Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Before You Begin Recommended Tools Precautionary Measures Protecting Against Electrostatic Discharge Opening the Computer Cover Inside Your Computer — Dell Precision™ 650 Computer Inside View of Your Computer System Board Components Inside Your Computer — Dell Precision™ 450 Computer Inside View of Your Computer System Board Components Drives — Dell Precision™ 650 Computer Overview Hard Drive Floppy Drive CD/DVD Drive Drive Do
Back to Contents Page Battery Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual CAUTION: Before you begin this procedure, follow the safety instructions in the System Information Guide. A coin-cell battery maintains computer configuration, date, and time information. The battery can last several years.
Back to Contents Page Before You Begin Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Recommended Tools Precautionary Measures Protecting Against Electrostatic Discharge This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell Precision™ 450 computer and Dell Precision 650 computer.
l When transporting a sensitive component, first place it in an antistatic container or packaging. l Handle all sensitive components in a static-safe area. If possible, use antistatic floor pads and workbench pads.
Back to Contents Page Cards Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Installing a Card Removing a Card CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Your Dell™ computer provides slots for PCI/PCI-X and AGP cards. For more information, see "Specifications" in your User's Guide or the system board components illustration for your computer.
1 fully seated card 2 not fully seated card 3 bracket within slot 4 bracket caught outside of slot 6. Before you lower the retention arm, ensure that: l The tops of all cards and filler brackets are flush with the alignment bar. l The notch in the top of the card or filler bracket fits around the alignment guide. Press the arm into place, securing the card(s) in the computer. 1 filler bracket 2 alignment bar 3 alignment guide 4 retention arm 7.
1 base 2 AGP retention spring 3 indentation NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer cover from closing properly or cause damage to the equipment. 8. Connect any cables that should be attached to the card. See the documentation for the card for information about the card's cable connections. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 9. 10.
1 base 2 release tabs (2) 3 AGP retention spring 3. If necessary, disconnect any cables connected to the card. 4. Grasp the card by its top corners, and ease it out of its connector. 5. If you are removing the card permanently, install a filler bracket in the empty card-slot opening. If you need a filler bracket, contact Dell. NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the computer.
Back to Contents Page Chassis Intrusion Switch Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the Chassis Intrusion Switch Replacing the Chassis Intrusion Switch CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
Replacing the Chassis Intrusion Switch To replace the chassis intrusion switch, perform the removal procedure in reverse.
Back to Contents Page Control Panel Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Control Panel Components Removing the Control Panel Replacing the Control Panel CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
1 control panel 2 mounting screw Dell Precision 450 Computer 1 control panel 2 mounting screw Replacing the Control Panel To replace the control panel, perform the removal procedure in reverse.
Back to Contents Page Inside Your Computer — Dell Precision™ 450 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Inside View of Your Computer System Board Components CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. CAUTION: To avoid electrical shock, always unplug your computer from the electrical outlet before opening the cover.
1 CD/DVD drive connector (IDE2) 14 PCI card connectors (PCI1, PCI2 [32-bit connectors], and PCI3 [64-bit PCI-X connector]) 2 I/O panel (I/O PANEL) 15 telephony connector (MODEM) 3 floppy drive connector (DISKETTE) 16 AGP Pro card connector (AGP) 4 memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4) 17 VRM connector (VRM) (for a second microprocessor only) 5 suspend-to-RAM light (STR_LED) 18 microprocessor and heat-sink connector (CPU_1) 6 power connector (POWER 2) 19 front-panel audio
Back to Contents Page Drives — Dell Precision™ 450 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Overview Hard Drive Floppy Drive CD/DVD Drive CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
1 power cable 2 power input connector 1 interface connector 2 colored stripe on cable 3 interface cable Most interface connectors are keyed for correct insertion; that is, a notch or a missing pin on one connector matches a tab or a filled-in hole on the other connector. Keyed connectors ensure that the pin-1 wire in the cable (indicated by the colored stripe along one edge of the cable) goes to the pin-1 end of the connector.
SCSI logic requires that termination be enabled for the two devices at opposite ends of the SCSI chain and disabled for all devices in between. It is recommended that you use terminated cables and that you disable termination on all devices. See the documentation provided with any optional SCSI device you purchase for information on disabling termination on the device.
1 tabs (2) 2 hard drive Installing a Hard Drive 1. Unpack the replacement hard drive, and prepare it for installation. 2. Check the documentation for the drive to verify that it is configured for your computer. 3. If your replacement hard drive does not have the bracket rails attached, remove the rails from the old drive by removing the two screws that secure each rail to the drive.
5. If you are installing a drive that has its own controller card, install the controller card in an expansion slot. See the documentation that accompanied the drive and controller card to verify that the configuration is correct for your computer. NOTICE: Match the colored strip on the cable with pin 1 on the drive (pin 1 is marked as "1"). 6. Connect the power and hard-drive cables to the drive. 1 hard-drive cable 2 power cable 7.
See the documentation for your operating system for instructions. 15. Test the hard drive by running the Dell Diagnostics. 16. If the drive you just installed is the primary drive, install your operating system on the hard drive. Floppy Drive CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Removing a Floppy Drive 1. Disconnect the power and floppy-drive cables from the back of the floppy drive.
Installing a Floppy Drive 1. If you are replacing a drive and the the new drive does not have the bracket rails attached, remove the rails from the old drive by removing the two screws that secure each rail to the drive. Attach the bracket to the new drive by aligning the screw holes on the drive with the screw holes on the bracket rails and then inserting and tightening all four screws (two screws on each rail). 1 drive 2 bracket rails (2) 3 screws (4) 2.
1 power cable 2 floppy-drive cable 4. If you are installing a new floppy drive rather than replacing a drive, remove the front-panel inserts. From inside the drive bay, gently press on each side of the insert until it pops out. 5. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents. 6. Close the computer cover. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 7.
1 tabs (2) 2 CD/DVD drive Installing a CD/DVD Drive 1. If you are installing a new drive, unpack the drive and prepare it for installation. Check the documentation that accompanied the drive to verify that the drive is configured for your computer. If you are installing an IDE drive, configure the drive for the cable select setting. 2. Connect the new drive to the set of rails that are attached to the inside of the computer cover. If a set of rails is not attached inside the cover, contact Dell. 3.
5. If you are installing a drive that has its own controller card, install the controller card in an expansion slot. See the documentation that accompanied the drive and controller card to verify that the configuration is correct for your computer. 6. Connect the power and CD/DVD drive cables to the drive. If you are adding a drive that has an audio cable, connect the audio cable to the audio connector on the system board.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 10. Connect your computer and devices to electrical outlets, and turn them on. See the documentation that came with the drive for instructions on installing any software required for drive operation. 11. 12. Update your configuration information by setting the appropriate Drive option (0 or 1) under Drives: Secondary to Auto.
Back to Contents Page Power Supply — Dell Precision™ 450 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the Power Supply Replacing the Power Supply CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Removing the Power Supply NOTICE: Before disconnecting a device from the computer, wait 10 to 20 seconds after disconnecting the computer from its electrical outlet.
Back to Contents Page Drive Door — Dell Precision™ 650 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the Drive Door Replacing the Drive Door CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Removing the Drive Door 1. Open the drive door. 2. Unsnap the top hinge and pull the top of the drive door outward, away from the computer.
3. Lift the bottom hinge away from the computer. Replacing the Drive Door To replace the drive door, perform the removal procedure in reverse.
Back to Contents Page Microprocessor Airflow Shroud — Dell Precision™ 450 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the Microprocessor Airflow Shroud Installing the Microprocessor Airflow Shroud CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Removing the Microprocessor Airflow Shroud NOTICE: To avoid damaging the fan power cables, do not slide the shroud too quickly.
Back to Contents Page Card Fan and Guide — Dell Precision 650 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the Card Fan and Guide Replacing the Card Fan and Guide The Card Fan Guide Removing the Card Fan and Guide CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
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Back to Contents Page Front Panel Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the Front Panel Replacing the Front Panel CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Removing the Front Panel 1. 2. Disconnect and remove all disk drives (for more information, see "Drives — Dell Precision™ 650 Computer" or "Drives — Dell Precision™ 450 Computer.
Back to Contents Page I/O Panel Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual I/O Panel Components for the Dell Precision 650 Computer I/O Panel Components for the Dell Precision 450 Computer Removing the I/O Panel Replacing the I/O Panel CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
5 control panel connector Removing the I/O Panel 1. Remove the front panel. 2. Disconnect the control panel cable from the control panel connector. 3. Disconnect the front-panel cable from the system board. 4. Remove all cables that are connected to the front I/O panel. 5. From inside the cover, remove the mounting screw that secures the front I/O panel to the computer. 6. Remove the front I/O panel from the computer.
Back to Contents Page Inside Your Computer — Dell Precision™ 650 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Inside View of Your Computer System Board Components CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. CAUTION: To avoid electrical shock, always unplug your computer from the electrical outlet before opening the cover.
1 CD/DVD drive connector (IDE2) 15 standby power light (AUX_PWR_LED) 2 I/O panel connector (I/O PANEL) 16 PCI card connectors (PCI1, PCI2 [32-bit connectors], PCI3 , PCI4, and PCI5 [64-bit PCI-X connectors]) 3 floppy-drive connector (DISKETTE) 17 telephony connector (MODEM) 4 memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4) 18 AGP Pro card connector (AGP) 5 suspend-to-RAM light (STR_LED) 19 VRM connector (VRM)(for a second microprocessor only) 6 power connector (POWER 2) 20 micropr
Back to Contents Page Closing the Computer Cover Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual 1. Ensure that all cables are connected, and fold cables out of the way. 2. Ensure that no tools or extra parts are left inside the computer. 3. Close the computer cover: a. Pivot the cover down and into position. b. If your computer has a baffle, ensure that the baffle is correctly positioned by guiding it into place as you lower the cover. c.
5. Connect your computer and devices to electrical outlets, and turn them on.
Back to Contents Page Opening the Computer Cover Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover. 1. Lay the computer on its side as shown in the illustration.
1 security cable slot 2 cover release latch 3 padlock ring Back to Contents Page
Back to Contents Page Microprocessor Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Installation Guidelines Installing the Microprocessor Removing the Microprocessor CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Installation Guidelines l Your computer is designed for dual-processor operations. The heat sinks (CPU_0 and CPU_1) are keyed to fit their specific connector.
5 socket pin-1 indicator 6. 7. 8. 9. 10. 11. 12. Remove the thermal grease protective cover and place the heat sink in the base. Place one end of the heat sink under the tab on the retention module on the side opposite the lever. Lower the heat sink onto the microprocessor so that the heat sink fits securely under the tab on the other end of the retention module. Replace the retention module clips.
6 lever 3. Pull the release lever straight up until the microprocessor is released. NOTICE: Be careful not to bend any of the pins when you remove the microprocessor from the socket. Bending the pins can permanently damage the microprocessor. 1 release lever 2 microprocessor 3 socket 4. Remove the microprocessor from the socket.
Back to Contents Page Drives — Dell Precision™ 650 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Overview Hard Drive Floppy Drive CD/DVD Drive CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
1 power cable 2 power input connector 1 interface connector 2 colored stripe on cable 3 interface cable Most interface connectors are keyed for correct insertion; that is, a notch or a missing pin on one connector matches a tab or a filled-in hole on the other connector. Keyed connectors ensure that the pin-1 wire in the cable (indicated by the colored stripe along one edge of the cable) goes to the pin-1 end of the connector.
If you attach additional optional SCSI devices, see the documentation for each device for information about setting the appropriate SCSI ID number. NOTICE: Dell recommends that you use only SCSI cables purchased from Dell. Cables purchased elsewhere are not guaranteed to work with Dell computers. Device Termination SCSI logic requires that termination be enabled for the two devices at opposite ends of the SCSI chain and disabled for all devices in between.
1 power cable 2 hard-drive cable 3. Press in on the tabs on each side of the drive and slide the drive up and out. 1 tabs (2) 2 hard drive Installing a Hard Drive 1. Unpack the replacement hard drive, and prepare it for installation. 2. Check the documentation for the drive to verify that it is configured for your computer. 3.
1 drive 2 bracket rails (2) 3 screws (4) 4. Gently slide the drive into place until the tabs securely click into position. 5. If you are installing a drive that has its own controller card, install the controller card in an expansion slot. See the documentation that accompanied the drive and controller card to verify that the configuration is correct for your computer. NOTICE: Match the colored strip on the cable with pin 1 on the drive (pin 1 is marked as "1"). 6.
1 power cable 2 hard-drive cable 7. Check all connectors to be certain that they are properly cabled and firmly seated. 8. Close the computer cover. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 9. Connect your computer and devices to electrical outlets, and turn them on. See the documentation that came with the drive for instructions on installing any software required for drive operation. 10.
1 power cable 2 floppy-drive cable 2. Press inward on the two tabs on the sides of the drive, slide the drive upward, and remove it from the floppy-drive bay. 1 tab (2) 2 floppy drive Installing a Floppy Drive 1. If you are replacing a drive and the the new drive does not have the bracket rails attached, remove the rails from the old drive by removing the two screws that secure each rail to the drive.
1 drive 2 bracket rails (2) 3 screws (4) 2. Gently slide the drive into place until the tabs securely click into position. 3. Attach the power and floppy-drive cables to the floppy drive.
1 power cable 2 floppy-drive cable 4. If you are installing a new floppy drive rather than replacing a drive, remove the front-panel inserts. From inside the drive bay, gently press on each side of the insert until it pops out. 5. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents. 6. Close the computer cover. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 7.
1 power cable 2 CD/DVD drive cable 2. Press inward on the two tabs on the sides of the drive, and then slide the drive upward and remove it from the drive bay. 1 tab (2) 2 CD/DVD drive Installing a CD/DVD Drive 1. If you are installing a new drive, unpack the drive and prepare it for installation. Check the documentation that accompanied the drive to verify that the drive is configured for your computer. If you are installing an IDE drive, configure the drive for the cable select setting. 2.
3. If you are installing a replacement drive and the new drive does not have the bracket rails attached, remove the rails from the old drive by removing the two screws that secure each rail to the drive. Attach the bracket to the new drive by aligning the screw holes on the drive with the screw holes on the bracket rails and then inserting and tightening all four screws (two screws on each rail). 1 drive 2 bracket rails (2) 3 screws (4) 4.
1 power cable 2 audio cable (some drives do not have this cable) 3 CD/DVD drive cable 7. If you are installing a new CD/DVD drive rather than replacing a drive, remove the front-panel inserts. From inside the drive bay, gently press on each side of the insert until it pops out. 8. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents. 9. Close the computer cover.
Back to Contents Page VRM Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Installing a VRM Removing a VRM CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. NOTICE: A VRM must be installed to operate dual microprocessors.
for the Dell Precision 450 computer, see "Microprocessor Airflow Shroud — Dell Precision™ 450 Computer"). 6. Close the computer cover. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 7. Connect your computer and devices to electrical outlets, and turn them on.
Back to Contents Page Memory Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Memory Installation Guidelines Removing a Memory Module Adding a Memory Module CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. You can increase your computer memory by installing memory modules on the system board.
1 notch 2 memory module securing clips (2) 3 alignment keys Adding a Memory Module 1. Press out the securing clip at each end of the memory module connector. 2. Align the notch on the bottom of the module with the crossbar in the connector. 3. Insert the module into the connector, ensuring that it fits into the guides at each end of the connector. Carefully press each end of the module into place.
9. Open the computer cover and check the installed memory modules to ensure that they are seated properly in their sockets. Then repeat steps step 4 through step 7. 10. When the System Memory total is correct, press to exit system setup. 11. Run the Dell Diagnostics to verify that the memory modules are operating properly.
Back to Contents Page Microprocessor Airflow Shroud — Dell Precision™ 650 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the Microprocessor Airflow Shroud Installing the Microprocessor Airflow Shroud CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Removing the Microprocessor Airflow Shroud 1. Press down and back on the indentations at the top corners of the shroud.
Back to Contents Page Power Supply — Dell Precision™ 650 Computer Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the Power Supply Replacing the Power Supply CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. Removing the Power Supply NOTICE: Before disconnecting a device from the computer, wait 10 to 20 seconds after disconnecting the computer from its electrical outlet.
1 power supply 2 power-supply securing tab (5) 3 power-supply release button 5. Lift the power supply away from the computer. 6. Slide the power supply cables out of the computer (through the hole). Replacing the Power Supply 1. 2. Slide the power supply cables through the hole into the computer. Insert the power-supply securing tabs into the power-supply securing slot on the computer, ensuring that each securing tab is connected to its slot on the computer. 3.
Back to Contents Page System Board Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual Removing the System Board Replacing the System Board CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide. NOTICE: The system board and metal tray are connected and are removed as one piece. Removing the System Board 1. Remove any components that restrict access to the system board. 2.
5. Slide the system board assembly toward the back of the computer until the assembly clicks into position. 6. Replace any components and cables that you removed from the system board.
