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SGI 1400 Server Family Maintenance and Upgrades Guide
(document number: 007-3948-001 / published: 1999-07-22)    table of contents  |  additional info  |  download
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Chapter 2. Upgrading Baseboard Components

Use the information in this chapter to upgrade or replace components on the system baseboard (processor board). For information on tools needed, see Chapterá1. For a list of safety related information see “Safety: Before You Remove the Access Cover”.

For a complete list of warnings and cautions regarding internal power, ESD, and proper system cooling, be sure to read “Warnings and Cautions” in Chapterá1.


Caution: Installing or removing jumpers: A jumper is a small, plastic-encased conductor that slips over two jumper pins. Newer jumpers have a small tab on top that you can grip with your fingertips or with a pair of fine, needle-nosed pliers. If your jumpers do not have such a tab, take care when using needle-nosed pliers to remove or install a jumper; grip the narrow sides of the jumper with the pliers, never the wide sides. Gripping the wide sides can damage the contacts inside the jumper, causing intermittent problems with the function controlled by that jumper. Take care to gently grip, but not squeeze, with the pliers or other tool you use to remove a jumper; you might bend or break the stake pins on the board.


Baseboard

Use the information in the following sections to remove or install the baseboard.

Removing the Baseboard


Caution: The baseboard can be extremely sensitive to ESD and always requires careful handling. After removing it from the system, place it component–side UP on a nonconductive, static-free surface to prevent shorting out the battery leads. If you place the board on a conductive surface, the battery leads may short out. This will result in a loss of CMOS data and will drain the battery. Do not slide the baseboard over any surface.


  1. Observe the safety and ESD precautions at the beginning of this chapter.

  2. Remove the access cover.

  3. Remove the front and rear foam covers.

  4. Label and disconnect all internal cables connected to add-in boards.

  5. Remove all add-in boards.

  6. Label and disconnect all internal cables connected to the baseboard.


Note: The baseboard is attached to the electronics bay. In general, the best method for removing the baseboard is to remove the electronics bay first, particularly in servers mounted in a pedestal (tower) orientation, though this is not a requirement.


  1. Open the front subchassis and, if necessary, remove the electronics bay.

  2. Remove the processors and processor retention module.

  3. Remove and save the two screws that secure the baseboard to the chassis.

  4. Slide the baseboard toward the front of the server until the board's I/O connectors clear the rear of the chassis.

  5. See Figureá2-1 for an example of removing the baseboard.

    • The edge of the baseboard at the TOP of the figure (NEAREST and parallel to the ISA slot) fits into a groove along the edge of the chassis.

    • The edge at the BOTTOM of the figure (OPPOSITE and parallel to the ISA slot) is free.

  6. Place your fingers under the edge of the baseboard OPPOSITE the ISA slot (the edge at the bottom). Lift the edge a few inches.

  7. Slide the baseboard out, toward the edge you just lifted. This will free the opposite edge (nearest the ISA slot) from the groove that secures it to the chassis.

  8. Remove the baseboard and place it component–side up on a nonconductive, static-free surface or in an antistatic bag.

  9. Remove and save the EMI gasket that covers the I/O connectors on the board.

    Figure 2-1. Removing the Baseboard


Installing the Baseboard

  1. Observe the safety and ESD precautions at the beginning of this chapter.

  2. Place the EMI gasket over the I/O connectors on the baseboard.

  3. Position the board over the two snap-in standoffs and threaded standoffs inside the chassis; slide it carefully toward the rear of the system until the I/O connectors protrude through the back panel.

  4. Press the board onto the snap-in standoffs, then insert one screw through one of the mounting holes of the board and into a threaded standoff. Do not tighten the screw until the next step.

  5. Insert the remaining screws through the mounting holes and into the threaded standoffs. Make sure the board is properly seated, then tighten all the screws firmly (6.0 inch-pounds).

  6. Connect all internal cables to the baseboard.

  7. Reinstall the add-in boards as applicable.

  8. Connect all internal cables to add-in boards.

  9. Reinstall the electronics bay if you removed it and close the front subchassis.

  10. Reinstall the front and rear foam covers.

  11. Reinstall the access cover using the original screws.

  12. Connect all peripheral device cables to the I/O panel on the rear of the system.

  13. Run the SSU to configure the system.

Memory

Use the following sections to remove or install the memory module or DIMMs.

Removing the Memory Module


Note: Make sure you run the SSU to configure ECC memory. Failure to do so might degrade the performance of the server.

See the SGI 1400 Server Family User's Guide if you need more information on memory size and requirements. Use the following steps to remove a memory module:

  1. Read and observe all safety and ESD precautions listed at the beginning of Chapterá1.

  2. Remove the access cover.

  3. Remove the rear foam cover over the electronics bay. It might be easier to do this if you also remove the front foam cover over the front subchassis, see Figureá2-2.

  4. Remove the memory module from the baseboard:

    • Pull the module toward you slightly to disengage it from the baseboard connector.

    • Slide the module straight away from the baseboard until it clears the guide rails.

    • Place the module component-side up on a nonconductive, static-free surface.

      Figure 2-2. Removing the Memory Module


Installing the Memory Module

Use the following steps to install or replace a memory module:

  1. Observe the safety and ESD precautions at the beginning of this chapter.

  2. Holding the memory module by its edges, align the module so its edge engages in the guide rail at the back of the electronics bay.


    Note: The memory module is held in place by the 242-pin connector on the baseboard, the guide rail at the back of the electronics bay, and a plastic guide at the front of the electronics bay. You must support the module until it is fully seated in the connector.


  3. Push the memory module toward the baseboard until it fully engages its connector.

Removing DIMMs


Caution: Use extreme care when removing a DIMM. Too much pressure can damage the socket slot. Apply only enough pressure on the plastic ejector levers to release the DIMM.


  1. Observe the safety and ESD precautions at the beginning of this chapter.

  2. Remove the memory module and place it component-side up on a nonconductive, static-free surface (see “Removing the Memory Module” if you have not yet done this).

  3. Gently push the plastic ejector levers out and down to eject a DIMM from its socket.

  4. Hold the DIMM only by its edges, being careful not to touch its components or gold edge connectors. Carefully lift it away from the socket and store it in an antistatic package.

  5. Repeat to remove other DIMMs as necessary.

    • If you are REPLACING DIMMs, proceed to “Installing DIMMs”.

    • If you are simply REMOVING DIMMs, continue the procedure with the following steps.

  6. Reinstall the memory module.

  7. Reinstall the foam cover(s).

  8. Connect all external cables and power cords to the system.

  9. Reinstall the access cover using the original screws.

  10. Turn on the monitor and then the system.

  11. Run the SSU/BIOS Setup to configure the system and to properly set up advanced memory attributes as required.

Installing DIMMs

DIMMs are keyed and can be inserted in only one way.


Caution: Use extreme care when installing a DIMM. Applying too much pressure can damage the socket. Mixing dissimilar metals might cause memory failures later, resulting in data corruption. Install DIMMs with gold-plated edge connectors only in gold–plated sockets.



Note: DIMM slots on the memory module must be installed only in certain configurations. See the SGI 1400 Server Family User's Guide if you are uncertain of the configuration requirements. Use the following steps to install new DIMMs:


  1. Holding the DIMM only by its edges, remove it from its antistatic package.

  2. Orient the DIMM so that the two notches in the bottom edge of the DIMM align with the keyed socket on the memory module.

  3. Insert the bottom edge of the DIMM into the socket, then press down firmly on the DIMM until it seats correctly.

  4. Gently push the plastic ejector levers on the socket ends to the upright position.

  5. Repeat the steps to install each DIMM.

  6. Reinstall the memory module.

  7. Reinstall the foam cover(s).

  8. Reinstall the access cover using the original screws.

  9. Connect all external cables and the power cords to the system.

  10. Turn on the monitor and then the system.

  11. Run the SSU to configure the system and to properly attribute ECC memory.

    Figure 2-3. Installing a DIMM


Processors

Use the information in the following sections to remove or install a processor in the server system.


Caution: Processor must be appropriate: You might damage the system if you install a processor that is inappropriate for your system. Make sure your system can handle a newer, faster processor (thermal and power considerations). For exact information about processor interchangeability, contact your customer service representative.

Reduce the risk of electrostatic discharge (ESD) damage to the processor by doing the following:

  • Touch the metal chassis before touching the processor or baseboard.

  • Keep part of your body in contact with the metal chassis to dissipate the static charge while handling the processor.

  • Avoid moving around unnecessarily.

Removing a Processor

  1. Observe the safety and ESD precautions at the beginning of Chapterá1 and the additional cautions given here.

  2. Remove the access cover and the rear foam cover over the electronics bay.

  3. As you work, place processors on a grounded, static-free surface or conductive foam pad.

  4. With your right thumb on the face of the retention module bracket, wrap your right index finger around the tab protruding from the right edge of the bracket. See Figureá2-4 for an example.

  5. Use your index finger to slightly pull the tab outward and to the left. You should not try to pull the entire bracket; rather, the back of the tab has a latch that releases when the TAB is pulled slightly.

  6. When you have released the right edge of the bracket, rotate it 90░ to the left until it is perpendicular to the front of the retention module. The left edge of the bracket has an open hinge that can release from the module when you rotate the bracket to the left.

  7. Disengage the open hinge by moving (not rotating) the entire bracket to the right. Remove the bracket and set it aside.

  8. Pull the two tabs attached to the S.E.C. cartridge (see Figureá2-5) straight away from the baseboard. As you do, the cartridge disengages from its connector on the baseboard.

  9. Slide the S.E.C. cartridge straight away from the baseboard, out of the retention module. Put it on a piece of conductive foam and store it in an antistatic package.

    Figure 2-4. Releasing the Retention Module Bracket


Components shown in Figureá2-4 are:

  1. Retention module bracket

  2. Bracket tab

  3. Latch

    Figure 2-5. Removing a Processor


Components shown in Figureá2-5 are:

  1. An S.E.C. cartridge

  2. Retention module guide rails

  3. Tabs on the S.E.C. cartridge

  4. Processor heat sink

Installing a Processor

Use Figureá2-6 and the following steps when installing a new or additional processor.


Note: If your system has less than four processors and you are adding one, then you must remove the termination board in the empty Slot 2 connector. The procedure for removing a termination board is the same as for removing a processor.

If you plan to reduce the number of processors in your system, then you must replace a processor with a termination board. The procedure for installing a termination board is the same for installing a processor.

  1. Read and observe all the safety and ESD precautions at the beginning of Chapterá1.

  2. Remove the new processor from its antistatic package and place it on a grounded, static-free surface or conductive foam pad.

  3. Orient the S.E.C. cartridge so that the heat sink faces away from the center of the baseboard.

    If you are installing a termination board, orient it so that the side with the white bar-code label faces away from the center of the baseboard.

  4. With the tabs at the top of the S.E.C. cartridge completely open (pulled outward, away from the center of the cartridge), slide the cartridge into the guide rails of the retention module. When done properly, the triangular ends of the tabs (with two round pegs on each) fit into the entrance to the guide rails.

  5. When the cartridge meets resistance, push the two tabs toward each other until the processor is fully seated.

  6. Reattach the retention module bracket:

    • With the bracket in an open position (perpendicular to the front of the retention module), slide the open hinge at the left of the bracket into its receptacle at the left of the retention module.

    • Rotate the bracket to the right until it reaches the retention module. With your right thumb on the face of the bracket and your right index finger around the tab at the right of the bracket, slightly pull the tab outward and to the left to open the latch at the back of the tab.

    • As you open the latch on the back of the tab, slide the right edge of the bracket onto the retention module and release the tab. If done correctly, the bracket will be securely latched.

  7. Reinstall the foam cover.

  8. Reinstall the access cover using the original screws.

    Figure 2-6. Installing a Processor


Figureá2-6 shows the following components:

  1. S.E.C cartridge

  2. Retention module guide rails

  3. Tabs on the S.E.C. cartridge

  4. Processor heat sink (must face away from center of baseboard)

Installing the Processor Tabs

Depending on your configuration, the tabs for the processor's S.E.C. cartridge might not be attached to the cartridge. In this case, you must attach two tabs to each S.E.C. cartridge as directed in the following steps:

  1. Orient the tab as shown in Figureá2-7.

  2. Two small round pegs at the center of the tab correspond with two round holes at each corner of the S.E.C. cartridge, see Figureá2-7. Spread the tab open slightly to get the pegs into the holes, being careful not to use too much force and break the tab.

    If done properly, the tab will rotate freely with its axis near the center of the tab, at the base of the triangular section.

  3. Repeat to install the second tab to the S.E.C. cartridge.

    Figure 2-7. Installing Tabs on a Processor S.E.C. Cartridge


Installing Processor Heatsinks

Depending on your configuration, the heatsink for each processor's S.E.C. cartridge might not be attached to the cartridge. In this case, you must attach one heatsink to each S.E.C. cartridge. Use Figureá2-8 and the following steps:

  1. Remove the heatsink from its protective cover.

  2. Pull the tab on the bottom of the heatsink to remove the plastic film and expose the square of adhesive thermal grease that will help attach the heatsink to the S.E.C. cartridge. This square is offset, so that more of it is on one side of the center screw hole than on the other side. This offset side (see Figureá2-8) must point toward the connector end of the S.E.C. cartridge.

  3. Orient the heatsink on the silver metal side of the processor so that:

    • The side with more of the grease square points toward the S.E.C. cartridge connector

    • The side with less of the grease square points toward the processor tabs

    • All five screw holes align correctly with the holes in the S.E.C. cartridge

  4. Because of the adhesive grease on the heatsink, be careful to orient the heatsink properly before placing it against the S.E.C. cartridge.

  5. Attach the heatsink to the S.E.C. cartridge with five 6-32 x 1/4 screws, and tighten to 8-10 inch-pounds.

    Figure 2-8. Installing a Heatsink on a Processor S.E.C. Cartridge


The locations shown in Figureá2-8 are:

  1. Processor S.E.C. Cartridge

  2. Processor Connector

  3. The heatsink edge that goes TOWARD the connector on the S.E.C. cartridge (the grease square is off-centered toward this edge)

  4. Screw hole (five total attach the heatsink to a cartridge)

  5. Example screw

  6. Grease square (adhesive film must be removed before mounting)

  7. Center screw hole: note that the grease square is off-centered from this screw hole toward the edge (as indicated in callout 3)

Voltage Regulator Modules (VRMs)

Up to six voltage regulator modules provide power for processors. Every processor requires 1.5 VRMs, so with four processors, you must use six VRMs. Tableá2-1 shows this relationship.

You must use a specific number and connector population sequence of VRMs for each combination of processors and termination boards. Tableá2-2 lists the required number and location of VRMs for each potential processor. Figureá2-9 shows this information graphically.

Table 2-1. VRM and Processor Power Sequence

VRM #

VRM provides power for

Description

1

Processor #1

Processor core power only

2

Processor #1 and #2

L2 cache power only

3

Processor #2

Processor core power only

4

Processor #3

Processor core power only

5

Processor #3 and #4

L2 cache power only

6

Processor #4

Processor core power only


Table 2-2. Processor and VRM Population Sequencing

If you have a processor in connector #

You must have a VRM in connector #

1

1 and 2

1 and 2

1, 2, and 3

1, 2, and 3

1, 2, 3, 4 and 5

1, 2, 3, and 4

1, 2, 3, 4, 5, and 6

Figure 2-9. Processor and Corresponding VRM Locations


Components listed in Figureá2-9 are:

  1. Processor connector #4

  2. Processor connector #3

  3. Processor connector #2

  4. Processor connector #1

  5. VRM connector #6 (used for processor #4)

  6. VRM connector #5 (used for processors #3 and #4)

  7. VRM connector #4 (used for processor #3)

  8. VRM connector #3 (used for processor #2)

  9. VRM connector #2 (used for processors #2 and #1)

  10. VRM connector #1 (used for processor #1)

Removing a VRM

Use the following information and steps when removing a VRM.


Caution: VRM must be appropriate: You might damage the system if you install a VRM that is inappropriate for your system. For exact information about VRM and processor interchangeability, contact your customer service representative.



Note: Reduce the risk of electrostatic discharge (ESD) damage to the VRM by doing the following:


  • Touch the metal chassis before touching the VRM or baseboard.

  • Keep part of your body in contact with the metal chassis to dissipate the static charge while handling the VRM.

  • Avoid moving around unnecessarily.

  1. Read and observe the safety and ESD precautions at the beginning of Chapterá1 and the additional cautions given here.

  2. Remove the access cover and the rear foam cover over the electronics bay.

  3. As you work, place VRMs on a grounded, static-free surface or conductive foam pad.

  4. Using a small flat-bladed screwdriver, push the plastic ejector levers on each end of the connector away from the VRM to eject it out of the connector.

  5. Place the VRM on a nonconductive, static-free surface, or store it in an antistatic protective wrapper.

Installing a VRM

Use Figureá2-10 and the following steps to install a VRM on the system baseboard:

  1. Read and observe the ESD and other warnings listed in the previous section “Removing a VRM”.

  2. Remove the VRM from its protective package.

  3. Carefully insert the VRM in the connector on the baseboard. See Figureá2-10 for an example.


    Note: Make sure you do not bend the connector pins.


  4. Push down firmly on both ends of the VRM until the ejector levers of the connector snap into place, locking the VRM in the connector.

  5. Reinstall the rear foam cover over the electronics bay.

  6. Reinstall the access cover using the original screws.

    Figure 2-10. Installing a VRM


The components shown in Figureá2-10 are:

  1. VRM connector on baseboard

  2. VRM

  3. Ejector lever

Replacing the Backup Battery

The lithium battery on the baseboard (Figureá2-11) powers the real-time clock (RTC) for three to four years in the absence of power. When the battery weakens, it loses voltage and the system settings stored in CMOS RAM in the RTC (e.g., the date and time) may be wrong. Contact your customer service representative or dealer for a list of approved devices.


Warning: If the system has been running, any installed processor and heat sink on the processor board(s) will be hot. To avoid the possibility of a burn, be careful when removing or installing baseboard components that are located near processors.

The following warning and translations of the warning are required by specific certifying agencies to be printed immediately adjacent to the procedure for removing the RTC.


Warning: There is a danger of explosion if the battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the equipment manufacturer. Discard used batteries according to manufacturer's instructions.

Figure 2-11. Replacing the Lithium Battery


  1. Observe all the safety and ESD precautions at the beginning of Chapterá1 as well as the warnings given at the beginning of this section.

  2. Remove the access cover.

  3. Insert the tip of a small flat-bladed screwdriver or equivalent under the plastic tab on the snap-on plastic retainer.

  4. Gently push down on the screwdriver to lift the battery.

  5. Remove the battery from its socket.

  6. Dispose of the battery according to local ordinance.

  7. Remove the new lithium battery from its package and, being careful to observe the correct polarity, insert it in the battery socket.

  8. Reinstall the plastic retainer on the lithium battery socket.

  9. Reinstall the access cover using the original screws.

  10. Run the SSU to restore the configuration settings to the RTC.

SGI 1400 Server Family Maintenance and Upgrades Guide
(document number: 007-3948-001 / published: 1999-07-22)    table of contents  |  additional info  |  download

    Front Matter
    About This Guide
    Chapter 1. Working Inside the System
    Chapter 2. Upgrading Baseboard Components
    Chapter 3. SGI 1400 Server SCSI Backplane Installation
    Chapter 4. Technical Reference
    Appendix A. Equipment Log and Configuration Worksheets
    Appendix B. Environmental Specifications
    Appendix C. Chassis Warnings and Safety
    Index


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