB connectors _ keyboard mouse SERIAL2 USB connectors stacked KYBD MOUSE A ae parallel serial port 1 Hs conne
40. below 914 6 m 3000 ft Above 914 6 m 3000 ft the maximum operating temperature is reduced System Overview 1 31 Table 1 5 Technical Specifications continued Environmental continued Maximum vibration Operating Storage bu a Maximum shock Operating Storage ess cM ES Altitude Operating Storage dice Lb du RE 0 25 G at 3 to 200 Hz at 1 octave min 0 5 G at 3 to 200 Hz at 1 octave min left side for low profile and midsize com puters operating in a vertical orientation and bottom half sine pulse with a change in velocity of 20 inches sec 50 8 cm sec 27 G faired square wave with a velocity change of 200 inches sec 508 cm sec 16 to 3048 m 50 to 10 000 ft 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 fi Above 914 6 m 3000 ft the maximum operating temperature is reduced 1 32 Dell OptiPlex GXa Systems Service Manual Basic Troubleshooting This chapter provides basic troubleshooting procedures applicable to all sys tems of the Dell OptiPlex GXa family A brief explanation of how to load and start the diskette based diagnostics 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 manual Chapter 3 Beep Codes and Error Messages also contains information to assist you in
41. board System Password Not Enabled related error messages are reported Password Status Unlocked S B Boot Sequence Diskette First ee SCS ere Setup Password Not Enabled Auto Power On Disabled 00 00 Power Management Disabled Integrated Devices Sound On NIC On Mouse On Serial Port 1 Auto Serial Port 2 Auto Pentium II Processor 233 MHz Parallel Port 378h Level 2 Cache 512 KB Integrated Parallel Mode AT System Memory 16 MB SDRAM IDE Hard Disk Auto Video Memory 2 MB SGRAM Service Tag XXXXX Asset Tag XXXXX Diskette Auto Speaker On Tab Shift Tab change fields change values Alt P next Esc exit Alt B reboot Figure A 1 System Setup Screens A 2 Dell OptiPlex GXa Systems Service Manual Table A 1 System Setup Categories Category Function 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 Cat Diskette Drive B egory options always match physical locations of drives in computer Tape drives are not reflected in these categories Drive A Location Identifies which diskette drive is used as the boot drive Drives Primary Secondary Identifies drives attached to the IDE1 and IDE2 connectors on system board Each EIDE connector supports two EIDE drives Drive 0 and Drive 1 For EIDE hard disk drives the system
42. cessor upgrade e Main memory expansion e Video memory expansion These upgrades are summarized in the following subsections and installation procedures are provided for the various chassis configurations in Chapters 4 5 and 6 Microprocessor L2 Cache Upgrades On the Dell OptiPlex GXa systems the microprocessor and secondary L2 cache memory are implemented in an SEC cartridge heat sink assembly Upgrade to a higher performance microprocessor is accomplished by snapping out the old assembly and installing an upgrade assembly as higher performance microprocessors become available Main Memory Expansion The three DIMM sockets on the system board can accommodate combinations of 16 32 64 and 128 MB DIMMs up to a total memory capacity of 324 MB Main memory can have either 72 bit parity ECC DIMMs or 64 bit nonparity DIMMs System Overview 1 11 Video Memory Upgrade Option You can also upgrade video memory from 2 to 4 MB by installing an optional video memory upgrade module into the video memory upgrade socket on the system board Adding video memory increases the system s video performance and provides additional modes for high resolution expanded color applications NOTE See the online System User s Guide or Chapter 6 Installing System Board Options in the Reference and Installation Guide for additional upgrade information Computer Service Information The following subsections provide service related inform
43. ch diskette drive SS N Nee hard disk drive bracket NS gt gt EIDE cable primary EIDE connector IDE1 DSKT connector secondary EIDE connector IDE2 Figure 5 7 Drive Hardware Removing and Replacing Parts on the Midsize Chassis 5 9 Externally Accessible Drive Assemblies The following subsections contain removal replacement procedures for drives that are installed in the externally accessible drive bays 3 5 Inch Diskette Drive Assembly bracket mounting screw 9 drive mounting screws 2 hooks 2 Figure 5 8 3 5 Inch Diskette Drive Removal 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 4 Remove the two drive mounting screws from the left side of the drive and remove the drive from the bracket When you replace the 3 5 inch diskette drive be sure 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 5 10 Dell OptiPlex GXa Systems Service Manual 5 25 Inch Drive Assembly retaining tabs 2 Figure 5 9 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 Dis
44. connect the DC power cable and the interface cable from the back of the drive 2 Pressin on the two retaining tabs one on each side of the drive and slide the drive assembly forward to remove it 3 Remove the four screws attaching the 5 25 inch drive to the mounting plate and lift the drive out of the mounting plate see Figure 5 10 align the front of the drive flush with the tab at the front of the 5 25 inch drive mounting plate screws 4 Figure 5 10 5 25 Inch Drive Removal When you replace the 5 25 inch drive align the front of the drive flush with the tab 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 Removing and Replacing Parts on the Midsize Chassis 5 11 Hard Disk Drive Bracket lower back tab hard disk drive bracket Figure 5 11 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 2 Remove the screw that secures the hard disk drive bracket to the front of the chassis 3 Grasp the handle on the front of the bracket and rotate the front of the bracket up until the hooks are free from the chassis 4 Lift the hard disk drive bracket out of the computer When you reinstall the hard disk drive bracket place the l
45. ctors stacked BUE PARALLEL SERIAL1 E microprocessor fan connector FAN SEC cartridge SLOT1 DIMM sockets 3 DIMM A DIMM C main power input connector POWER 1 3 3 V power input connector POWER 2 connector IDE2 i system board jumpers j primary EIDE interface connector IDE1 battery socket BATTERY diskette tape drive control panel interface connector connector PANEL DSKT front of computer Figure 1 10 System Board Components System Overview 1 13 System Board Jumpers X RSVD2 300MHZ 266MHZ 233MHZ BIOS PSWD Figure 1 11 System Board Jumpers 1 14 Dell OptiPlex GXa Systems Service Manual Table 1 1 System Board Jumper Descriptions Jumper Description Settings RSVD2 Reserved Jumper not installed default 300MHZ Microprocessor Install jumper if the microprocessor s speed internal speed is 300 MHz otherwise the jumper should not be installed 266MHZ Microprocessor Install jumper if the microprocessor s speed internal speed is 266 MHz otherwise the jumper should not be installed 233MHZ Microprocessor Install jumper if the microprocessor s speed internal speed is 233 MHz otherwise the jumper should not be installed BIOS Reserved Do not install jumper PSWD Password Install to enable the password feature enable or default disable One set of speed jumpers must have a jumper plug insta
46. d disk drive Shutdown fail ure System board chip faulty Defective system board Time of day clock stopped Backup battery low Defective battery or faulty chip defective sys tem board Time of day not set Time or date setting in System Setup program incorrect or system bat tery bad Incorrect Time or Date settings or defective sys tem battery Timer chip counter 2 failed Timer circuit on system board malfunctioning Defective system board Unexpected interrupt in protected mode Keyboard mouse con troller malfunctioning or one or more DIMMs improperly seated Improperly seated DIMMs or faulty key board mouse controller chip defective system board Write fault Write fault on selected drive MS DOS cannot write to diskette or hard disk drive Faulty diskette or hard disk drive Dell OptiPlex GXa Systems Service Manual Remo ving and Replacing Parts on the Low Profile Chassis This chapter provides procedures for removing the components assemblies and subassemblies in the Dell OptiPlex GXa low profile computer If you are servicing a Dell OptiPlex GXa midsize or mini tower computer use Chapter 5 Removing and Replacing Parts on the Midsize Chassis or Chapter 6 Removing and Replacing Parts on the Mini Tower Chassis Unless otherwise noted each procedure assumes the following e You have performed the steps in Precau
47. deo monitor see the documentation for the monitor Inspect all external monitor controls for any obvious damage or improper settings For proper settings of the video monitor controls see the documentation for the monitor Inspect the keyboard to ensure that no keys are sticking If one or more keys are sticking it may be necessary to replace the keyboard Dell OptiPlex GXa Systems Service Manual 8 Inspect the exterior of the computer including all controls and indica tors and all user accessible data storage devices for any signs of physical damage Does the inspection reveal any problems Yes Refer to the parts removal and replacement procedure in Chapters 4 5 or 6 as appropriate for your chassis type No Proceed to the next section Observing the Boot Routine Observing the Boot Routine After you have performed an external visual inspection as described in the pre vious section you should boot the system and while the boot routine is running observe the system for any indications of problems NOTE Most of the steps in this procedure require observation of system func tions and indications some of which can occur simultaneously It may be necessary to reboot the system several times in order to complete all of these steps To observe problem indications during the boot routine follow these steps 1 Insert the diagnostics diskette into drive A Turn on all peripherals and the computer If the co
48. e system board 3 VDC power management logic RTC NVRAM Hal 3 POWER RISER POWER2 P2 PS P4 P5 P6 main memory sockets DIMM A b DIMM B b DIMM C b MICROPROCESSOR 12 VDC processor core regulator 3 3 VDC core VCC 2 1 to 3 5 VDC 5 VDC 5 VDC 5 VDC 5 VDC 5 VDC 12 VDC 12 VDC 12 VDC 12 VDC 12 VDC PANEL USB KYBD MOUSE PCI1 through PCI5 ISA1 through ISA4 Figure 1 20 DC Power Distribution for the Mini Tower Computer 1 26 Dell OptiPlex GXa Systems Service Manual Technical Specifications Table 1 5 Technical Specifications Microprocessor Microprocessor type Intel Pentium II microprocessor with MMX technology Microprocessor speed 233 266 or 300 MHz External system clock 66 MHz Internal cache 16 KB data cache and 16 KB instruction cache Math coprocessor internal to the microprocessor System Information System chip set Intel 440LX chip set Data bus width 64 bits Address bus width 32 bits DMA channels seven Interrupt levels 15 Flash EPROM BIOS 2Mb Expansion Bus Bus types ni Hes PCI and ISA PCI bus complies with PCI Specification 2
49. e with the front of the cover facing you 2 From the front of the cover use your thumbs to push inward on the insert until it slides off the two posts To replace a front panel insert position the front panel insert then press the ring tabs over the posts If necessary use a 1 4 inch nutdriver to help push on the ring tabs Dell OptiPlex GXa Systems Service Manual Control Panel AA chassis Tc Q Q M A o X control panel cable control panel E mounting tab Figure 4 5 Control Panel Removal mounting screw gt NE To remove the control panel follow these steps 1 Disconnect the control panel cable from the PANEL connector on the system board see Figure 4 15 2 From the inside of the chassis remove the mounting screw holding the control panel to the chassis 3 Remove the control panel from the chassis When you reinstall the control panel be sure to put the right side of the control panel behind the mounting tab Removing and Replacing Parts on the Low Profile Chassis 4 7 4 8 Dri ves Figure 4 6 shows an example of drive hardware that can be installed in the com puter Refer to this figure when you perform any of the procedures in the following subsections diskette tape drive interface cable 35 inch diskette drive 5 25 inch drive DC power cable bay and bracket power supply hard disk drive EIDE cable primary EIDE connector IDE1 DSKT conn
50. ector secondary EIDE connector IDE2 Figure 4 6 Drive Hardware Dell OptiPlex GXa Systems Service Manual 3 5 Inch Diskette Drive Assembly drive mounting screws 2 3 5 inch diskette drive assembly 1 latches 2 3 AN A a WE Figure 4 7 3 5 Inch Diskette Drive Removal front of computer hooks 2 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 Rotate the left side of the assembly up and lift the assembly out of the chassis 3 Remove the two drive mounting screws from the left side of the drive and remove the drive from the bracket When you replace the 3 5 inch diskette drive be sure the mounting holes on the right side of the drive engage the two hooks on the bracket Removing and Replacing Parts on the Low Profile Chassis 4 9 5 25 Inch Drive Assembly front of computer drive mounting screws 4 Figure 4 8 5 25 Inch Drive Assembly Removal To remove a 5 25 inch drive assembly follow these steps 1 Remove the 3 5 inch diskette drive assembly 2 Disconnect the DC power cable and the interface cable from the back of the 5 25 inch drive 3 Lift the 5 25 inch drive assembly straight up and out of the chassis 4 Lay the 5 25 inch drive assembly upside down then re
51. ector POWER 2 interface connector IDE2 battery socket BATTERY f diskette tape drive control panel system board jumpers primary EIDE interface connector connector PANEL interface connector DSKT IDE1 front of computer Figure 5 18 System Board Components Removing and Replacing Parts on the Midsize Chassis 5 19 DIMMs 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 see Figure 5 18 3 To remove a DIMM push outward on the DIMM socket s securing clips until the DIMM is released from its socket 4 Lift the DIMM away from the socket securing clips Figure 5 19 DIMM Removal 5 Reinstall the replacement DIMM by pressing the DIMM fully into the socket while closing the securing clips to lock the DIMM into the socket securing clips Figure 5 20 DIMM Installation 6 Replace all assemblies and cables previously removed Video Memory You can upgrade video memory from 2 to 4 MB by installing a video memory upgrade module into 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 5 20 Dell OptiPlex GXa Systems Service Manual To install the video memory upgrade follow these steps 1 Remove the expansion card cage CAUTION To avoid possible damage to
52. ee b E EOD BET 4 15 System Board Reimoyal cedere Ebr eee Re 4 16 System Board Components 000 eee eee 4 17 DIMM Removal 1 exse yw ritro taa e Y kx 4 18 DIMM Tnstallatiotie ex exa XI OVES EX RR SE 4 18 Installing a Video Memory Upgrade Module 4 19 SEC Cartridge Heat Sink Removal 4 20 System Battery Installation oooooooooooo o o 4 21 Internal View of the Midsize Computer 5 3 Floor Stand Removal 0 0 c ee eee eee nee 5 4 Computer Cover Removal 0 0 0 0 0c eee eee 5 5 Eject Power and Reset Button Removal 5 6 Front Panel Insert Removal 0 0 20 20 ee eee 5 7 Control Panel Removal 0 c ee eee ee eee 5 8 Drive Hard Ware codicia is 5 9 3 5 Inch Diskette Drive Removal 0 5 10 5 25 Inch Drive Assembly Removal 5 11 5 25 Inch Drive Removal 5 429 etzetu Moves Cees 5 11 Hard Disk Drive Bracket Removal 5 12 Hard Disk Drive Removal 0 0 eee eee 5 13 System Power Supply Removal 04 5 14 Expansion Card Cage Removal momo 5 15 Expansion Card Removal 0 00000 e eee 5 16 Riser Board Removal 0 0 00 e eee eee eee 5 17 System Board Removal lelues esu 5 18 System Board Components 0 000 o 5 19 DIMM Removal 5x9 ERR E EROGO RESO 5 20 Figure 5 20
53. egrity indicator on NIC connector green LED Activity indicator on NIC connector yellow LED Power Power supply wattage Low profile computers 145 W Midsize computers 200 W Mini tower computers 230 W 1 30 Dell OptiPlex GXa Systems Service Manual Table 1 5 Technical Specifications continued Power continued Power supply heat dissipation Low profile computers 808 BTU nominal Midsize computers 913 BTU nominal Mini tower computers 913 BTU nominal Power supply voltage 90 to 135 V at 60 Hz 180 to 265 V at 50 Hz Backup battery 3 V CR2032 coin cell Physical Low profile computers Heights ted ee tlt ees 10 9 cm 4 3 inches Widths 2 Ase Gee BSS ok 40 89 cm 16 1 inches Depas 43 69 cm 17 2 inches Weight minimum 10 89 kg 24 Ib Midsize computers Height sil 16 5 cm 6 5 inches Width 1 esi sagan bs 41 9 cm 16 5 inches Depths ove ehe 44 5 cm 17 5 inches Weight minimum 12 7 kg 28 Ib Mini tower computers Herria 44 4 cm 17 5 inches Width 20 6 cm 8 1 inches Depth cocinas 43 7 cm 17 2 inches Weight minimum 14 9 kg 33 Ib Environmental Temperature Operating 10 to 35 C 50 to 95 F Storage 2 sake eee es 40 to 65 C 40 to 149 F Relative humidity 8 to 80 noncondensing The maximum operating temperature of 35 C 95 F is for altitudes
54. elling you which DIMM has failed If no errors are found in main memory the diagnostics loads and the Diagnos tics Menu appears This menu lets you choose the following options or exit to the MS DOS prompt e Run Quick Tests Runs selected tests from all test groups to quickly locate a failure or to indicate where further testing is needed to isolate a failure e Run All Tests Runs all tests for a thorough test of the system e Run Specific Tests Tests a particular area or subsystem Getting Help If you are unable to determine the source of your problem call Dell for techni cal assistance For instructions see Getting Help in the online System User s Guide 2 6 Dell OptiPlex GXa Systems Service Manual Beep Codes and Error Messages This chapter describes the beep codes and error messages that are common to all members of the Dell OptiPlex GXa family of computers These error mes sages 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 If a faulty system does not emit beep codes or display system error messages to indicate a failure you should use the system diagnostics to run the appropriate tests to help isolate the source of the problem See Running the System Diag nostics in Chapter 2 Post Beep Codes If the m
55. emoval o oooomoooo o 6 17 Expansion Card Removal oo oococoococoocoooo o 6 18 Riser Board Removal Via ci 4 oy es Rex v RS 6 19 System Board Removal oi iso a diered nau Ohare 6 20 System Board Components 0c eee eee 6 21 DIMM Removal darias Ebr ES 6 22 DIMM Installation cs v9 HE p RR nr RE Rar 6 22 Installing a Video Memory Upgrade Module 6 23 SEC Cartridge Heat Sink Removal 6 24 System Battery Installation oooooooooooo 6 25 System Setup Screens sous ek xA as Rew ed A 2 Xi Xii Tables Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 1 5 Table 3 1 Table 3 2 Table A 1 System Board Jumper Descriptions 1 15 Interrupt Assignments 0 20 22 eee eee 1 15 DREQ Line Assignments 42 20 24 vh LA SA ELE 1 16 DC Voltage Ranges 2l Rb ER RES RE S 1 19 Technical Specifications ii oC YT 1 27 POST Beep Codes Saa bude Fax Pa RE DRE ET 3 2 System Error Messages iilos se D repr RR 3 4 System Setup Caltecones is ove oa Ex ers A 3 xiij Xiv Read This First A prerequisite for using this manual to service Dell computer systems is a basic knowledge of IBM2 compatible PCs and prior training in IBM compatible PC troubleshooting techniques In addition to information provided in this manual and the online System User s Guide Dell provides the Diagnostics and Troubleshooting Guide for troubleshooting procedur
56. eripherals and disconnect the AC power cable from its AC 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 4 Lift the bottom of the cover allowing it to pivot up toward you 5 Disengage the tabs that secure the cover to the top of the chassis and lift the cover away Before you reinstall the cover fold all cables out of the way so that they do not interfere with the cover or with the proper airflow inside the computer 6 4 Dell OptiPlex GXa Systems Service Manual Front Bezel tab release retaining hooks 2 Figure 6 3 Front Bezel Removal To remove the front bezel follow these steps 1 Press the tab release marked with the icon 2 Tilt the bezel away from the chassis 3 Disengage the two retaining hooks at the bottom of the bezel and pull the bezel away from the chassis Removing and Replacing Parts on the Mini Tower Chassis 6 5 Eject Power and Reset Buttons front bezel y eject buic Ths power button Figure 6 4 Eject Power and Reset Button Removal To remove the eject power and reset buttons follow these steps 1 Lay the front bezel on a flat work surface with the back of the bezel facing up 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button or the reset button
57. ery Installation Removing and Replacing Parts on the Low Profile Chassis 4 21 To remove the system battery follow these steps 1 If possible boot the system and enter the System Setup program Then record important system configuration information see Appendix A System Setup Program for details 2 Turn off power to all peripherals and disconnect the AC power cable from its AC 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 see Figure 4 15 CAUTION If you pry out the battery with a blunt object be careful not to touch the system board with the object Ensure that the object is inserted between the battery and the socket before attempting to pry out the battery Otherwise you may damage the system board by prying off the socket or by breaking traces on the system board 5 Remove the battery by carefully prying it out of its socket with your fin gers or with a blunt nonconducting object such as a plastic screwdriver WARNING There is a danger of the new battery exploding if it is in correctly installed When you replace the system battery orient the new battery with the facing up see Figure 4 20 Replace the battery only with the same or equivalent type recommended by the manufac turer Discard used batteries according to the manufacturer s instructions
58. es and instructions on using the Dell diagnostics to test the computer system Warnings Cautions and Notes Throughout this manual there may be blocks of text printed in bold type or in italic type These blocks are warnings cautions and notes and they are used as follows WARNING A WARNING indicates the potential for bodily harm and pro vides instructions for how to avoid the problem CAUTION A CAUTION indicates either potential damage to hardware or loss of data and provides instructions for how to avoid the problem NOTE A NOTE provides helpful information about using the computer system System Overview This manual contains field servicing information for the Dell OptiPlex GXa family of computers The Dell OptiPlex GXa systems are high speed 233 266 and 300 MHz upgradable desktop computers built around the high performance Intel Pentiume II microprocessors with MMX technology Chapters 1 through 3 and Appendix A contain information that applies to all models of the Dell OptiPlex GXa family Chapters 4 5 and 6 are chassis specific Overview of Chassis Configurations The Dell OptiPlex GXa systems are available in the following chassis configurations Low profile desktop e Midsize desktop e Mini tower Midsize Chassis Mini Tower Chassis Figure 1 1 Chassis Configurations System Overview 1 1 1 2 Chassis Differences The three chassis configuratio
59. f the fol lowing tools e Small flat blade screwdriver e Wide flat blade screwdriver e Fl and 2 Phillips screwdrivers e 4 inch nutdriver Tweezers or long nose pliers Also use a wrist grounding strap as explained in the next section Precaution ary Measures Removing and Replacing Parts on the Midsize Chassis 5 1 5 2 Precautionary Measures 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 WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the system per form the following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury Also 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 4 Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the back of the chassis If a wrist grounding strap is not available periodically touch an unpainted metal surface on the back of the computer to discharge any static char
60. ge from your body Avoid touching components and contacts on a card and avoid touching pins on a chip to prevent static electricity damage Dell OptiPlex GXa Systems Service Manual Inside the Computer Figure 5 1 shows an internal view of the midsize computer and identifies major components for orientation Refer to this illustration as needed when perform ing the component removal replacement procedures in this chapter 3 5 inch diskette drive external drive bays diskette tape drive interface cable hard disk drive bracket power supply hard disk drive system board interface cable expansion card cage expansion card slots 5 Figure 5 1 Internal View of the Midsize Computer Removing and Replacing Parts on the Midsize Chassis 5 3 Floor Stand floor stand screw Figure 5 2 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 3 Pull the floor stand away from the computer Disengage the three orientation nubs that position and help hold the floor stand to the computer 5 4 Dell OptiPlex GXa Systems Service Manual Computer Cover securing buttons 2 a d ES CM 33 3333 33333 3359393 p 3 33332 35 d d Figure 5 3 Computer Cover Removal To remove the computer cove
61. he four screws and tighten them in the order stamped on the bottom of the 5 25 inch drive mounting plate Removing and Replacing Parts on the Mini Tower Chassis 6 13 Hard Disk Drive Bracket drive cage slide rail chassis slot hinge tabs 3 sliding tab Figure 6 13 Hard Disk Drive Bracket Removal To remove the hard disk drive bracket follow these steps 1 Disconnect the DC power cable and the interface cable from the back of each hard disk drive installed in the hard disk drive bracket 2 Remove the screw that secures the hard disk drive bracket to the drive cage in the chassis 3 Grasp the bracket and rotate it outward from the chassis until the slid ing tab clears the slide rail on the drive cage 4 Lift the hard disk drive bracket up slightly to free the hinge tabs and remove it from the computer When you reinstall the hard disk drive bracket insert the bracket s hinge tabs into the chassis slots so that the tabs hook over the slots Then rotate the bracket toward the drive cage and fit the bracket s sliding tab on the drive cage slide rail 6 14 Dell OptiPlex GXa Systems Service Manual Hard Disk Drive drive mounting screws 4 for side mounted drive C2 Rr sliding tab I I hard disk drive I I hard disk drive bracket drive mounting screws 4 for bottom mounted drive 68 Figure 6 14 Hard Disk Drive Removal To remove a hard disk drive follow
62. he 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 4 Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the back of the chassis If a wrist grounding strap is not available periodically touch an unpainted metal surface on the back of the computer to discharge any static charge from your body Avoid touching components and contacts on a card and avoid touching pins on a chip to prevent static electricity damage Dell OptiPlex GXa Systems Service Manual Inside the Computer Figure 6 1 shows an internal view of the interior of the mini tower computer and identifies major components for orientation Refer to this illustration as needed when performing the component removal replacement procedures in this chapter power supply external drive bays hard disk drive bracket SH BI expansion card 4 cage riser board system board Figure 6 1 Internal View of the Mini Tower Computer Removing and Replacing Parts on the Mini Tower Chassis 6 3 Computer Cover release button Figure 6 2 Computer Cover Removal To remove the computer cover follow these steps 1 Turn off power to all p
63. hieqbioi eR eee gb h hee Reed is 4 Precautionary Measures 208 85 c SV eg s EVER USUAL RES a AUR Se 4 2 Inside the Computers cio ndr GU Ne RI AE Ga Lee EM RAS 4 3 Computer Covers ia vv DER NI EXE ERES Ea e Sone XEM 4 4 Eject Power and Reset Buttons usc ere EX Ow eS Sa eee 4 5 bronpPaneldnsersssu 5s se ou Lan oh etal sea td A als Pek ee 4 6 Control Panel 2i222iacekRelk h oist irade MER aden de dea 4 7 Drives ur hate dead e oue RA Bre YA Dee ies 4 8 3 5 Inch Diskette Drive Assembly 0 e ee ee eee 4 9 5 25 Inch Drive Assembly iooooooocoroorroorcrracr 4 10 Hard Disk Drive Assembly 4 e Rhe fees 4 11 System Power SUpply cive Sow gs 4s E Yow Mone Mow eee E 4 12 Expansion Cards ate a eta ee an ATL b e se fue 4 13 Expansion Card Cage 0 0 ce eee eee eee 4 13 Expansion Card cus aeta ar eo wag AO Wa pn Bape hed TERES 4 14 Riser Bodrdo 20 teo ess wpa e ed ee e po cda 4 15 System Board 4 ocio poke eua Rea ee a a ERN bene eke 4 16 System Board Components ccce eek ge xke tie seed 4 17 DINMINIS ein xr zone foni vr Kad Se CAPE M OR 4 18 Video Mem eiae utar ad c a a eed e tar 4 18 Mi CTOPIOCESS OF ince oes ed euer verae ie aede ne ie 4 20 SEC Cartridge Heat Sink Assembly oooooooooommormm 4 20 System Battery ouo oui e a aces Ue ch o epu iso Drs pU e e ale 4 21 Chapter 5 Removing and Replacing Parts on the Midsize Chassis i ovs snl rte RR a 5 1 Recommended Tools voir rita RE cie dada EESLIG
64. ia and communications environments The Pentium II microprocessor also uses a tech nique called Single Instruction Multiple Data SIMD which permits processing data elements in parallel for additional system performance enhancement 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 Dell OptiPlex GXa Systems Service Manual Secondary L2 Cache For additional performance the Dell OptiPlex GXa systems employ a second ary cache memory subsystem with a cache memory controller and 512 KB of pipeline burst SRAM cache memory The L2 cache SRAM is located in the SEC cartridge heat sink assembly on the system board Main Memory Main memory for the Dell OptiPlex GXa systems range from a minimum of 16 MB of memory to a maximum of 324 MB All main memory is implemented using high speed ECC and non ECC DIMMs One to three DIMMs ranging in memory capacity sizes from 16 to 128 MB may be used to provide a maximum memory capacity of 324 MB Upgradable BIOS in Flash Memory The system BIOS is implemented in flash ROM which allows for easy BIOS upgrades using diskette files or downloaded files from Dell s home page on the World Wide Web The BIOS also incorporates the POST diagnostics that test the system each time the syste
65. ibution for the Low Profile Computer main memory sockets DIMM_A DIMM_B DIMM_C b MICROPROCESSOR processor core regulator 43 3 VDC core VCC 2 1 to 3 5 VDC PCI1 PCI2 ISA1 ISA2 System Overview 1 23 Figure 1 18 DC Power Cables for the Midsize and Mini Tower Computers 1 24 Dell OptiPlex GXa Systems Service Manual PWRGOOD POWER1 P1 system board 3 VDC battery riser board power management RTC LT logic NVRAM LL RISER 5 VDC Pclt through PCI3 ISA1 through system ISA3 power supply internal P2 hard disk drive internal hard disk drive 3 5 inch diskette drive optional drive optional drive P3 P4 P5 P6 12 VDC main memory sockets DIMM_A b DIMM B b DIMM C b processor MICROPROCESSOR core regulator 43 3 VDC core VCC 42 1 to 3 5 VDC 5 VDC 5 VDC 12 VDC 12 VDC 12 VDC 12 VDC 12 VDC Figure 1 19 DC Power Distribution for the Midsize Computer System Overview 1 25 system power supply internal hard disk drive internal hard disk drive 3 5 inch diskette drive optional drive optional driv
66. icate that device requires service If the EIDE controller is disabled this line is available for other use Generated by device connected to secondary EIDE port to indicate that device requires service If the EIDE controller is disabled this line is available for other use NOTE The built in sound controller and built in NIC controller are assigned available IRQs automatically during system start up DMA Channel Assignments Table 1 3 DREQ Line Assignments DREQ Line Used By Available DREQO DREQI DREQ2 DREQ3 DREQ4 DREQS DREQ6 DREQ7 Available Available Generated by super I O controller to initiate DMA cycle for attached diskette drive Available Generated by bus controller chip to activate second DMA controller Available Available Available NOTE The built in sound controller built in NIC and built in video controllers are assigned available DMA channels automatically during system start up 1 16 Dell OptiPlex GXa Systems Service Manual Hard Disk Drive Service Information The following subsections provide service related information about hard disk drive options in the low profile midsize and mini tower computers NOTE Throughout this manual component location information references are made that assume the chassis orientations identified in Figure 1 12 right side front Low Profile Computer back bottom Mini Tower Computer right side f
67. ies in the Dell OptiPlex GXa mini tower computer If you are servicing a Dell OptiPlex GXa low profile or midsize computer use Chapter 4 Removing and Replacing Parts on the Low Profile Chassis or Chapter 5 Removing and Replacing Parts on the Midsize Chassis Unless otherwise noted each procedure assumes the following You have performed the steps in Precautionary Measures found later in this chapter You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided Recommended Tools Most of the procedures in this chapter require the use of one or more of the fol lowing tools e Small flat blade screwdriver e Wide flat blade screwdriver e Fl and 2 Phillips screwdrivers e j 4 inch nutdriver Tweezers or long nose pliers Removing and Replacing Parts on the Mini Tower Chassis 6 1 6 2 Precautionary Measures 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 WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the system per form the following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce t
68. ing 2 5 Eliminating Resource Conflicts Devices within the computer may require dedicated memory spaces interrupt levels or DMA channels all of which must be allocated during installation of the devices Because a device may be installed at a different time it is possible that the same resource is assigned to two or more devices Resource conflicts can result in disorderly or erratic system operation or failure of the system to operate at all If you suspect that resource conflicts might exist check the system and reassign the resources as necessary R unning the System Diagnostics The diskette based diagnostics included with the system contains tests that aid in troubleshooting all major components of the system 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 To start the diagnostics turn off the system insert a diagnostics diskette into drive A and then turn on the system Starting the diagnostics causes the Dell logo screen 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 If a main memory error is detected a mes sage appears on the screen t
69. ity 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 You may also have to reseat or replace an SEC cartridge heat sink assembly during normal maintenance SEC Cartridge Heat Sink Assembly SEC cartridge release latches 2 heat sink SEC cartridge heat sink clips 2 guide bracket assembly Q metal standoffs 2 p E Figure 6 24 SEC Cartridge Heat Sink Removal 6 24 Dell OptiPlex GXa Systems Service Manual To remove the SEC cartridge heat sink assembly follow these steps 1 Remove the system power supply WARNING The SEC cartridge heat sink assembly can get extremely hot during system operations Be sure that the assembly has had suffi cient time to cool before touching it 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 serial port 2 connector and the video connector see Figure 6 20 4 Release the two securing clips near the base of the heat sink from the metal standoffs as shown in Figure 6 24 5 Locate and press inward on the SEC cartridge release latches located directly on top of the SEC cartridge adjacent to the heat sink assembly un
70. lled otherwise the system defaults to 233 MHz Interrupt Assignments Table 1 2 Interrupt Assignments IRQ Line Used By Available IRQO Generated by system timer IRQI 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 Available for use by an expansion card IRQ4 Generated by super I O controller to indicate that the device con nected to the serial port COMI or COM3 requires service IRQ5 Available for use by an expansion card IRQ6 Generated by super I O controller to indicate that diskette or tape drive requires service IRQ7 Generated by super I O controller to indicate that device con nected to parallel port requires service NOTE The built in sound controller and built in NIC controller are assigned available IRQs automatically during system start up System Overview 1 15 Table 1 2 Interrupt Assignments continued IRQ Line Used By Available IRQ8 IRQ9 IRQ10 IRQ11 IRQ12 IRQ13 IRQ14 IRQ15 Generated by keyboard controller for each tick of RTC Available for use by an expansion card Available for use by an expansion card Available for use by an expansion card Generated by keyboard controller to indicate that mouse s output buffer is full Generated by math coprocessor to indicate coprocessor error Generated by device connected to primary EIDE port to ind
71. m s built in parallel port acts as an AT compatible unidirectional or PS 2 compatible bidirectional port A 4 Dell OptiPlex GXa Systems Service Manual Table A 1 System Setup Categories continued Category Function IDE Hard Disk Enables system s built in EIDE hard disk drive interface Diskette Enables system s built in diskette drive controller Speaker Enables on board speaker Microprocessor Displays type of microprocessor installed Level 2 Cache Displays size of level 2 cache memory installed Video Memory Displays amount of video memory on the sys tem board System Memory Displays entire amount of installed memory detected in system except for memory on EMS expansion cards Service Tag Displays system s five character service tag number Asset Tag Displays the asset tag number up to ten charac ters if one is assigned System Setup Program A 5 A 6 Dell OptiPlex GXa Systems Service Manual Index Numbers 3 5 inch diskette drive removal low profile computer 4 9 midsize computer 5 10 mini tower computer 6 12 5 25 inch drive assembly removal low profile computer 4 10 midsize computer 5 11 mini tower computer 6 12 A AC power receptacle 1 7 AC voltage selection switch 1 5 1 7 1 8 audio connectors 1 5 controller 1 4 B battery removal low profile computer 4 21 midsize computer 5 23 mini tower computer 6 25 beep codes 3 1 BIO
72. m from using available memory One or more DIMMs faulty or improperly seated Diskette drive O seek failure Diskette drive 1 seek failure Diskette tape drive con troller could not locate specific sector or track Faulty or improperly inserted diskette incorrect configuration settings in System Setup program loose diskette tape drive interface cable or loose power cable Diskette read failure Failure occurred while system attempted to read diskette Faulty diskette faulty or improperly connected diskette tape drive inter face cable or loose power cable Dell OptiPlex GXa Systems Service Manual Table 3 2 System Error Messages continued Message Definition Probable Causes Diskette sub system reset failed System could not suc cessfully issue reset command to diskette controller Faulty diskette tape drive controller defective sys tem board Diskette write protected Diskette write protect feature activated Diskette write protected Drive not ready Diskette missing from or improperly inserted in diskette drive Defective unformatted or improperly inserted diskette Gate A20 fail ure Gate A20 of the keyboard controller malfunctioned Faulty keyboard control ler defective system board General fail ure Operating system can not execute command Operating system cor rupted or not i
73. m is started EIDE Subsystem The EIDE subsystem implemented on the system board provides two Mode 4 DMA bus mastered EIDE interfaces each of which can support up to two EIDE devices for example CD ROM drive hard disk drive and so on The EIDE controller attaches to the high speed PCI local bus The primary EIDE interface IDE1 provides support for up to two high performance EIDE devices The computer s boot drive should be connected to the primary EIDE interface The secondary EIDE interface IDE2 also provides support for up to two high performance EIDE devices typically EIDE tape drives or CD ROM drives NOTE The externally accessible drive bays at the front of the computer are normally used for diskette drives CD ROM drives and or tape drives Hard disk drives should be installed in the internal hard disk drive positions described in Hard Disk Drive Service Information found later in this chapter SMART Technology As a standard feature Dell OptiPlex GXa systems are equipped with Self Monitoring Analysis Reporting Technology SMART which warns you at system start up if your hard disk drive has become unreliable This warning occurs only if you use hard disk drives with SMART technology Built In Diskette Tape Drive Subsystem The Dell OptiPlex GXa systems are equipped with an integrated diskette drive controller PC87307V UL that can support a maximum of two non EIDE dis kette and tape drives via a 34 pin
74. messages are very useful in troubleshooting the system Some of these messages require oper ator intervention to solve others indicate fatal errors that must be solved before the system will reboot Table 3 2 lists the system error messages that can occur and the probable cause for each message Beep Codes and Error Messages 3 3 Table 3 2 System Error Messages Message Definition Probable Causes Address mark not found BIOS found faulty disk sector or could not find particular disk sector Faulty diskette tape drive subsystem or hard disk drive subsystem defec tive system board Attachment failed to respond Diskette drive or hard disk drive controller cannot send data to associated drive Faulty interface cable or connector Bad command or file name Command entered does not exist or is not in pathname specified Bad command Bad error correction code ECC on disk read Controller has failed Diskette drive or hard disk drive controller detected uncorrectable read error Hard disk drive or associated controller defective Faulty diskette tape drive subsystem or hard disk drive subsystem defec tive system board Data error Computer received un recoverable data read error from diskette or hard disk drive Faulty diskette diskette drive or hard disk drive Decreasing available memory Read write failure during POST prevents syste
75. moval low profile computer 4 12 removal midsize computer 5 14 removal mini tower computer 6 16 System Setup program about A 1 categories A 3 key combination to enter A 1 screens A 2 system unit See computer T tape drives about 1 4 removal low profile computer 4 10 removal midsize computer 5 11 removal mini tower computer 6 12 technical specifications 1 27 tools recommended low profile computer 4 1 midsize computer 5 1 mini tower computer 6 1 Index 5 6 troubleshooting boot routine 2 3 external visual inspection 2 2 initial procedures 2 1 internal visual inspection 2 4 using beep codes 3 1 U upgrade options 1 11 Dell OptiPlex GXa Systems Service Manual V video memory about 1 12 adding to low profile computer 4 18 adding to midsize computer 5 20 adding to mini tower computer 6 22 controller 1 4 visual inspection external 2 2 internal 2 4 voltage selection switch AC 1 7 W warnings 4 2 5 2 6 2
76. move the four screws attaching the drive to the bracket When you replace the 5 25 inch drive place the front of the drive toward the front of the bracket then install the four screws but do not tighten them Align the screws with the score marks on the bracket and tighten the screws in the order stamped on the bottom of the bracket Check the alignment of the computer cover around the 5 25 inch drive bezel Adjust the drive forward or backward on the bracket to align it 4 10 Dell OptiPlex GXa Systems Service Manual Hard Disk Drive Assembly hard disk drive mounting screws 4 tabs 2 SS captive screw SS N So front of computer notches 2 Figure 4 9 Hard Disk Drive Assembly Removal 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 3 Pivot the hard disk drive assembly up then lift it out of the chassis 4 Remove the four hard disk drive mounting screws that attach the hard disk drive to the hard disk drive bracket When you reinstall the hard disk drive assembly be sure the tabs on the back of the mounting plate fully engage in the notches on the chassis before you rotate the assembly into place Removing and Replacing Parts on the Low Profile Chassis 4 11 4 12 System Power Supply
77. mputer is already on press the reset button or lt Ctrl gt lt Alt gt lt Del gt to reboot the system 2 Check the power supply fan Does the fan run normally Yes Proceed to step 3 No Troubleshoot the system power supply 3 Watch the Num Lock Caps Lock and Scroll Lock indicators on the upper right corner of the keyboard After all three indicators flash momentarily the Num Lock indicator should light up and remain on Do these indicators flash on and off within approximately ten seconds after the boot routine starts Yes Proceed to step 4 No Troubleshoot the system power supply If the troubleshooting procedure indicates that the system power supply is operational troubleshoot the system board Basic Troubleshooting 2 8 4 During the boot routine observe the system for any of the following e Diskette drive and hard disk drive access indicators These indicators light up in response to data being transferred to or from the drives If either of these indicators fails to light up during the boot routine trou bleshoot the diskette drive or hard disk drive subsystem as appropriate e System error messages These messages can indicate problems or pro vide status information If a system error message is displayed see Table 3 2 e Beep codes A beep code is a series of beeps that indicates an error con dition If the system emits a beep code see Table 3 1 5 Observe the monitor screen for the Diagnostics Menu
78. nch diskette drive 2 Press the retaining tab release button and pull the drive assembly for ward to remove it 3 Remove the drive mounting screw from the left side of the drive and remove the drive from the bracket see Figure 6 10 Removing and Replacing Parts on the Mini Tower Chassis 6 11 drive mounting screw hooks 2 Figure 6 10 3 5 Inch Diskette Drive Bracket 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 5 25 Inch Drive Assembly retaining tabs 2 Figure 6 11 5 25 Inch Drive Assembly Removal 6 12 Dell OptiPlex GXa Systems Service Manual 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 Pressin on the two retaining tabs one on each side of the drive and slide the drive assembly forward to remove it 3 Remove the four screws attaching the 5 25 inch drive to the mounting plate and lift the drive out of the mounting plate see Figure 6 12 align the front of the drive flush with the tab at the front of the 5 25 inch drive mounting plate RO screws 4 Figure 6 12 5 25 Inch Drive Removal When you replace the 5 25 inch drive align the front of the drive flush with the tab at the front of the mounting plate Insert t
79. nel Removal To remove the control panel follow these steps 1 2 Remove the hard disk drive bracket Disconnect the control panel cable from the PANEL connector on the system board see Figure 6 20 Remove the mounting screw holding the control panel to the chassis 4 Slide the control panel out of the hooks holding it to the chassis Note the routing of the control panel cable as you remove it from the chassis Removing and Replacing Parts on the Mini Tower Chassis 6 9 Dri ves Figure 6 8 shows an example of drive hardware that can be installed in the com puter Refer to this figure when you perform any of the procedures in the following subsections diskette tape drive 3 5 inch diskette drive interface cable Q hard disk drive bracket DC power cable DSKT connector ii primary EIDE connector IDE1 l secondary EIDE __ connector IDE2 2 8 EIDE cable p Figure 6 8 Drive Hardware Externally Accessible Drive Assemblies The following subsections contain removal replacement procedures for drives that are installed in the externally accessible drive bays 6 10 Dell OptiPlex GXa Systems Service Manual 3 5 Inch Diskette Drive Assembly retaining tab release button Figure 6 9 3 5 Inch Diskette 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 i
80. not hear a sharp click when installing the video memory upgrade module remove the module and repeat steps 2 and 3 4 Replace the expansion card cage 5 Replace the computer cover and reconnect the AC power cable to the AC outlet Press the power switch on the computer to reboot the system NOTE As the system boots it automatically detects the presence of the new video memory upgrade module and automatically changes the system con figuration information in the System Setup program 6 Enter the System Setup program and confirm that 4 MB is shown in the Video Memory category If the total memory is listed incorrectly repeat steps 1 through 6 to reseat the video memory upgrade module and ver ify that the computer acknowledges the module 7 Run the system diagnostics Video Test Group to test the new video memory upgrade module Removing and Replacing Parts on the Low Profile Chassis 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 You may also have to reseat or replace an SEC cartridge heat sink assembly during normal maintenance SEC Cartridge Heat Sink Assembly Y heat sink SEC cartridge release l
81. ns differ primarily in the following expansion features e Number of expansion slots available for PCI ISA expansion cards e Number of available internal drive bays for EIDE SCSI drives e Number of available external drive bays for diskette CD ROM or tape drives Physical size and power supply types the low profile system contains a smaller power supply than that used in the other two chassis configurations Due to the physical differences in the three chassis configurations separate parts removal and replacement chapters Chapters 4 through 6 are provided for each chassis type Chassis Similarities All three chassis configurations have the following similarities e Identical system board Identical operational characteristics same BIOS POST memory microprocessor external I O ports and so on e Identical diagnostics diagnostic beep codes and diagnostic screen error messages see Chapters through 3 and Appendix A Standard Features The features described in the following subsections are common to all chassis configurations Pentium Il Microprocessor All systems in the Dell OptiPlex GXa computer family incorporate the Pentium II microprocessor for improved operating speeds and overall performance Some of the major enhancement features of the Pentium II microprocessor include internal 16 KB data and instruction caches internal math coprocessor and the MMX instruction set for high performance in complex multimed
82. nshielded twisted pair UTP Ethernet cable The other end of the cable con nects to an RJ45 jack wall plate or to an RJ45 port on a UTP concentrator or hub depending on the network configuration Chapter 4 Using Integrated Devices in the Reference and Installation Guide provides instructions for connecting the computer to and configuring it for use on an Ethernet network Full Set of I O Ports For desktop connectivity the Dell OptiPlex GXa systems include the following ports 25 pin bidirectional parallel port with EPP ECP and demand mode DMA support e Two Universal Serial Bus USB ports e Two 9 pin serial ports Two PS 2 ports mouse and keyboard e One 15 pin monitor connector Three audio connectors microphone jack line in jack and line out jack e One RJA5 Ethernet NIC connector See Figures 1 3 through 1 5 for I O port identifiers for the various chassis configurations Universal Power Supply The Dell OptiPlex GXa systems are equipped with a switch selectable 115 230 VAC universal power supply that can operate from standard AC power outlets in the U S and all international countries The power supply used in the midsize and mini tower chassis configurations is a higher capacity power supply than that used in the low profile chassis configuration See additional power supply information in Technical Specifications found later in this chapter System Overview 1 5 Location of Major Compone
83. nstalled properly Hard disk controller failure Hard disk drive read failure Hard disk failure Hard disk drive failed to initialize Incorrect configuration settings in System Setup program improperly con nected hard disk drive cable faulty hard disk drive controller sub system defective system board or loose power cable Invalid con figuration information please run SETUP program System Setup program contains incorrect system configuration settings Incorrect configuration settings in System Setup program or faulty battery Keyboard clock line failure Keyboard fail ure System cannot commu nicate with keyboard Keyboard cable connec tor loose or improperly connected defective keyboard or defective keyboard mouse control ler defective system board Keyboard controller failure Keyboard mouse con troller failed Defective keyboard mouse controller defec tive system board Beep Codes and Error Messages 3 5 3 6 Table 3 2 System Error Messages continued Message Definition Probable Causes Keyboard data line failure Keyboard stuck key failure System cannot commu nicate with keyboard Keyboard cable connec tor loose or improperly connected defective keyboard or defective keyboard mouse control ler defective system board Memory address line failure at address read value expecting value Memo
84. nts Figure 1 2 shows the front panel features for the three chassis configurations Figures 1 3 through 1 5 show internal features of the three chassis configurations power button power indicator reset button hard disk drive diskette drive access indicator access indicator Low Profile Computer power button power indicator reset button hard disk drive access indicator 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 1 6 Dell OptiPlex GXa Systems Service Manual 3 5 inch diskette drive hard disk drive interface cable diskette tape drive interface cable power supply padlock ring voltage selection switch hard disk drive AC power receptacle security cable slot parallel port connector expansion card serial port 1 cage connector mouse connector expansion card slots 3 M vs 0 keyboard connector IN audio connectors 3 USB connectors 2 serial port 2 connector video connector NIC connector Figure 1 3 Internal View of the Low Profile Computer 3 5 inch diskette drive lt x hard disk drive auf SS bracket PY receptacle IH gt f E drive cage diskette tape drive interface cable power supply security cable slot padlock ring hard disk drive interface cable voltage selection switch
85. o support disk start up operations VFP volts flea power sometimes called standby power System Overview 1 19 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 13 through 1 15 show the wire side of the connectors 5 VDC white 5 VDC red common black 5 VDC red common black 5 VDC red common black TFSC brown PSON gray EE qe 5 VDC red 11 12 13 14 15 16 17 18 19 20 0000c 00050000 poao00050000 1 2 3 4 5 6 7 8 9 10 5 VDC red s common black common black common black 5 VDC red 12 VDC blue common black 12 VDC yellow PWRGOOD orange 5 VFP purple Pin 11 PSON should measure between 4 and 5 VDC except when the power button on the front panel is pressed taking PSON to its active low state Pin 19 Thermal fan speed control TFSC is a power supply input signal used to control the power supply fan speed Pin 5 PWRGOOD should measure between 4 and 5 VDC when the power supply is on and operating to indicate that all power supply output voltages are within ranges specified in Table 1 4 UY Figure 1 13 DC Power Connector P1 NACO P2 P3 P5 P6 P9 P4 anm a 3 4 1 2 1 zu dy 4 L 412 VDC yellow 45 VDC red common black common black common black common black 5 VDC red
86. oid possible dam age to the system board 4 Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the back of the chassis If a wrist grounding strap is not available periodically touch an unpainted metal surface on the back of the computer to discharge any static charge from your body Avoid touching components and contacts on a card and avoid touching pins on a chip to prevent static electricity damage Dell OptiPlex GXa Systems Service Manual Inside the Computer Figure 4 1 shows an internal view of the interior of the low profile computer and identifies major components for orientation Refer to this illustration as needed when performing the component removal replacement procedures in this chapter diskette drive CD ROM drive in external bay drive cage for external drive power supply internal hard disk drive expansion card system board cage Figure 4 1 Internal View of the Low Profile Computer Removing and Replacing Parts on the Low Profile Chassis 4 3 Computer Cover securing buttons 2 Figure 4 2 Computer Cover Removal To remove the computer cover follow these steps 1 Turn off power to all peripherals and disconnect the AC power cable from its AC 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 Raise the back of the cover and pivot it towa
87. onitor cannot display error messages during the POST the system may emit a series of beeps that identifies the problem or that can help you identify a faulty component or assembly Table 3 1 lists the beep codes that may be gener ated during the POST Most beep codes indicate a fatal error that prevents the system from completing the boot routine until the indicated condition is corrected When the system emits a beep code record the code and then find it in Table 3 1 If the table does not lead to the source of the problem run the appro priate tests in the system diagnostics to assist in troubleshooting the problem Beep Codes and Error Messages 3 1 Table 3 1 POST Beep Codes Beep Code Error Probable Causes 1 1 3 NVRAM write read failure Defective system board 1 1 4 BIOS checksum failure Faulty BIOS or defective system board 1 2 1 Programmable interval timer Defective system board failure 1 2 2 DMA initialization failure 1 2 3 DMA page register write read failure 1 3 1 Main memory refresh verifi Faulty or improperly seated cation failure DIMM or defective system board 1 3 2 No memory installed No memory installed or faulty or improperly seated DIMM 1 3 3 Chip or data line failure inthe Faulty or improperly seated first 64 KB of main memory DIMM 1 3 4 Odd even logic failure in the first 64 KB of main memory 1 4 1 Address line failure in the first 64 KB of main memory 1 4 2 Parity failure in the first
88. or IDE1 DSKT front of computer Figure 6 20 System Board Components Removing and Replacing Parts on the Mini Tower Chassis 6 21 DIMMs 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 see Figure 6 20 3 To remove a DIMM push outward on the DIMM socket s securing clips until the DIMM is released from its socket 4 Lift the DIMM away from the socket K amp securing clips Figure 6 21 DIMM Removal 5 Reinstall the replacement DIMM by pressing the DIMM fully into the socket while closing the securing clips to lock the DIMM into the socket securing clips Figure 6 22 DIMM Installation 6 Replace all assemblies and cables previously removed Video Memory You can upgrade video memory from 2 to 4 MB by installing a video memory upgrade module into 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 6 22 Dell OptiPlex GXa Systems Service Manual To install the video memory upgrade follow these steps 1 Remove the expansion card cage CAUTION To avoid possible damage to the video memory upgrade socket and or video memory upgrade module the module is keyed and must be correctly positioned before inserting it into the socket 2 Orient the
89. os 1 12 System Board Jumpers ou ony vacet eh Ye Ete qms EE PS 1 14 Interrupt Assignments espia ded res eR RE Ri PES 1 15 DMA Channel Assignments 0 0 0 eee 1 16 Hard Disk Drive Service Information 00 0000 1 17 Hard Disk Drive for the Low Profile Computer 1 18 Hard Disk Drive for the Midsize Computer 1 18 Hard Disk Drive for the Mini Tower Computer 1 18 Power Supply Service Data 0 cece eee eee eee 1 18 Pin Assignments for the DC Power Connectors 1 20 DC Power Distribution 2 0 0 0 0 eee eee ee eee 1 21 Technical Specifications A E EREERdUES 1 27 Chapter 2 Basic Troubleshooting 2 1 Initial User Contact de eve ee tia 2 1 External Visual Inspections 4s teer be b e Vv E a LES PE 2 2 Observing the Boot Routine 0 0 eee eens 2 3 Internal Visual Inspection 4 6 acca ned a a t RE DURER RE RI EE 2 4 Eliminating Resource Conflicts 0 0 0 0 eee eee eee 2 6 Running the System Diagnostics 0 2 eee ee eee ee eee 2 6 Getting Help iso heb eee PREDA ee eee Rowe bed 2 6 Chapter 3 Beep Codes and Error Messages 3 1 POST Beep Codes ik A E baa peed RE Rd EY nes 3 1 System Brror MeSsdPes e ced euex Qui es EY Ox e RR REI EP SAY 3 3 Chapter 4 Removing and Replacing Parts on the Low Profile Chassis erlernen 4 1 Recommended Too eo
90. over upside down A Su posts 2 ring tabs 2 Figure 5 5 Front Panel Insert Removal 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 To replace a front panel insert position the front panel insert then press the ring tabs over the posts If necessary use a 1 4 inch nutdriver to help push on the ring tabs Removing and Replacing Parts on the Midsize Chassis 5 7 Control Panel chassis hooks 2 control panel cable control panel Figure 5 6 Control Panel Removal 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 system board see Figure 5 18 3 Remove the mounting screw holding the control panel to the chassis 4 Slide the control panel out of the hooks holding it to the chassis Note the routing of the control panel cable as you remove it from the chassis 5 8 Dell OptiPlex GXa Systems Service Manual Dri ves Figure 5 6 shows an example of drive hardware that can be installed in the com puter Refer to this figure when you perform any of the procedures in the following subsections system power DC power cable diskette tape drive supply interface cable Nac LA ed 3 5 in
91. ower 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 5 12 Dell OptiPlex GXa Systems Service Manual 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 5 12 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 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 hard disk drive 3 Slide the drive out of the hard disk drive bracket Removing and Replacing Parts on the Midsize Chassis 5 13 System Power Supply power supply DC power cables die t Figure 5 13 System Power Supply Removal 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 and rotate it to the right until it stops Press the securing tab to the left to release the power supply 3 Disconnect the DC power cables from the system board and the drives
92. pro vides an automatic drive type detect feature To use this feature highlight the appro priate Drive category and type a for automatic If none of the supported drive types matches the parameters of the new drive enter parame ters directly To do so highlight the appropriate Drive category Drive 0 or Drive 1 and type u to display User1 Press lt Tab gt to highlight each of the parameter fields in succession and enter the appropriate number for each field NOTE For EIDE devices such as EIDE CD ROM drives and EIDE tape drives that are using the built in EIDE controller set the appropriate Drive category to Auto Reserved Memory Designates a region of system board memory that can be supplied by an expansion card This feature should not be enabled unless an expansion card that requires special addressing is installed CPU Speed Indicates processor speed at which system boots the processor s rated speed or a slower compatibility speed which disables cache Num Lock Determines whether keyboard s Num Lock mode is activated Keyboard Errors Enables or disables reporting of keyboard errors during POST System Setup Program Table A 1 System Setup Categories continued Category Function System Password Displays current status of system s password security feature Also used to assign and verify a new password Password Status Provides an extra measure of sy
93. r follow these steps 1 Turn off power to all peripherals and disconnect the AC power cable from its AC outlet 2 Pressin on the two securing buttons until the cover is free to swing up 3 Raise the back of the cover and pivot it toward the front of the computer 4 Lift the cover off the hooks at the front of the chassis Four plastic hooks on the inside 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 Removing and Replacing Parts on the Midsize Chassis 5 5 Eject Power and Reset Buttons computer cover upside down eject button power button MERLO Figure 5 4 Eject Power and Reset Button Removal To remove the eject power and reset buttons follow these steps 1 Lay the computer cover upside down on a flat work surface with the back of the cover facing you 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button or the reset button use a small screw driver and push in on the two or three plastic clips that hold the button to the computer cover When these clips are released the button comes free from the front panel of the cover 5 6 Dell OptiPlex GXa Systems Service Manual Front Panel Inserts 5 25 inch front r panel insert computer c
94. rd Non system disk or disk QIIQE Diskette in drive A or hard disk drive does not have bootable operating system installed on it Faulty diskette diskette tape drive subsystem or hard disk drive sub system Not a boot diskette No operating system on diskette No operating system on diskette Plug and Play Configuration Error System encountered problem in trying to configure one or more expansion cards System resource conflict Read fault d sec found Request tor not MS DOS cannot read from diskette or hard disk drive System could not find particular sector on disk or requested sec tor defective Faulty diskette diskette tape drive subsystem or hard disk drive sub system defective system board Reset failed Disk reset operation failed Improperly connected diskette tape drive hard disk drive interface cable or power cable Sector not found MS DOS unable to locate sector on diskette or hard disk drive Defective sectors on dis kette or hard disk drive Seek error MS DOS unable to locate specific track on diskette or hard disk drive Defective diskette or hard disk drive Beep Codes and Error Messages 3 8 Table 3 2 System Error Messages continued Message Definition Probable Causes Seek opera tion failed System could not find particular address mark on disk Faulty diskette or har
95. rd connector 6 18 Dell OptiPlex GXa Systems Service Manual Riser Board riser board riser board mounting screws 2 slots 2 expansion card cage Figure 6 18 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 3 Remove the riser board mounting screws 4 Slide the riser board away from the release handle until it stops then lift the riser board away from the expansion card cage Removing and Replacing Parts on the Mini Tower Chassis 6 19 System Board screw 4 d gs slots 5 A tabs 5 oe Figure 6 19 System Board Removal 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 5 Slide the system board toward the front of the chassis until it stops 6 Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board NOTE If you are replacing the system board remove all DIMMs the video memory upgrade module if present the single edge contact SEC cartridge heat sink assembly and the guide bracket assembly from the old system board and install
96. rd the front of the computer 5 Lift the cover off of the hooks at the front of the chassis Three plastic hooks on the inside 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 4 4 Dell OptiPlex GXa Systems Service Manual Eject Power and Reset Buttons eject button computer cover upside inm reset button E ad ps EG y power button Figure 4 3 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 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button or the reset button use a small screw driver and push in on the two or three plastic clips that hold the button to the computer cover When these clips are released the button comes free from the front panel of the cover Removing and Replacing Parts on the Low Profile Chassis 4 5 4 6 Front Panel Inserts 5 25 inch front panel insert P computer cover upside down d posts 2 ring tabs 2 Figure 4 4 Front Panel Insert Removal To remove a front panel insert follow these steps 1 Lay the computer cover upside down on a flat work surfac
97. ront Midsize Computer Figure 1 12 Computer Orientation Information System Overview Hard Disk Drive for the Low Profile Computer The hard disk drive assembly consisting of the hard disk drive and the hard disk drive bracket is located inside the chassis at the left front of the computer and is attached to the bottom of the chassis One EIDE or SCSI 1 inch high hard disk drive can be mounted on the hard disk drive bracket Hard Disk Drive for the Midsize Computer The hard disk drive bracket is located next to 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 Hard Disk Drive for the Mini Tower Computer 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 Power Supply Service Data The low profile computers have a 145 W system power supply the midsize computers have a 200 W system power supply and the mini tower computers have a 230 W power supply All system power supplies can operate from an AC power source of 115 VAC at 50 to 60 Hz or 230 VAC at 50 to 60
98. ry data line failure at address read value expect ing value Memory double word logic failure at address read value expect ing value Memory odd even logic failure at address read value expecting value Memory write read failure at address read value expect ing value During memory test value read at address was incorrect Faulty or improperly seated DIMMs or defec tive system board Memory alloca tion error Software in use con flicts with operating system application pro gram or utility Faulty application pro gram or utility Memory tests terminated by keystroke Memory test did not complete POST memory test termi nated by pressing lt Spacebar gt Dell OptiPlex GXa Systems Service Manual Table 3 2 System Error Messages continued Message Definition Probable Causes No boot device available System does not recog nize diskette drive or hard disk drive from which it is trying to boot Faulty diskette diskette tape drive subsystem hard disk drive hard disk drive subsystem or no boot disk in drive A No boot sec tor on hard disk drive Configuration settings in System Setup pro gram incorrect or operating system corrupted Incorrect configuration settings in System Setup program or no operating system on hard disk drive No timer tick interrupt Timer on system board malfunctioning Defective system boa
99. sion 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 5 16 Dell OptiPlex GXa Systems Service Manual Riser Board riser board mounting screws 2 slots 2 expansion card cage Figure 5 16 Riser Board Removal To remove the riser board follow these steps 1 Remove the expansion card cage and all expansion cards 2 Ona flat work surface turn the expansion card cage over with the riser board facing up 3 Remove the riser board mounting screws 4 Slide the riser board down until it stops then lift the riser board away from the expansion card cage Removing and Replacing Parts on the Midsize Chassis 5 17 System Board screw 4 d gs slots 5 A tabs 5 oe Figure 5 17 System Board Removal 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 5 Slide the system board toward the front of the chassis until it stops 6 Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board NOTE If you are replacing the system board remove all DIMMs the video memory upgrade module if present
100. spection of the exterior of the computer the monitor the keyboard any peripherals and cables While per forming the visual inspection make any necessary corrections To perform the external visual inspection follow these steps 1 2 Turn off the computer the monitor and all peripherals Verify that all power cables are properly connected to the computer the monitor and peripherals and their power sources Verify that the keyboard and mouse interface cables are firmly attached to the proper connectors on the back of the computer For a PS 2 compatible mouse the keyboard and mouse interface cable con nectors are identical except for their labels For a serial mouse the mouse interface cable must be firmly attached to one of the serial port connectors and its captive screws must be secure enough to ensure a firm connection Verify that any devices attached to the serial and parallel port connec tors are properly connected Each of the serial and parallel interface cables must be firmly attached to an appropriate connector on the back of the computer as well as to the interface connector on the device The captive screws that secure these connectors at each end of the interface cable must be secure enough to ensure a firm connection Verify that the video interface cable is firmly attached to the video con nector on the back of the computer and to the connector on the back of the monitor For proper connection of the vi
101. stem security by letting you set the system password to Locked or Unlocked Boot Sequence Determines whether system boots from dis kette if present or hard disk drive Setup Password Restricts access to System Setup program 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 Management With the Power Management category enabled DPMS monitors and most EIDE drives automatically switch into low power mode during periods of system inactivity CAUTION Before enabling this feature check the monitor documentation to make sure the system has a DPMS compliant monitor Otherwise there is a risk of dam aging the monitor NOTE Not all EIDE hard disk drives support this feature Enabling this feature for drives that do not support it may cause the EIDE drive to become inoperable until the system is restarted and the Power Management category is disabled Sound Enables On or disables Off the integrated sound controller NIC Enables On or disables Off the NIC Mouse Enables or disables the built in PS 2 compatible mouse port Serial Port Configures system s built in serial port 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 Parallel Mode Controls whether syste
102. t before attempting to pry out the battery Otherwise you may damage the system board by prying off the socket or by breaking traces on the system board 5 Remove the battery by carefully prying it out of its socket with your fingers or with a blunt nonconducting object such as a plastic screwdriver WARNING There is a danger of the new battery exploding if it is in correctly installed When you replace the system battery orient the new battery with the facing up see Figure 5 23 Replace the battery only with the same or equivalent type recommended by the manufacturer Discard used batteries according to the manufacturer s instructions 6 Insert the battery into the socket with the positive side labeled facing upwards into its socket and snap it into place 7 Replace the expansion card cage replace the computer cover re connect all cabling and reboot the system 8 Enter the System Setup program and configure the system using the information from the printouts you made earlier 9 Turn off the computer wait 10 or more minutes and reenter the System Setup program to ensure that the date and time are still correct indicat ing that the system battery is functioning correctly 5 24 Dell OptiPlex GXa Systems Service Manual wi Removing and Replacing Parts on the Mini Tower Chassis qm V This chapter provides procedures for removing the components assemblies and subassembl
103. tem board 4 16 Dell OptiPlex GXa Systems Service Manual System Board Components The subsections that follow Figure 4 15 contain procedures for removing replacing system board components ine outjack D CIS serial port 2 connector Jac SERIAL2 vere video connector keyboard mouse jinaciniaeht MONITOR USB connectors connectors stacked dip USB KYBD MOUSE LINE IN H a F parallel serial port 1 m zr B connectors stacked PARALLEL SERIAL 1 pene microprocessor fan video memory T connector FAN upgrade socket Sn VIDEO_UPGRADE TA SEC cartridge Maa SLOT1 CD ROM audio interface 14 DIMM sockets 3 connector CD IN DIMM A DIMM C EUER main power input rn connector POWER_1 riser board I connector RISER dio Rowe secondary EIDE connector POWER 2 interface connector IDE2 AER diskette tape drive control panel system board jumpers primary EIDE BR interface connector interface connector connector PANEL IDE1 DSKT front of computer Figure 4 15 System Board Components Removing and Replacing Parts on the Low Profile Chassis 4 17 DIMMs 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 see Figure 4 15 3 To remove a DIMM push outward on the DIMM socket s securing clips until the DIMM is released from its socket 4 Lift the DIMM away from
104. the socket securing clips Figure 4 16 DIMM Removal 5 Reinstall the replacement DIMM by pressing the DIMM fully into the socket while closing the securing clips to lock the DIMM into the socket securing clips Figure 4 17 DIMM Installation 6 Replace all assemblies and cables previously removed Video Memory You can upgrade video memory from 2 to 4 MB by installing a video memory upgrade module into 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 4 18 Dell OptiPlex GXa Systems Service Manual To install the video memory upgrade follow these steps 1 Remove the expansion card cage CAUTION To avoid possible damage to the video memory upgrade socket and or video memory upgrade module the module is keyed and must be correctly positioned before inserting it into the socket 2 Orient the video memory upgrade module as shown in Figure 4 18 Then carefully align the module s edge connector pins with the socket ensuring that the slot in the module mates with the socket key notch video memory video memory upgrade socket upgrade module Figure 4 18 Installing a Video Memory Upgrade Module 3 Press the video memory upgrade module firmly into the socket and pivot the module downward until the module clicks into place NOTE If you do
105. them on the replacement board Also set the jumpers on the new system board so they are identical to those on the old board unless a micro processor upgrade is being installed When you reinstall the system board before you slide the system board back to lock it in position push down near each slot to engage the grounding clip onto its corresponding tab Push evenly on both sides of the system board as you slide it into position do not twist the system board 6 20 Dell OptiPlex GXa Systems Service Manual System Board Components The subsections that follow Figure 6 20 contain procedures for removing replacing system board components microphone line out jack jack MIC serial port 2 connector LINE OUT SERIAL2 video connector USB connectors keyboard mouse line in jack MONITOR connectors stacked LINE IN KYBD MOUSE c a parallel serial port 1 onnectors stacked NIC connector ENET video memory upgrade socket VIDEO UPGRADE CD ROM audio interface connector CD IN riser board microprocessor fan connector FAN SEC cartridge SLOT1 DIMM sockets 3 DIMM A DIMM C main power input connector POWER 1 connector RISER 3 3 V power input secondary EIDE connector POWER_2 interface connector IDE2 Tas E battery socket BATTERY i f diskette tape drive control panel system board jumpers primary FIDE interface connector connector PANEL interface connect
106. 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 The other hard disk drive attaches to the hard disk drive bracket at the bottom of the hard disk drive 3 Slide the drive out of the hard disk drive bracket Removing and Replacing Parts on the Mini Tower Chassis 6 15 System Power Supply DC power cables power supply power supply detent link securing tab Figure 6 15 System Power Supply Removal To remove the system power supply follow these steps 1 Disconnect the AC power cable from the back of the power supply 2 Free the system power supply from the securing tab labeled RELEASE gt and rotate it upward until it locks Press the securing tab to release the power supply 3 Disconnect the DC power cables from the system board and the drives 4 Facing the left side of the computer move the front end of the system power supply toward you and lift it up to disengage the power supply from the slot in the chassis 5 Lift the system power supply from the computer When you reinstall the power supply place the power supply detent link over the pin on the power supply as you position the power supply in the chassis opening 6 16 Dell OptiPlex GXa Systems Service Manual Expansion Cards The computer has a removable
107. til the latches click 6 Lift the SEC cartridge heat sink assembly out of its guide bracket assembly connector on the system board NOTE When installing the SEC cartridge heat sink assembly carefully orient the assembly and press firmly with up to 25 pounds of force to mate the SEC cartridge with its connector Then slide the heat sink release latches outward to lock the assembly onto the metal standoffs System Battery battery ES e cd BATTERY socket Figure 6 25 System Battery Installation Removing and Replacing Parts on the Mini Tower Chassis 6 25 To remove the system battery follow these steps 1 If possible boot the system and enter the System Setup program Then record important system configuration information see Appendix A System Setup Program for details 2 Turn off power to all peripherals and disconnect the AC power cable from its AC 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 see Figure 6 20 CAUTION If you pry out the battery with a blunt object be careful not to touch the system board with the object Ensure that the object is inserted between the battery and the socket before attempting to pry out the battery Otherwise you may damage the system board by prying off the socket or by breaking traces on the system board 5 Remove the battery by c
108. tionary Measures found later in this chapter You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided Recommended Tools Most of the procedures in this chapter require the use of one or more of the fol lowing tools e Small flat blade screwdriver e Wide flat blade screwdriver e Fl and 2 Phillips screwdrivers e 4 inch nutdriver Tweezers or long nose pliers Also use a wrist grounding strap as explained in the next section Precaution ary Measures Removing and Replacing Parts on the Low Profile Chassis 4 1 4 2 Precautionary Measures 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 WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the system per form the following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury Also dis connect any telephone or telecommunication lines from the computer 3 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 av
109. ty indicator 1 4 power button 1 6 reset button 1 6 cover removal low profile computer 4 4 midsize computer 5 5 mini tower computer 6 4 D DC power cables low profile computer 1 22 cables midsize and mini tower computers 1 24 connector pin assignments 1 20 distribution low profile computer 1 23 distribution midsize computer 1 25 distribution mini tower computer 1 26 voltage ranges 1 19 Dell OptiPlex GXa Systems Service Manual diagnostics about 1 12 quick tests 2 6 specific tests 2 6 DIMMs installation low profile computer 4 18 installation midsize computer 5 20 installation mini tower computer 6 22 removal low profile computer 4 18 removal midsize computer 5 20 removal mini tower computer 6 22 types and sizes 1 11 disk drives See drives diskette drives controller 1 3 removal low profile computer 4 9 removal midsize computer 5 10 removal mini tower computer 6 12 DMA channel assignments 1 16 documentation online 1 12 drives 3 5 inch diskette drive removal low profile computer 4 9 3 5 inch diskette drive removal midsize computer 5 10 3 5 inch diskette drive removal mini tower computer 6 12 CD ROM drive removal low profile computer 4 10 CD ROM drive removal midsize computer 5 11 CD ROM drive removal mini tower computer 6 12 hard disk drive removal low profile computer 4 11 hard disk drive removal midsize computer 5 12 hard disk dri
110. ve removal mini tower computer 6 14 location low profile computer 4 8 location midsize computer 5 9 location mini tower computer 6 10 drives continued tape drive removal low profile computer 4 10 tape drive removal midsize computer 5 11 tape drive removal mini tower computer 6 12 E EIDE subsystem 1 3 eject button removal low profile computer 4 5 midsize computer 5 6 mini tower computer 6 6 error messages list of 3 3 Ethernet controller 1 4 expansion card cage removal low profile computer 4 13 midsize computer 5 15 mini tower computer 6 17 expansion card removal low profile computer 4 14 midsize computer 5 16 mini tower computer 6 18 expansion card slots low profile computer 1 9 midsize computer 1 9 mini tower computer 1 10 external connector assignments low profile computer 1 7 midsize computer 1 7 mini tower computer 1 8 external visual inspection 2 2 F floor stand removal midsize computer 5 4 front bezel removal mini tower computer 6 5 front panel features 1 6 front panel insert removal low profile computer 4 6 midsize computer 5 7 mini tower computer 6 7 6 8 H hard disk drives bracket removal midsize computer 5 12 bracket removal mini tower computer 6 14 options 1 17 removal low profile computer 4 11 removal midsize computer 5 13 removal mini tower computer 6 15 service information 1 17 help getting 2 6 l I O ports
111. video memory upgrade module as shown in Figure 6 23 Then carefully align the module s edge connector pins with the socket ensuring that the slot in the module mates with the socket key notch lt video memory video memory upgrade socket upgrade module Figure 6 23 Installing a Video Memory Upgrade Module 3 Press the video memory upgrade module firmly into the socket and pivot the module downward until the module clicks into place NOTE If you do not hear a sharp click when installing the video memory upgrade module remove the module and repeat steps 2 and 3 4 Replace the expansion card cage 5 Replace the computer cover and reconnect the AC power cable to the AC outlet Press the power switch on the computer to reboot the system NOTE As the system boots it automatically detects the presence of the new video memory upgrade module and automatically changes the system con figuration information in the System Setup program 6 Enter the System Setup program and confirm that 4 MB is shown in the Video Memory category If the total memory is listed incorrectly repeat steps 1 through 6 to reseat the video memory upgrade module and ver ify that the computer acknowledges the module 7 Run the system diagnostics Video Test Group to test the new video memory upgrade module Removing and Replacing Parts on the Mini Tower Chassis Microprocessor To take advantage of future options in processor speed and functional

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