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Dell 420 Personal Computer User Manual

1. A CAUTION The RIMMs can get extremely hot during system operation To avoid dangerous burns be sure that the RIMMs have had sufficient time to cool before you touch them X NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 28 1 Remove the computer cover according to the instructions in Computer Cover 2 Press the securing clips outward simultaneously until the RIMM disengages and pops out slightly from the socket see Figure 30 Figure 30 RIMM Removal 1 Securing clips 2 To install a RIMM perform the following steps A CAUTION To avoid the possibility of electric shock turn off the computer and any peripherals disconnect them from their electrical outlets and then wait at least 5 seconds before you remove the computer cover Also before you upgrade memory see the other precautions in Precautionary Measures 1 Remove the computer cover according to the instructions in Computer Cover 2 If necessary remove any RIMMs that occupy sockets in which you plan to install the RIMMs NOTES If you are not installing a replacement RIMM at this time you MUST remove the remaining RIMM in the pair and install a pair of continuity modules CRIMM When operating with a single pair of RIMMs they MUST occupy sockets RIMMB 1 and RIMMA 2 with CRIMMs installed in
2. To remove the chassis intrusion switch and install a replacement perform the following steps 1 Disconnect the chassis intrusion switch cable from the control panel see Figure 26 Note the routing of the chassis intrusion cable as you remove the cable from the chassis The cable is routed through an enlarged hole in the chassis and through a hole in the disk drive cage door The chassis intrusion switch is mounted on the left front of the chassis see Figure 26 Slide the chassis intrusion switch out of its slot on the chassis and carefully remove the switch and its attached cable from the chassis Install the replacement chassis intrusion switch and cable Replace the computer cover Then reconnect your computer and peripherals to their power sources and turn them on Y NOTE After you remove and replace the cover the chassis intrusion detector will cause the following message to be displayed at the next system start up ALERT Cover was previously removed To reset the chassis intrusion detector enter System Setup select System Security and reset Chassis Intrusion to Enabled or Enabled Silent see your User s Guide for instructions Power Supply To access some components on the system board you may have to rotate the system power supply out of the way Use this procedure to rotate the supply out of the chassis or to completely remove it To rotate or remove the power supply perform the following steps 4 CAU
3. Power Supply System Board Components RIMMs Microprocessor Heat Sink Assembly Microprocessor Cooling Fan Battery System Board This section provides procedures for removing and replacing the components assemblies and subassemblies in the Dell Precision WorkStation 420 mini tower chassis system Unless otherwise noted each procedure assumes that the following conditions exist You have performed the steps in Precautionary Measures 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 file require the use of one or more of the following tools Wide flat blade screwdriver 2 Phillips head screwdriver A wrist grounding strap as explained in Precautionary Measures Precautionary Measures Before you perform any procedure in this section take a few moments to read the following caution for your personal safety and to prevent damage to the system from electrostatic discharge ESD CAUTION FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the system perform the following steps in the sequence listed 1 Turn off the computer and all peripherals 2 Disconnect the computer and peripherals from their AC power sources Also disconnect any telephone or telecommunication lines from the computer Doing
4. 1 Check all cable connections especially those that might have come loose during your work Fold cables out of the way so that they do not catch on the computer cover Make sure cables are not routed over the drive cage they will prevent the cover from closing properly Check to see that no tools or extra parts including screws are left inside the computer chassis Face the left side of the computer and hold the cover at a slight angle as shown in Figure 3 Align the top of the cover with the top of the chassis and insert the three hooks on the cover into the three recessed slots on the computer chassis so that the tabs catch the hooks inside the slots Pivot the cover down toward the bottom of the chassis and into position Make sure that the securing hooks at the bottom of the cover click into place Interior Service Label Figure 4 shows the location of the interior service label on the inside of the system cover This label shows the location of components within the chassis and locations of system board components and connectors It also contains an important notice that provides instructions you need to follow to help prevent damage to your system board while you troubleshoot and service the computer system Figure 4 Interior Service Label Internal View Figure 5 shows the chassis with the cover removed to help you orient yourself when you work inside the computer Figure 5 Orientation View Front Panel Externall
5. Carefully raise the front of the system board and lift the board out of the chassis at an angle To replace the system board perform the following steps 1 Carefully replace the system board in the chassis by performing steps 11 through 13 of the removal process in reverse 2 Push down near each slot to engage the grounding clip onto its corresponding tab 3 Push evenly on both sides of the system board as you slide and lock it into position do not twist the system board 4 Reinstall the mounting screw 5 Reinstall all components on the system board by performing steps 4 through 10 of the removal process in reverse 6 Set the jumpers on the new system board so that they are identical to those on the old board unless you are installing a microprocessor upgrade 7 Replace the computer cover connect all cables and restart the system Run System Setup to ensure that your settings are correct and that all system board components are correctly reported 8 Run the Dell Diagnostics Back to Contents Page Back to Contents Page Mini Tower Chassis Removing and Replacing Parts Dell Precision WorkStation 420 Systems Service Manual Overview Recommended Tools Precautionary Measures Restarting the System Computer Cover Interior Service Label Internal View Front Panel Front Panel Inserts Drives AGP Card Brace Overview Expansion Cards Expansion Card Guide and Fan Control Panel Chassis Intrusion Switch
6. RIMMB 3 and RIMMA 4 3 Install the RIMMs a Locate the plastic securing clips at each end of the socket see Figure 31 b Press the clips outward until they snap open c Press the RIMM straight into the slot running down the center of the socket until the securing tabs snap into place around the ends of the RIMM Figure 31 RIMM Installation 1 Securing clips 2 2 Notches 2 4 Replace the computer cover and reconnect your computer and peripherals to their electrical outlets and turn them on Y NOTE After you remove and replace the cover the chassis intrusion detector causes the following message to appear on the screen at the next system start up ALERT Cover was previously removed The system detects that the new memory does not match the existing system configuration information and generates the following message The amount of system memory has changed Strike the Fl key to continue F2 to run the setup utility 5 Press lt F2 gt to enter System Setup and check the value for System Memory The system should have already changed the value of System Memory to reflect the newly installed memory Verify the new total If it is correct skip to step 7 6 Ifthe memory total is incorrect turn off and disconnect your computer and peripherals from their electrical outlets Remove the computer cover rotate the power supply and check the installed RIMMs to make sure that they are seated properly in their sockets Th
7. cover off the hooks at the front of the chassis Figure 2 Computer Cover Replacement 1 Securing buttons 2 To replace the computer cover perform the following steps 1 Check all cable connections especially those that might have come loose during your work Fold cables out of the way so that they do not catch on the computer cover Make sure cables are not routed over the drive bracket they will prevent the cover from closing properly 2 Check to see that no tools or extra parts including screws are left inside the computer s chassis 3 Facing the left side of the computer hold the cover at a slight angle as shown in Figure 2 4 Fit the three cover hooks into the rectangular slots on the chassis It might be helpful to look down into the chassis to verify that the hooks are in place 5 Pivot the cover down toward the back and into position Make sure that the two securing buttons click into place Interior Service Label Figure 3 shows the location of the interior service label on the inside of the top cover This label shows the location of components within the chassis and locations of system board components and connectors It also contains an important notice that provides instructions you need to follow to help prevent damage to your system board while you troubleshoot and service the computer system Figure 3 Interior Service Label Internal View Figure 4 shows the chassis with the top cover removed Figure
8. gt w ep Lrg AA wd Documents Dell Precision WorkStation 420 Systems Service Manual Desktop Chassis Removing and Replacing Parts Mini Tower Chassis Removing and Replacing Parts es NOTE You can obtain the latest version of this document from the Support section of the Dell Web site at http www dell com Notes Notices and Cautions Throughout this guide blocks of text may be accompanied by an icon and printed in bold type or in italic type These blocks are notes notices and cautions and they are used as follows E4 NOTE A NOTE indicates important information that helps you make better use of your system NOTICE A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem _ CAUTION A CAUTION indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury Information in this document is subject to change without notice 1999 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 Dell Precision and the DELL logo are trademarks of Dell Computer 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 inte
9. of the jumpers on the system board Table 1 lists the system board jumpers and their settings Figure 29 System Board Jumpers Jumpers are small blocks on a circuit board with two or more pins emerging from them Plastic plugs containing a wire fit down over the pins The wire connects the pins and creates a circuit NOTICE Make sure your system is turned off before you change a jumper setting Otherwise damage to your system or unpredictable results may occur To change a jumper setting pull the plug off its pin s and carefully fit it down onto the pin s indicated Table 1 System Board Jumper Settings default Password features are enabled Password features are disabled RTCRST Real time clock reset Can be used for troubleshooting purposes jumpered unjumpered System Board Labels Table 2 lists the labels for connectors and sockets on your system board and it gives a brief description of their functions Table 2 System Board Connector and Socket Labels FAN_SYS Microprocessor fan connector RIMMs 09 4 aad m J 4 CAUTION Before you remove the computer cover see Precautionary Measures To remove a Rambus in line memory module RIMM perform the following steps 4 CAUTION To avoid the possibility of electric shock turn off the computer and any peripherals disconnect them from their electrical outlets and then wait at least 5 seconds before you remove the computer cover
10. the groove on the chassis foot after installing the hinge pin System Board Components Figure 28 shows the system board and the location of all its sockets and connectors Figure 28 System Board Components O DOAN OO OF FPF WO N O O WN N NY NY YN YN NN NY NO amp a BF BF FF F2 FF FF N O O O N OO Oo FPF WON O BODO DAN OO AO FBP WO N O CD ROM drive audio connector Main power 1 connector desktop chassis Diskette connector Main power 2 connector desktop chassis Battery RIMM memory sockets SCSI narrow connector Secondary EIDE connector Suspend To RAM LED Jumper block see System Board Jumpers System board screw LVD SCSI connector Primary EIDE connector Standby power LED Control panel connector MT power 2 connector mini tower chassis MT power 1 connector mini tower chassis Modem TAPI connector Card cage fan power connector Auxiliary sound input connector PCI RAID expansion card connector Auxiliary hard disk drive access LED connector PCI expansion slots AGP graphics slot Remote wakeup on LAN connector Primary processor 0 socket Network cable connector Diagnostic LEDs USB connectors Secondary processor 1 socket Line in connector Line out connector 33 Microphone connector 34 Mouse keyboard stacked 35 System fan power connector 36 Serial port 1 serial port 2 stacked 37 Parallel port external SCSI port stacked System Board Jumpers Figure 29 shows the location
11. the system board is not on If it is on you may need to wait 10 to 30 seconds for it to go out See Figure 22 or the internal service label Restarting the System To restart the system and reset the chassis intrusion detector perform the following steps 1 Replace the computer cover and reconnect the computer and peripherals to their power sources and turn them on Y NOTE When you start the system the chassis intrusion detector will cause the following message to be displayed at the next system start up ALERT Cover was previously removed 2 To reset the chassis intrusion detector enter System Setup select System Security and reset Chassis Intrusion to Enabled or Enabled Silent Y NOTE If a setup password has been assigned by someone else contact the network administrator for information on resetting the chassis intrusion detector Computer Cover Figure 1 Computer Cover Removal 1 Securing buttons 2 To remove the desktop chassis computer cover perform the following steps 1 Turn off your computer and peripherals and observe the Caution for Your Personal Safety and Protection of the Equipment described in Precautionary Measures 2 If you have installed a padlock through the padlock ring on the back panel remove the padlock 3 Press in on the two securing buttons until the cover is free to swing up see Figure 1 4 Raise the back of the cover and pivot it toward the front of the computer 5 Lift the
12. 4 Chassis Orientation View 1 Externally accessible drive bays 2 Hard disk drive bracket 3 System board 4 Expansion card slots 5 Padlock ring 6 I O panel connectors 7 Security cable slot 8 AC power receptacle 9 Power supply 10 Drive data cable Front Panel Inserts Figure 5 5 25 Inch Front Panel Insert Removal 1 Front panel insert 2 Ring tabs 2 3 Posts 2 To remove a 5 25 inch front panel insert perform the following steps 1 Hold the inverted top cover with the front facing you 2 From the front of the top cover use your thumbs to press inward on the insert until it snaps free of the cover To replace a 5 25 inch front panel insert position the two ring tabs over the posts on the inside of the bay opening and then press the ring tabs over the posts Expansion Cards The Dell Precision 420 systems provide five 32 bit Peripheral Component Interconnect PCI expansion card slots Slot 5 is shared with the RAID port function The system contains five 32 bit expansion slots and a 32 bit AGP Pro 50 4X slot If you use an AGP Pro 50 card it occupies the AGP slot and may occupy PCI slots 1 and 2 See Figure 6 for examples of these cards Y NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 22 Figure 6 Expansion Cards 1 32 bit PCI expansion car
13. Airflow shroud 2 Thumbscrews 2 3 Processor heat sink assembly 4 Guide bracket 5 Second processor nN To insert the new microprocessor heat sink assembly into the system board connector perform the following steps this procedure assumes the microprocessor removal procedure was just performed YK NOTE Dell recommends that only a technically knowledgeable person perform this procedure CAUTION Before you remove the computer cover see Precautionary Measures NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 22 1 Press the processor firmly into its connector until it is fully seated You must use up to 25 Ib of force to fully seat the processor in its connector 2 Install the two large thumbscrews that secure the heat sink to the system board 3 Replace the airflow shroud 4 Rotate the power supply back into position making sure that the securing tab snaps into place 5 Replace the computer cover and reconnect your computer and peripherals to their power sources and turn them on Y NOTE After you remove and replace the cover the chassis intrusion detector will cause the following message to be displayed at the next system start up ALERT Cover was previously removed 6 Enter System Setup and confirm that the top line in the System Data area corr
14. Airflow shroud 2 Thumbscrews 2 3 Processor heat sink assembly 4 Guide bracket 5 Second processor 1 Airflow shroud 2 Thumbscrews 2 3 Processor heat sink assembly 4 Guide bracket 5 Second processor 4 Insert the new microprocessor into the system board connector see Figure 33 10 11 Press the processor firmly into its connector until it is fully seated You must use up to 25 Ib of force to fully seat the processor in its connector Install the two thumbscrews Replace the airflow shroud Rotate the power supply back into position making sure that the securing tab snaps into place Replace the computer cover and reconnect your computer and peripherals to their power sources and turn them on EA NOTE After you remove and replace the cover the chassis intrusion detector will cause the following message to be displayed at the next system start up ALERT Cover was previously removed Enter System Setup and confirm that the top line in the System Data area correctly identifies the installed processor s While in System Setup reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled Silent u4 NOTE If a setup password has been assigned by someone else contact your network administrator for information on resetting the chassis intrusion detector Run the Dell Diagnostics to verify that the new microprocessor is operating correctly Microprocessor Cooling Fan Figure 34 M
15. I cards One AGP Pro110 card two PCI cards and one RAID card Expansion Card Removal To remove an expansion card perform the following steps 4 CAUTION Before you remove the computer cover see Precautionary Measures 1 Remove the computer cover 2 Rotate the power supply away from the system board 3 Remove the AGP card brace 4 Disconnect any cables connected to the card 5 Unscrew the mounting bracket screw of the card you want to remove 6 Grasp the card by its outside corners and ease it out of its connector 7 If you are removing the card permanently install a metal filler bracket over the empty card slot opening NOTE Installing filler brackets over empty card slot openings is necessary to maintain Federal Communications Commission FCC certification of the system The brackets also keep dust and dirt out of your computer Expansion Card Installation To install a replacement expansion card perform the following steps 4 CAUTION Before you remove the computer cover see Precautionary Measures 1 Remove the computer cover 2 Rotate the power supply away from the system board 3 Prepare the card as necessary using the instructions provided with the card 4 Insert the expansion card into the expansion card connector 5 Ifthe expansion card is full length insert the front end of the card into the corresponding card guide on the inside front of the chassis as you insert the card into its conne
16. ON Before you remove the computer cover see Precautionary Measures Y NOTE lf you are installing a replacement hard disk drive for one containing data you want to keep make a backup of your important files before starting this procedure 1 Remove the computer cover if it is not already off 2 Remove the front panel if it is not already off 3 Remove the drive bracket from the chassis as instructed in Hard Disk Drive Removal if it is not already off 4 Slide the replacement drive into the slot previously occupied by the drive you removed oriented so that the connectors on the back of the drive will face the back of the chassis with the power connector located above the data interface connector see Figure 16 5 Align the four screw holes of the drive and bracket Insert and tighten the screws see Figure 16 Figure 16 Inserting a Hard Disk Drive in the Bracket 1 Drive bracket 2 Drive 3 Screws 4 6 Reinstall the hard disk drive bracket in the chassis see Figure 17 Insert the bracket into the chassis by sliding it in until the tabs snap into place Rotate the drive door up and toward the chassis until it snaps securely into place Be sure to fold down the drive door handle see Figure 17 so that the front panel can be replaced on the chassis Figure 17 Inserting the Drive Bracket 1 Chassis drive cage 2 Drive bracket 3 Tabs 7 Connect a DC power cable to the power input connector on the back of the driv
17. TION Before you remove the computer cover see Precautionary Measures 1 2 3 Remove the computer cover Lay the computer on its right side as viewed from the front Disconnect the AC power cable from the AC power receptacle on the back of the power supply see Figure 27 Figure 27 Rotating the Power Supply 1 Power supply f 2 Release latch 3 AC power receptacle 4 AC power cable 4 Liftthe release latch and slide the power supply about 25 mm 1 inch toward the front of the system 5 Continue to apply pressure on the release latch while pulling the power supply towards the front of the computer and rotating the power supply out of the chassis See the instruction label on the side of the power supply for additional information ues NOTE Perform the next step only if you are completely removing the power supply from the chassis 5 To completely remove the power supply from the chassis a Remove the AGP brace b Remove all full length expansion cards c Remove the expansion card guide d Disconnect the DC cables connected to the drives and to the system board e Using a flat tipped screwdriver pry out the power supply hinge pin from the chassis foot f While supporting the weight of the power supply pull the power supply hinge pin completely out to release the power supply from the chassis When installing a replacement power supply remember to rotate and secure the L end of the hinge pin into
18. acket tabs snap into place in the drive bay Figure 13 5 25 Inch Drive Replacement 7 8 1 Drive Connect a DC power cable to the power input connector on the back of the drive see Figure 14 Connect the appropriate interface cable to the interface connector on the back of the drive see Figure 14 If your system came with an EIDE CD ROM or tape drive use the spare connector on the existing interface cable Otherwise use the EIDE interface cable provided in the drive kit NOTICE You must match the colored strip on the cable with pin 1 on the drive s interface connector to avoid possible damage to your system Figure 14 Attaching Cables to 5 25 Inch Drives 10 11 13 14 2 1 DC power cable 2 Power input connector 3 Interface connector 4 Interface cable For an EIDE tape drive or CD ROM drive connect the other end of the interface cable to the interface connector labeled IDE2 on the system board For a diskette drive connect the cable from the drive to the interface connector labeled DISKETTE on the system board Check all cable connections Fold cables out of the way to provide airflow for the fan and cooling vents If the 5 25 inch drive bay was previously empty remove the front panel insert from the front panel Replace the front panel Replace the computer cover reconnect your computer and peripherals to their power sources and turn them on If the replacement drive was not identical to th
19. age to your system or unpredictable results may occur To change a jumper setting pull the plug off its pin s and carefully fit it down onto the pin s indicated Table 1 System Board Jumper Settings Jumper Description PSWD default Password features are enabled Password features are disabled jumpered unjumpered RTCRST Real time clock reset Can be used for troubleshooting purposes System Board Labels Table 2 lists the labels for connectors and sockets on your system board and it gives a brief description of their functions Table 2 System Board Connector and Socket Labels RIMMs 4 CAUTION Before you remove the computer cover see Precautionary Measures To remove a Rambus in line memory module RIMM perform the following steps Aa CAUTION To avoid the possibility of electric shock turn off the computer and any peripherals disconnect them from their electrical outlets and then wait at least 5 seconds before you remove the computer cover A CAUTION The RIMMs can get extremely hot during system operation To avoid dangerous burns be sure that the RIMMs have had sufficient time to cool before you touch them 1 Remove the computer cover 2 Press the securing clips outward simultaneously until the RIMM disengages and pops out slightly from the socket see Figure 24 Figure 24 RIMM Removal 1 Securing clips 2 To install replacement memory perform the following steps 2 CAUTION T
20. asier access inside the chassis you may want to rotate the power supply out of the way temporarily To do so see Figure 20 Figure 15 5 25 Inch Drive Bracket 1 Metal tab 2 Drive bracket 3 Screws 4 Hard Disk Drive Bracket Removal To remove the hard disk drive bracket perform the following steps NOTICE If you are removing a hard disk drive that contains data you want to keep be sure you have a backup of your files before you begin this procedure CAUTION Before you remove the computer cover see Precautionary Measures Remove the compuier cover N Disconnect the DC power cable and data cable from the drive 3 Remove the screw holding the drive bracket to the drive bay 4 Rotate the drive bracket upward to disengage it from the latch on the drive bay slide it to the left and lift it out of the chassis see Figure 16 Figure 16 Hard Disk Drive Bracket Removal 1 Screw 2 Hooks 3 3 Drive bracket 4 Latch on drive bay Hard Disk Drive Removal To remove a hard disk drive from the drive bracket perform the following steps CAUTION Before you remove the computer cover see Precautionary Measures 1 2 Remove the four screws that secure the hard disk drive to the drive bracket Retain these screws they will be needed for the replacement drive Remove the hard disk drive Hard Disk Drive Replacement To install a replacement hard disk drive perform the following ste
21. ation of the PANEL connector 2 Remove the mounting screw that secures the control panel to the chassis 3 Disconnect the chassis intrusion switch cable connector from the control panel 4 Disconnect the thermal sensor cable connector from the control panel 5 Disconnect the speaker cable connector from the control panel 6 Remove the control panel and cable from the chassis To reinstall the control panel perform the removal procedure in reverse When you reinstall the control panel be sure to align the control panel alignment hole and the guide pin located on the left side of the chassis front Chassis Intrusion Switch Figure 10 Chassis Intrusion Switch Removal 1 Control panel 2 Screw 3 Chassis intrusion switch 4 CAUTION Before you remove the computer cover see Precautionary Measures To remove the chassis intrusion switch perform the following steps 1 From inside the chassis slide the chassis intrusion switch to the side to release it from the chassis 2 Disconnect the chassis intrusion switch cable connector from the control panel see Figure 9 3 Remove the chassis intrusion switch and cable from the chassis Note the routing of the chassis intrusion cable to ensure the replacement is routed in the same manner 4 Install the replacement chassis intrusion switch 5 Replace the computer cover Then reconnect your computer and peripherals to their power sources and turn them on Y NOTE After you remove and re
22. ct such as a plastic screwdriver When you replace the system battery orient the new battery with the facing up Insert the battery into its socket and snap it into place System Board Figure 30 System Board Removal 1 System board 2 Screw To remove the system board perform the following steps NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 22 a CAUTION The microprocessors and RIMMs can get extremely hot during system operation To avoid dangerous burns be sure that the microprocessors and RIMMs have had sufficient time to cool before you touch them 1 Remove the computer cover 2 Disconnect all cables from their connectors at the back of the computer 3 Rotate the power supply 4 Disconnect all cables from the system board 5 Remove the RIMMs 6 Remove the airflow shroud the primary processor and the secondary processor or terminator card 7 Remove all expansion cards from the system 8 Slide all externally accessible drives and brackets partially out of the chassis 9 Remove the hard disk drive bracket from the chassis 10 Remove the microprocessor cooling fan 11 Remove the screw that secures the system board to the bottom of the chassis See Figure 30 12 Slide the system board toward the front of the chassis until it stops 13
23. ctor Insert the card s edge connector firmly into the expansion card slot Gently press the card into the connector until it is fully seated See Figure 22 Figure 22 Installing an Expansion Card 1 Expansion card 2 Expansion card connector 3 Card edge connector 5 When the card is firmly seated in the connector secure the card s mounting bracket to the chassis with the screw you removed in step 5 of the removal procedure 6 Connect any cables that should be attached to the card Expansion Card Guide and Fan Figure 23 Expansion Card Guide and Fan Removal 1 Tab 2 Expansion card guide To remove the expansion card guide and fan perform the following steps 4 CAUTION Before you remove the computer cover see Precautionary Measures 1 Rotate the power supply away from the system board 2 Remove the AGP card brace 3 Remove all full length expansion cards 4 Press down on the top of the card guide to release the tab from its slot located on the lower left area on the front of the chassis see Figure 23 5 Rotate the top of the card guide away from the chassis front 6 Disconnect the fan power cable from its connector on the system board 7 Lift the expansion card guide and its attached fan out of the chassis Figure 24 Expansion Card Guide Fan Removal p 1 Fan power cable lt 2 Fan 3 Plastic locking tabs 2 To remove an expansion card guide cooling fan perform the following steps 4 CAUTION Be
24. d 2 32 bit AGP card Figure 7 AGP Pro50 Card Extension Figure 7 shows the card extension that may occupy PCI slots 1 and 2 The following is a list of valid expansion card combinations One AGP card and five PCI cards One AGP card four PCI cards and one RAID card One AGP Pro50 card and four PCI cards One AGP Pro50 card three PCI cards and one RAID card Expansion Card Removal To remove an expansion card perform the following steps 4 CAUTION Before you remove the computer cover see Precautionary Measures 1 Remove the computer cover 2 Disconnect any cables connected to the card 3 Unscrew the mounting bracket of the card you want to remove 4 Grasp the card by its outside corners and ease it out of its connector 5 If you are removing the card permanently install a metal filler bracket over the empty card slot opening Y NOTE Installing filler brackets over empty card slot openings is necessary to maintain Federal Communications Commission FCC certification of the system The brackets also keep dust and dirt out of your computer 6 Replace the computer cover and reconnect your computer and peripherals to their power sources and turn them on Y NOTE After you remove and replace the cover the chassis intrusion detector will cause the following message to be displayed at the next system start up ALERT Cover was previously removed 7 To reset the chassis intrusion detector enter System S
25. e see Figure 18 Check all connectors to be certain that they are properly cabled and firmly seated 8 Connect one of the device connectors on the EIDE cable to the 40 pin interface connector on the back of the hard disk drive NOTICE You must match the colored strip on the EIDE cable with pin 1 on the drive s interface connector to avoid possible damage to your system NOTE Ultra ATA 66 hard disk drives require an 80 conductor cable to transfer data at full speed The 80 conductor cable has a 40 pin connector just like the Ultra ATA 33 cable but has twice as many wires within the cable itself If you use an Ultra ATA 33 cable with Ultra ATA 66 hard disk drives the drives will transfer data at Ultra ATA 33 speeds Figure 18 Attaching Hard Disk Drive Cables 1 EIDE cable 2 Power input connector 3 Interface connector 4 DC power cable 9 If it is not already connected connect the other end of the EIDE cable to the IDE1 connector on the system board NOTICE You must match the colored strip on the EIDE cable with pin 1 on the IDE1 connector to avoid possible damage to your system 10 Replace the computer cover and the front panel Then reconnect your computer and peripherals to their power sources and turn them on 11 If the drive you just installed is the primary drive insert a bootable diskette into drive A 12 Enter System Setup and update Primary Drive 0 or Primary Drive 1 After you update the System Setup settings reboo
26. e IDE1 connector to avoid possible damage to your system Replace the computer cover Then reconnect your computer and peripherals to their power sources and turn them on If the drive you just installed is the primary drive insert a bootable diskette into drive A Enter System Setup and update Primary Drive 0 or Primary Drive 1 After you update the System Setup settings reboot the system Partition and logically format your drive before proceeding to the next step See the documentation for your operating system for instructions 15 Test the hard disk drive by running the Dell Diagnostics See the online System User s Guide for more information 16 If the drive you just installed is the primary drive install your operating system on the hard disk drive Refer to the documentation that came with your operating system Power Supply To access some components on the system board you may have to rotate the system power supply out of the way To rotate the power supply perform the following steps CAUTION Before you remove the computer cover see Precautionary Measures 1 Remove the computer cover as instructed in Computer Cover 2 Disconnect the AC power cable from the AC power receptacle on the back of the power supply see Figure 20 Figure 20 Rotating the Power Supply 1 Securing tab 2 Power supply 3 Release latch 3 Free the power supply by pressing the securing tab labeled RELEASE and rotate it up
27. e drive you removed you may have to update your system configuration information in System Setup See the online User s Guide for more information For a diskette drive update Diskette Drive A or Diskette Drive B to reflect the size and capacity of your new diskette drive For EIDE CD ROM and tape drives set the appropriate Secondary Drive 0 or Secondary Drive 1 to Auto Verify that your system works correctly by running the Dell Diagnostics see the online System User s Guide for more information Y NOTE Tape drives sold by Dell come with their own operating software and documentation After you install a tape drive refer to the documentation that came with the drive for instructions on installing and using the tape drive software Hard Disk Drive Removal A CAUTION Before you remove the computer cover see Precautionary Measures 1 Remove the computer cover 2 Remove the front panel as instructed in Front Panel 3 Disconnect the DC power cable and EIDE or small computer system interface SCSI cable from the drive 4 Pull the drive door forward and down until the hard disk drive bracket is ejected halfway out of the chassis See Figure 15 5 Grasp the bracket and pull it completely out of the chassis Figure 15 Hard Disk Drive Bracket Removal 1 Hard disk drive bracket 2 Hinge tabs 3 Drive door handle 4 Drive door Hard Disk Drive Installation To install a hard disk drive perform the following steps 4 CAUTI
28. e the system board perform the following steps 4 CAUTION Before you remove the computer cover see Precautionary Measures Y NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby 10 11 12 13 power LED on the system board has turned off For the location of this LED see Figure 28 Remove the computer cover Disconnect all cables from their connectors at the back of the computer Rotate the system power supply Disconnect all cables from the system board Remove the RIMMs Remove the airflow shroud the primary processor and the secondary processor or terminal card Remove the AGP card brace and the AGP video card Slide all externally accessible drives and brackets partially out of the chassis Slide the hard disk drive bracket partially out of the chassis Remove the microprocessor cooling fan Remove the screw that secures the system board to the bottom of the chassis Slide the system board toward the front of the chassis until it stops Carefully raise the front of the system board and lift the board out of the chassis at an angle To replace the system board perform the following steps 1 2 Carefully replace the system board in the chassis by performing steps 11 through 13 of the removal process in reverse Push down near each slot to engage the grounding clip onto its corresponding tab Push evenly on both sides of the s
29. ectly identifies the installed processor s 7 While in System Setup select System Security and reset Chassis Intrusion to Enabled or Enabled Silent Y NOTE If a setup password has been assigned by someone else contact your network administrator for information on resetting the chassis intrusion detector 8 Run the Dell Diagnostics to verify that the new microprocessor is operating correctly Cooling Fan Figure 28 Cooling Fan Removal 1 Fan power cable 2 Fan 3 Plastic locking tab To remove the cooling fan perform the following steps CAUTION Before you remove the computer cover see Precautionary Measures 1 Remove the computer cover 2 Rotate the power supply 3 Squeeze in on the two pairs of tabs on the airflow shroud and lift it away 4 Disconnect the fan power cable from the FAN_SYS connector see Figure 22 for location 5 Gently pull on the plastic locking tab and slide the fan toward the power supply to disengage the four latching tabs holding the fan to the back of the chassis see Figure 28 Battery Figure 29 Battery Removal 1 Battery 2 Socket NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 22 A CAUTION There is a danger of the new battery exploding if it is incorrectly installed Replace the battery only with the sa
30. efore you remove the computer cover see Precautionary Measures 1 Unpack the replacement drive and prepare it for installation NOTICE Ground yourself by either wearing a wrist grounding strap or by touching an unpainted metal surface on the computer chassis Check the documentation that accompanied the drive to verify that the drive is configured for your computer system Change any settings necessary for your configuration If you are installing an enhanced integrated drive electronics EIDE drive configure the drive for the Cable Select setting as described in the documentation that accompanied your drive Remove the computer cover if it is not already off Remove the front panel if it is not already off Attach the new drive to the drive bracket Turn the drive upside down and locate the four screw holes around its perimeter Fit the bracket over the drive and then tilt the front of the drive up so that the bracket drops down into place To ensure proper installation all screw holes should be aligned and the tabs on the front of the bracket should be flush with the front of the drive see Figure 13 To further ensure proper positioning of the drive in the chassis insert and tighten all four screws in the order in which the holes are numbered the holes are marked 1 through 4 on the bracket bottom Slide the new drive into the drive bay until the drive snaps securely into place See Figure 13 Make sure that both br
31. en repeat steps 3 4 and 5 7 Reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled Silent Y NOTE If a setup password has been assigned by someone else contact your network administrator for information on resetting the chassis intrusion detector 8 When the System Memory total is correct press lt Esc gt to exit System Setup 9 Run the Dell Diagnostics to verify that the RIMMs are operating properly Microprocessor Heat Sink Assembly To replace a microprocessor perform the following steps NOTE Dell recommends that only a technically knowledgeable person perform this procedure 2 CAUTION Before you remove the computer cover see Precautionary Measures NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 28 1 Remove the computer cover 2 Rotate the power supply 3 Remove the existing microprocessor from its connector Squeeze in on the two pairs of tabs on the airflow shroud and lift it away Press outward on the guide bracket tabs to release them from the processor heat sink assembly Remove the two thumbscrews Then pull the processor heat sink assembly out of its connector see Figure 32 You must use up to 15 Ib of force to disengage the processor from the connector Figure 32 Microprocessor Removal 1
32. es not match the existing system configuration information and generates the following message The amount of system memory has changed Strike the F1 key to continue F2 to run the setup utility 5 Press lt F2 gt to enter System Setup and check the value for System Memory The system should have already changed the value of System Memory to reflect the newly installed memory Verify the new total If it is correct skip to step 7 6 Ifthe memory total is incorrect turn off and disconnect your computer and peripherals from their electrical outlets Remove the computer cover rotate the power supply and check the installed RIMMs to make sure that they are seated properly in their sockets Then repeat steps 3 4 and 5 7 Reset the chassis intrusion detector by entering System Setup selecting System Security and changing Chassis Intrusion to Enabled or Enabled Silent NOTE If a setup password has been assigned by someone else contact your network administrator for information on resetting the chassis intrusion detector 8 When the System Memory total is correct press lt Esc gt to exit System Setup 9 Run the Dell Diagnostics to verify that the RIMMs are operating properly Microprocessor Heat Sink Assembly To replace a microprocessor perform the following steps A CAUTION The microprocessors can get extremely hot during system operation To avoid dangerous burns be sure that the microprocessors have had sufficient ti
33. etup select System Security and reset Chassis Intrusion to Enabled or Enabled Silent X NOTE If a setup password has been assigned by someone else contact your network administrator for information on resetting the chassis intrusion detector Expansion Card Guide Figure 8 Expansion Card Guide Removal Yoel 1 Left tabs 2 2 Right tabs 2 1 To remove the expansion card guide perform the following steps 1 Remove the hard disk drive bracket 2 Face the computer from the front From the outside of the chassis press in with your fingers on the two tabs on the left side of the expansion card guide see Figure 8 This will release the left tabs of the card guide from the chassis 3 Rotate the released side of the card guide away from the chassis The left side of the card guide will swing away from the chassis With the left side of the card guide away from the chassis you can then pull the card guide back and out of the chassis which releases the two right tabs Control Panel Figure 9 Control Panel Removal 1 Thermal sensor cable 2 Control panel cable 3 Screw 4 Speaker cable 5 Chassis intrusion switch cable 6 Control panel 7 Alignment hole 8 Guide pin 4 CAUTION Before you remove the computer cover see Precautionary Measures To remove the control panel perform the following steps 1 Disconnect the control panel cable from the PANEL connector on the system board see Figure 22 for the loc
34. fety and to prevent damage to the system from electrostatic discharge ESD A CAUTION FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the system perform the following steps in the sequence listed 1 Turn off the computer and all peripherals 2 Disconnect the computer and peripherals from their AC power sources Also disconnect any telephone or telecommunication lines from the computer Doing so reduces the potential for personal injury or shock 3 If you are disconnecting a peripheral from the computer or are removing a component from the system board wait 10 to 20 seconds after disconnecting the computer from AC power before disconnecting the peripheral or removing the component to avoid possible damage to the system board 4 Wear a wrist grounding strap and clip it to an unpainted metal surface such as the padlock loop on the back of the chassis If a wrist grounding strap is not available touch any unpainted metal surface on the back of the computer or on the computer chassis such as the power supply to discharge any static charge from your body before touching anything inside the computer While you work periodically touch an unpainted metal surface on the computer chassis to dissipate any static electricity that might harm internal components Also avoid touching components or contacts on a card and avoid touching pins on a chip 5 Verify that the standby power light emitting diode LED on
35. fore you remove the computer cover see Precautionary Measures 1 Remove the computer cover according to the instructions in Computer Cover 2 Rotate the power supply 3 Remove the expansion card guide and fan 4 Squeeze the tabs on the end of the fan bracket and slide the fan off of the expansion card guide see Figure 24 Control Panel Figure 25 Control Panel Removal 1 Control panel 2 Thermal cable connector 3 Control panel cable 4 Screw 5 Speaker cable connector 6 Chassis intrusion switch cable connector 7 Chassis intrusion switch 8 Hard disk drive cage door To remove the control panel perform the following steps 1 Disconnect the control panel cable from the PANEL connector on the system board see Figure 28 for the location of the PANEL connector 2 Remove the mounting screw that secures the control panel to the hard disk drive cage door 3 Disconnect the chassis intrusion switch cable connector from the control panel 4 Disconnect the thermal cable connector from the control panel 5 Disconnect the speaker cable connector from the control panel 6 Remove the control panel from the chassis Chassis Intrusion Switch Figure 26 Chassis Intrusion Switch Removal 1 Chassis intrusion cable connector 2 Control panel chassis intrusion connector 3 Enlarged hole for cable 4 Switch slot 5 Chassis intrusion switch CAUTION Before you remove the computer cover see Precautionary Measures
36. from the chassis Figure 12 Diskette Drive Removal 1 Retaining tab release button 5 Remove the screw securing the diskette drive to the bracket see Figure 13 Figure 13 3 5 Inch Drive Bracket 1 3 5 inch diskette drive 2 Retaining tabs 2 3 Bracket 4 Screw 6 Rotate the left side of the diskette drive up until the drive is clear of the retaining tabs When you replace the 3 5 inch diskette drive on the bracket be sure that the two retaining tabs on the right side of the bracket engage the mounting holes in the side of the 3 5 inch diskette drive Then replace the screw that holds the diskette drive to the bracket To replace the 3 5 inch diskette drive bracket assembly in the chassis slide the bracket tabs into the guides on the chassis until the bracket snaps into place Reconnect the DC power and interface cables 5 25 Inch Diskette LS 120 SuperDisk Tape or CD ROM Drive Removal To remove a diskette LS 120 SuperDisk tape or CD ROM drive perform the following steps 1 Remove the computer cover 2 Disconnect the DC power cable and data cable from the back of the drive 3 Squeeze the metal tabs that extend from each side of the drive bracket toward each other 4 Pull the bracket out of the bay see Figure 14 Figure 14 5 25 Inch Drive Removal 1 Bracket tabs 2 5 Turn the drive bracket assembly upside down and remove the four screws that secure the drive to the bracket see Figure 15 NOTE For e
37. ge to be displayed at the next system start up ALERT Cover was previously removed 2 To reset the chassis intrusion detector enter System Setup select System Security and reset Chassis Intrusion to Enabled or Enabled Silent Y NOTE If a setup password has been assigned by someone else contact the network administrator for information on resetting the chassis intrusion detector Computer Cover Figure 1 Padlock Ring Release 1 Security cable slot 2 Padlock ring To remove the mini tower chassis computer cover perform the following steps 1 Turn off your computer and peripherals and observe the Caution for Your Personal Safety and Protection of the Equipment described in Precautionary Measures 2 If you have installed a padlock through the padlock ring on the back panel remove the padlock and facing the back of the computer slide the padlock ring to the left to unlock the cover release mechanism see Figure 1 3 Face the left side cover and press the release button located at the bottom left corner of the front panel see Figure 2 Figure 2 Computer Cover Removal 4 5 1 Release button We a Al Lift the bottom of the cover allowing it to pivot up toward you Disengage the tabs that secure the cover to the top of the chassis and lift the cover away Figure 3 Computer Cover Replacement 1 Hook 3 2 Recessed slot 3 To replace the computer cover perform the following steps
38. icroprocessor Cooling Fan Removal 1 Fan power cable 2 Fan 3 Plastic locking tab 4 Latching tabs 4 To remove a microprocessor cooling fan perform the following steps 4 CAUTION Before you remove the computer cover see Precautionary Measures Remove the computer cover according to the instructions in Computer Cover Rotate the power supply Remove the airflow shroud by squeezing in on the two pairs of tabs on the shroud and lift it away Remove the fan power cable from its connector see Figure 28 for the location of the system FAN connector Gently pull the plastic locking tab and push down on the fan to disengage the four latching tabs holding the fan to the back of the chassis Pull the fan forward toward the microprocessor slots to remove it Battery Figure 35 Battery Removal 1 Battery 2 Socket A CAUTION There is a danger of the new battery exploding if it is incorrectly installed Replace the battery only with the same or equivalent type recommended by the manufacturer Discard used batteries according to the manufacturer s instructions CAUTION Before you remove the computer cover see Precautionary Measures X NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 28 To remove the system battery perform the following steps 1 If po
39. inch front panel insert perform the following steps 1 Hold the front panel with the front facing you 2 From the front of the front panel use your thumbs to press inward on the insert until it snaps free of the cover To replace a 5 25 inch front panel insert position the two ring tabs over the posts on the inside of the bay opening and then press the ring tabs over the posts Drives 4 CAUTION Before you remove the computer cover see Precautionary Measures NOTE In all of the following procedures left and right refer to your left and right as you face the front of the computer Figure 8 Drive Locations 1 3 5 inch diskette drive 2 5 25 inch drive bays 3 3 Hard disk drive Diskette Drive Removal To remove the 3 5 inch diskette drive assembly perform the following steps 1 Disconnect the DC power interface cables from the back of the diskette drive Note the routing of the DC power interface cables through the chassis as you disconnect them It is important to route the cables properly when you replace them to prevent the cables from being pinched or crimped 2 Press the retaining tab release button see Figure 9 and pull the diskette drive assembly forward to remove it from the chassis 3 Remove the screw securing the diskette drive to the bracket see Figure 10 4 Rotate the left side of the diskette drive up until the drive is clear of the retaining tabs When you replace the 3 5 inch diskette drive on the brac
40. ket be sure that the two retaining tabs on the right side of the bracket engage the mounting holes in the side of the 3 5 inch diskette drive bracket Then replace the screw that holds the diskette drive to the bracket To replace the 3 5 inch diskette drive assembly in the chassis slide the bracket tabs into the guides on the chassis until the bracket snaps into place Reconnect the DC power interface cables Figure 9 Diskette Drive Removal 1 Retaining tab release button Figure 10 3 5 Inch Diskette Drive Bracket 1 3 5 inch diskette drive 2 Retaining tabs 2 3 Bracket 4 Screw 5 25 Inch Diskette LS 120 SuperDisk Tape or CD ROM Drive Removal To remove a diskette LS 120 SuperDisk tape or CD ROM drive perform the following steps 1 Remove the computer cover 2 Disconnect the DC power cable and interface cable from the back of the drive 3 Squeeze the metal tabs that extend from each side of the drive bracket toward each other 4 Pull the bracket out of the bay see Figure 11 5 Turn the drive bracket assembly upside down and unscrew the four screws that secure the drive to the bracket see Figure 12 Figure 11 5 25 Inch Drive Removal 1 Bracket tabs 2 Figure 12 5 25 Inch Drive Bracket 1 Metal tab 2 Drive bracket 3 Screws 4 5 25 Inch Diskette Tape or CD ROM Drive Replacement To install a replacement 5 25 inch diskette tape or CD ROM drive perform the following steps 4 CAUTION B
41. me or equivalent type recommended by the manufacturer Discard used batteries according to the manufacturer s instructions CAUTION Before you remove the computer cover see Precautionary Measures To remove the system battery perform the following steps 1 If possible enter System Setup and print the System Setup screens If the settings are lost while you are replacing the battery you can refer to your written or printed cop of the system configuration information to restore the correct settings To access the battery on the system board rotate the power supply as described in Rotating the Power Supply If installed remove the CD ROM drive according to the instructions in Diskette LS 120 SuperDisk Tape or CD ROM Drive Removal to access the battery Locate the battery and remove it The battery is mounted in a socket labeled BATTERY at the upper front right corner of the system board as you face the side of the system see Figure 22 NOTICE If you pry the battery out of its socket with a blunt object be careful not to touch the system board with the object Make certain 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 circuit traces on the system board Remove the system battery by carefully prying it out of its socket with your fingers or with a blunt nonconducting obje
42. me to cool before you touch them CAUTION To avoid the possibility of electric shock turn off the computer and any peripherals disconnect them from their electrical outlets and then wait at least 5 seconds before you remove the computer cover X NOTE Dell recommends that only a technically knowledgeable person perform this procedure 4 CAUTION Before you remove the computer cover see Precautionary Measures TX NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 22 1 Remove the computer cover according to the instructions in Computer Cover 2 Rotate the power supply as described in Power Supply 3 Remove the existing microprocessor from its connector a Squeeze in on the two pairs of tabs on the airflow shroud and lift it away b Unscrew and remove the two large thumbscrews that secure the heat sink to the system board c Press outward on the guide bracket release latches d Grasp the processor heat sink assembly firmly and pull it away from the guide bracket assembly assembly see Figure 26 You must use up to 15 pounds of force to disengage the processor from the connector Figure 26 Microprocessor Removal 1 Airflow shroud 2 Thumbscrews 2 3 Processor heat sink assembly 4 Guide bracket 5 Second processor Figure 27 Microprocessor Replacement D 1
43. nector Suspend To RAM LED Jumper block see System Board Jumpers System board screw LVD SCSI connector Primary EIDE connector Standby power LED O AN OO oO F Q N mmm ao Ff WO N SO Control panel connector oe MT power 2 connector mini tower chassis h MT power 1 connector mini tower chassis Modem TAPI connector ok O Card cage fan power connector N O Auxiliary sound input connector N l PCI RAID expansion card connector 22 Auxiliary hard disk drive access LED connector 23 PCI expansion slots 24 AGP graphics slot 25 Remote wakeup on LAN connector 26 Primary processor 0 socket 27 Network cable connector 28 Diagnostic LEDs 29 USB connectors 30 Secondary processor 1 socket 31 Line in connector 32 Line out connector 33 Microphone Connector 34 Mouse keyboard stacked 35 System fan power connector 36 Serial port 1 serial port 2 stacked 37 Parallel port external SCSI port stacked System Board Jumpers Figure 23 shows the location of the jumpers on the system board Table 1 lists the system board jumpers and their settings Figure 23 System Board Jumpers PSWD RTCRST Jumpers are small blocks on a circuit board with two or more pins emerging from them Plastic plugs containing a wire fit down over the pins The wire connects the pins and creates a circuit NOTICE Make sure your system is turned off before you change a jumper setting Otherwise dam
44. o avoid the possibility of electric shock turn off the computer and any peripherals disconnect them from their electrical outlets and then wait at least 5 seconds before you remove the computer cover Also before you replace memory see the other precautions in Precautionary Measures 1 Remove the computer cover 2 If necessary remove any RIMMs that occupy sockets in which you plan to install the replacement RIMMs X NOTES If you are not installing a replacement RIMM at this time you MUST remove the remaining RIMM in the pair and install a pair of continuity modules CRIMM When operating with a single pair of RIMMs they MUST occupy sockets RIMMB 1 and RIMMA 2 with CRIMMs installed in RIMMB 3 and RIMMA 4 3 Install the RIMMs a Locate the plastic securing clips at each end of the socket see Figure 25 b Press the clips outward until they snap open Press the RIMM straight into the slot running down the center of the socket until the securing tabs snap into place around the ends of the RIMM Figure 25 RIMM Installation 1 Securing clips 2 2 Notches 2 4 Replace the computer cover and reconnect your computer and peripherals to their electrical outlets and turn them on X NOTE After you remove and replace the cover the chassis intrusion detector causes the following message to appear on the screen at the next system start up ALERT Cover was previously removed The system detects that the new memory do
45. place the cover the chassis intrusion detector will cause the following message to be displayed at the next system start up ALERT Cover was previously removed 6 To reset the chassis intrusion detector enter System Setup select System Security and reset Chassis Intrusion to Enabled or Enabled Silent Drives NOTE In all of the following procedures left and right refer to your left and right as you face the front of the computer Figure 11 Drive Locations 1 Hard disk drives 2 5 25 inch drives CD ROM drive shown 3 3 5 inch diskette drive Diskette Drive Removal 4 CAUTION Before you remove the computer cover see Precautionary Measures To remove the 3 5 inch diskette drive assembly perform the following steps 1 Rotate the system power supply up and out of the system see Figure 20 2 Disconnect the DC power cable from the back of the diskette drive 3 Disconnect the interface ribbon cable from the back of the diskette drive The other end of this ribbon cable is connected to the DISKETTE connector on the system board see Figure 22 for the location of the DISKETTE connector Note the routing of the DC power and interface ribbon cables through the chassis as you disconnect them It is important to route the cables properly when you replace them to prevent them from being pinched or crimped 4 Press down on the retaining tab release button see Figure 12 and pull the drive assembly forward to remove it
46. plastic card guide on the bottom of the card brace spring engages the AGP card 3 Slide the card brace toward the back of the system until the tab at the end engages the slot in the chassis Replace the screw that secures the AGP card brace to the chassis see Figure 19 Expansion Cards The Dell Precision 420 systems provide five 32 bit Peripheral Component Interconnect PCI expansion card slots Slot 5 is shared with the RAID port function The system contains five 32 bit expansion slots and a 32 bit AGP Pro 110 4X slot If you use an AGP Pro 50 or Pro110 card it occupies the AGP slot and may occupy PCI slots 1 and 2 See Figure 20 for examples of these cards Industry standard architecture ISA expansion cads are not supported in this system NOTE Before disconnecting a peripheral from the system or removing a component from the system board verify that the standby power LED on the system board has turned off For the location of this LED see Figure 28 Figure 20 Expansion Cards 1 32 bit PCI expansion card 2 32 bit AGP card Figure 21 AGP Pro110 Card Extension Figure 21 shows the AGP card extension that occludes PCI slots 1 and 2 The following is a list of valid expansion card combinations One AGP card and five PCI cards One AGP card four PCI cards and one RAID card One AGP Pro50 card and four PCI cards One AGP Pro50 card three PCI cards and one RAID card One AGP Pro110 card and three PC
47. ps 4 CAUTION Before you remove the computer cover see Precautionary Measures 1 6 If you are replacing a hard disk drive that contains data you want to keep be sure you have a backup of your files before you begin this procedure Prepare the replacement drive for installation NOTICE Wear a wrist grounding strap or ground yourself by touching an unpainted metal surface on the back of the computer NOTICE When you unpack the drive do not set it on a hard surface which may damage the drive Instead set the drive on a surface such as a foam pad that will sufficiently cushion it Check the documentation for the drive to verify that it is configured for your computer system Remove the computer cover as instructed in Computer Cover Remove the drive bracket from the chassis as instructed in Hard Disk Drive Bracket Removal Slide the drive into the chosen bay of the bracket oriented so that the connectors on the back of the drive will face the back of the chassis when the bracket is reinstalled see Figure 16 Align the four screw holes of the drive and bracket Insert and tighten the screws see Figure 17 Figure 17 Installing a Hard Disk Drive in the Bracket 2 iS 1 Screws 4 sic 2 Drive bracket 3 Drive 7 Reinstall the hard disk drive bracket in the chassis See Figure 18 Install the bracket into the chassis by inserting the hooks in the slots on the front of the chassis Then lower the bracket
48. rest in trademarks and trade names other than its own Initial release 30 Nov 1999 Back to Contents Page Desktop Chassis Removing and Replacing Parts Dell Precision WorkStation 420 Systems Service Manual Overniew Control Panel Recommended Tools Chassis Intrusion Switch e Precautionary Measures S Drives Restarting the System Power Supply Computer Cover System Board Components Interior Service Label RIMMs J Internal View E Microprocessor Heat Sink Assembly Front Panel Inserts Cooling Fan Expansion Cards Battery Expansion Card Guide System Board Overview This section provides procedures for removing and replacing the components assemblies and subassemblies in the Dell Precision WorkStation 420 desktop chassis system Unless otherwise noted each procedure assumes that the following conditions exist You have performed the steps in Precautionary Measures 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 file require the use of one or more of the following tools 2 Phillips head screwdriver A wrist grounding strap as explained in Precautionary Measures Precautionary Measures Before you perform any procedure in this section take a few moments to read the following caution for your personal sa
49. so reduces the potential for personal injury or shock 3 If you are disconnecting a peripheral from the computer or are removing a component from the system board wait 10 to 20 seconds after disconnecting the computer from AC power before disconnecting the peripheral or removing the component to avoid possible damage to the system board 4 Wear a wrist grounding strap and clip it to an unpainted metal surface such as the padlock loop on the back of the chassis If a wrist grounding strap is not available touch any unpainted metal surface on the back of the computer or on the computer chassis such as the power supply to discharge any static charge from your body before touching anything inside the computer While you work periodically touch an unpainted metal surface on the computer chassis to dissipate any static electricity that might harm internal components Also avoid touching components or contacts on a card and avoid touching pins on a chip 5 Verify that the standby power light emitting diode LED on the system board is not on If it is on you may need to wait 10 to 30 seconds for it to go out See Figure 28 Restarting the System To restart the system and reset the chassis intrusion detector perform the following steps 1 Replace the computer cover and reconnect the computer and peripherals to their power sources and turn them on Y NOTE When you start the system the chassis intrusion detector will cause the following messa
50. ssible enter System Setup and print the System Setup screens If the settings are lost while you are replacing the battery you can refer to your written or printed cop of the system configuration information to restore the correct settings 2 To access the battery on the system board rotate the power supply as described in Rotating the Power Supply 3 If installed remove the CD ROM drive according to the instructions in Diskette LS 120 SuperDisk Tape or CD ROM Drive Removal to access the battery 4 Locate the battery and remove it The battery is mounted in a socket labeled BATTERY at the upper front right corner of the system board as you face the side of the system see Figure 28 NOTICE If you pry the battery out of its socket with a blunt object be careful not to touch the system board with the object Make certain 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 circuit traces on the system board 5 Remove the system battery by carefully prying it out of its socket with your fingers or with a blunt nonconducting object such as a plastic screwdriver When you replace the system battery orient the new battery with the facing up Insert the battery into its socket and snap it into place System Board Figure 36 System Board Removal 1 System board 2 Screw To remov
51. t the system 13 Partition and logically format your drive before proceeding to the next step See the documentation for your operating system for instructions 14 Test the hard disk drive by running the Dell Diagnostics see the online System User s Guide for more information 15 If the drive you just installed is the primary drive install your operating system on the hard disk drive Refer to the documentation that came with your operating system AGP Card Brace To access any expansion cards and components on the system board you must first remove the accelerated graphics port AGP card brace that secures an AGP card in the AGP socket A CAUTION Before you remove the computer cover see Precautionary Measures 1 Remove the computer cover 2 Remove the screw securing the AGP card brace through the AGP expansion card s mounting bracket to the back of the chassis see Figure 19 Figure 19 AGP Card Brace Removal Card guide front of chassis AGP card brace Card brace spring Screw Plastic card guide Slot Tab on AGP card brace N oF FF OO N 3 Slide the card brace forward until it disengages from the slot in the card guide then rotate the brace up and lift it away from the chassis To replace the card brace perform the following steps 1 Insert the tab on the end of the card brace into the slot above the card guide at the front of the chassis see Figure 19 2 Lower the card brace ensuring that the
52. to the bottom of the chassis making sure that the latch on the drive bay is engaged Replace the screw holding the drive bracket to the drive bay Figure 18 Installing the Drive Bracket in the Chassis 1 Screw 2 Hooks 3 3 Drive bracket 4 Latch 8 Connect a DC power cable to the power input connector on the back of the drive see Figure 19 Check all connectors to be certain that they are properly cabled and firmly seated 9 Connect one of the device connectors on the EIDE cable to the 40 pin interface connector on the back of the hard disk drive NOTICE You must match the colored strip on the EIDE cable with pin 1 on the drive s interface connector to avoid possible damage to your system NOTE Ultra ATA 66 hard disk drives require an 80 conductor cable to transfer data at full speed The 80 conductor cable has a 40 pin connector just like the Ultra ATA 33 cable but has twice as many wires within the cable itself If you use an Ultra ATA 33 cable with Ultra ATA 66 hard disk drives the drives will transfer data at Ultra ATA 33 speeds Figure 19 Attaching Hard Disk Drive Cables 10 11 12 13 14 DC power cable Power input connector on drive Interface connector on drive EIDE cable IDE1 connector ao Ff WS N If it is not already connected connect the other end of the EIDE cable to the IDE1 connector on the system board NOTICE You must match the colored strip on the EIDE cable with pin 1 on th
53. ward to a vertical position See Figure 20 To remove the power supply perform the following steps CAUTION Before you remove the computer cover see Precautionary Measures Figure 21 Removing the Power Supply 1 Power supply 2 Slot 1 Remove the computer cover as instructed in Computer Cover 2 Disconnect the AC power cable from the AC power receptacle on the back of the power supply 3 Disconnect the DC power cables that attach to the diskette drive any installed 5 25 inch drives and hard disk drives mounted in the internally accessible drive bracket 4 Rotate the power supply up and out of the way of the system board see Figure 20 5 Disconnect the power supply connectors from the POWER_1 and POWER_2 connectors on the system board 6 Carefully fold the DC power supply cables you have disconnected and place them outside the chassis 7 With the power supply in its rotated position up and away from the system board and chassis lift up on the front end of the power supply and then move that end of the power supply out away from the chassis see Figure 21 System Board Components Figure 22 shows the system board and the location of all its sockets and connectors Figure 22 System Board Components CD ROM drive audio connector Main power 1 connector desktop chassis Diskette connector Main power 2 connector desktop chassis Battery RIMM memory sockets SCSI narrow connector Secondary EIDE con
54. y accessible drive bays Hard disk drive cage Chassis intrusion switch 4 Power supply 5 Hard disk drive interface cable 6 DC power cable 7 AGP card brace 8 Security cable slot 9 Padlock ring 11 12 AC power receptacle Expansion card slots I O panel connectors To access some drive bays in the mini tower chassis you must first remove the front panel To remove the front panel you first must remove the computer cover see Computer Cover With the cover removed release the panel by pressing the green tab release marked with the icon see Figure 6 Figure 6 Front Panel Removal 1 Tab release 2 Retaining hooks 2 y yj iff To remove the front panel perform the following steps 1 While pressing the tab release marked with the icon tilt the panel away from the chassis 2 Disengage the two retaining hooks at the bottom of the panel 3 Carefully pull the panel away from the chassis To replace the front panel perform the following steps 1 Fit the two retaining hooks on the panel into their corresponding slots at the bottom of the mini tower chassis See Figure 6 2 Rotate the top of the panel toward the chassis until the tabs on the top of the chassis snap into their corresponding slots on the panel Front Panel Inserts Figure 7 Front Panel Insert Removal 1 Front panel 2 Posts 2 3 Ring tabs 2 4 Front panel insert To remove a 5 25
55. ystem board as you slide and lock it into position do not twist the system board Reinstall the mounting screw Reinstall all components on the system board by performing steps 4 through 10 of the removal process in reverse Set the jumpers on the new system board so that they are identical to those on the old board unless you are installing a microprocessor upgrade Replace the computer cover connect cables and turn on the power Run the System Setup program to ensure that your settings are correct and all system board components are correctly reported Run the Dell Diagnostics Back to Contents Page

Dell 420 Personal Computer User Manual

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