Instruction/ maintenance manual of the product 420 Dell
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DellPrecision™WorkStation420SystemsServiceManual Desktop Chassis — Removing and Replacing Parts Mini Tower Chassis — Removing and Replacing Parts NOTE: You can obtain the latest version of this document from the Support section of the Dell Web site at http://www.
Back to Contents Page Desktop Chassis — RemovingandReplacingParts:DellPrecision™WorkStation420 Systems Service Manual Overview This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell Precision WorkStation 420 desktop chassis system.
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. ALERT! Cover was previously removed.
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.
Front - Panel Inserts Figure5.5.25 - Inch Front - Panel Insert Removal 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.
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: l One AGP card and five PCI card.
Expansion - Card Guide Figure 8. Expansion - Card Guide Removal To remove the expansion - card guide, perform the following steps: 1. Remove the hard - disk drive bracket .
1. Disconnect the control panel cable from the PANEL connector on the system board (see Figure 22 for the location 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.
Figure 11. Drive Locations Diskette Drive Removal 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.
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.
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.
1. 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. 2. Remove the hard - disk drive. Hard - Disk Drive Replacement To install a replacement hard - disk drive, perform the following steps.
8. Connect a DC power cable to the power input connector on the back of the drive (see Figure19 ). 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.
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.
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.
System Board Jumpers Figure 23 shows the location of the jumpers on the system board. Table1 lists the system board jumpers and their settings. Figure 23. System Board Jumper s Jumpers are small blocks on a circuit board with two or more pins emerging from them.
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.
To remove a Rambus in - line memory module (RIMM), perform the following steps. 1. Remove the computer cover . 2. PressthesecuringclipsoutwardsimultaneouslyuntiltheRIMMdisengagesandpopsoutslightlyfromthesocket(seeFigure24).
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 F1 key to continue, F2 to run the setup utility 5. Press <F2> to enter System Setup, and check the value for System Memory .
Figure 27. Microprocessor Replacement 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). 1. Press the processor firmly into its connector until it is fully seated.
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. 6. Enter System Setup and confirm that the top line in the System Data area correctly identifies the installed processor(s).
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.
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 .
Back to Contents Page Mini Tower Chassis — RemovingandReplacingParts:DellPrecision™WorkStation 420 Systems Service Manual Overview This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell Precision WorkStation 420 mini tower chassis system.
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. ALERT! Cover was previously removed.
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. Figure 3. Computer Cover Replacement To replace the computer cover, perform the following steps: 1.
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.
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.
Drives Figure 8. Drive Locations 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.
Figure 10. 3.5 - Inch Diskette Drive Bracket 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.
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.
7. Connect a DC power cable to the power input connector on the back of the drive (see Figure 14 ). 8. Connect the appropriate interface cable to the interface connector on the back of the drive (see Figure14 ). If your system came with an EIDE CD - ROM or tape drive, use the spare connector on the existing interface cable.
Hard - Disk Drive Removal 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.
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.
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.
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 ).
Figure 21 shows the AGP card extension that occludes PCI slots 1 and 2. The following is a list of valid expansion - card combinations: l One AGP card and five PCI cards l One AGP card, four PCI cards.
Figure 22. Installing an Expansion Card 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.
To remove an expansion - card guide cooling fan, perform the following steps. 1. Remove the computer cover according to the instructions in " Computer Cover .
To remove the chassis intrusion switch and install a replacement, perform the following steps: 1. Disconnectthechassisintrusionswitchcablefromthecontrolpanel(see Figure 26 ). Note the routing of the chassis intrusion cable as you remove the cable from the chassis.
4. Lift the 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.
1 CD - ROM drive audio connector 2 Main power 1 connector (desktop chassis) 3 Diskette connector 4 Main power 2 connector (desktop chassis) 5 Battery 6 RIMM (memory) sockets 7 SCSI narrow connector 8 .
System Board Jumpers Figure 29 shows the location of the jumpers on the system board. Table1 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.
RIMMs To remove a Rambus in - line memory module (RIMM), perform the following steps. 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 ).
2. If necessary, remove any RIMMs that occupy sockets in which you plan to install the RIMMs. 3. Install the RIMMs. a. Locate the plastic securing clips at each end of the socket (see Figure 31 ).
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.
Press the processor firmly into its connector until it is fully seated. You must use up to 25 lb of force to fully seat the processor in its connector. 5. Install the two thumbscrews. 6. Replace the airflow shroud. 7. Rotate the power supply back into position, making sure that the securing tab snaps into place.
Battery Figure 35. Battery Removal To remove the system battery, perform the following steps: 1. If possible, enter System Setup and print the System Setup screens. 1 Battery 2 Socket CAUTION: There is a danger of the new battery exploding if it is incorrectly installed.
To remove the system board, perform the following steps. 1. Remove the computer cover . 2. Disconnect all cables from their connectors at the back of the computer. 3. Rotate the system power supply . 4. Disconnect all cables from the system board. 5. Remove the RIMMs .
An important point after buying a device Dell 420 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Dell 420 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Dell 420 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Dell 420 you will learn all the available features of the product, as well as information on its operation. The information that you get Dell 420 will certainly help you make a decision on the purchase.
If you already are a holder of Dell 420, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Dell 420.
However, one of the most important roles played by the user manual is to help in solving problems with Dell 420. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Dell 420 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
