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Removing sparcstation Internal Components

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					                     Removing SPARCstation 20
                     Internal Components                                                        2

Removing Power from the System
                     1. If your system is a server, notify other users that the system is going
                        down.

                     2. Back up system files and data.

                     3. Shut down the operating system.
                        Failure to shut down the operating system can result in loss of data.

                     4. Make sure that the power is turned off to the monitor and that all
                        peripherals are connected to the system.

                     5. Remove DC power from the system by pressing the Standby (           ) side of
                        the power switch on the back panel (Figure 2-1).
                        When the power is off, the LED on the right front of the system is not lit and
                        the fans are not running.

                     Note – After the power switch is pressed, it returns to its original position.




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         Power


                 Figure 2-1   SPARCstation 20 Power Switch


                 Caution – When the Power switch is set to Standby and the AC power cord
                 remains connected to a power outlet, hazardous AC voltage is still present in
                 the power supply primary.

                 Before servicing the power supply, you must first press the Standby switch and
                 then disconnect the AC power cord.

                 Leave the AC power cord connected when servicing any other system
                 component.

                 The power supply ‘remembers’ the state it was in when power was
                 interrupted. Press the Power switch to Standby before you disconnect a
                 working unit or connect a replacement unit. If the power supply is not placed
                 in standby before it is disconnected, it turns on automatically when it is
                 connected again, even if you do not touch the system power switch or
                 keyboard buttons.

                 6. Detach all cords and cables connected to the system unit except for the AC
                    power cord.
                    The AC power cord provides the grounding path for safely discharging
                    static electricity. Note where each cord and cable attaches to the system unit.




18               SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997
                                                                                               2

Removing the SPARCstation 20 Top Cover
                       1. Use a Phillips screwdriver to loosen the screw on the upper right corner of
                          the back panel (Figure 2-2).

                       Note – Do not loosen the screw near the power on/standby switch. This screw
                       holds the power supply in place.

                       2. Use a Phillips screwdriver to loosen the screw that secures the lock block
                          to the cover. Remove the lock block and corner screw, and put them aside
                          (Figure 2-2).


                Power supply screw        Lock block screw                               Corner screw
                (do not loosen)




                       Figure 2-2    SPARCstation 20 Lock Block Screw and Corner Screw




                       Removing SPARCstation 20 Internal Components                                19
     2
         3. Grasp the cover at the back of the machine, and lift it up toward the front
            of the unit. When the cover is at a 60-degree angle to the chassis, push the
            cover away from the front panel and free the cover hinge tabs from the
            chassis slots. Put the cover aside (Figure 2-3).




                                                                  Back of cover




         Figure 2-3   Removing the Cover




20       SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997
                                                                                                 2

Attaching the Wrist Strap
                       1. Locate the wrist strap and attach its adhesive copper strip to the metal
                          casing of the power supply. Wrap the other end twice around your wrist,
                          with the adhesive side against your skin (Figure 2-4).



                                                                      Wrist strap




                      Power supply




                       Figure 2-4   Grounding Wrist Strap to Power Supply

                            When used properly, a wrist strap keeps static electricity from building up
                            on your hands.




                       Removing SPARCstation 20 Internal Components                                   21
     2

Removing DIMMs
                 The SPARCstation 20 system supports up to eight DIMMs (dual inline memory
                 modules). DIMMs are available in three capacities:
                 •   16-Mbyte DIMMs
                 •   32-Mbyte DIMMs
                 •   64-Mbyte DIMMs

                 Caution – A DIMM is made of delicate electronic components that are
           !     extremely sensitive to static electricity. Handle a DIMM only by the edges.
                 Ordinary amounts of static from your clothes or work environment can
                 damage a DIMM.

                 Do not touch the components on the DIMM or any metal parts. Wear a
                 grounding strap before unpacking and while handling a DIMM.

                 Do not disconnect the power cord from the system unit back panel. The
                 power cord should also be connected to a grounded power outlet. This
                 connection provides the necessary ground path to safely remove and install
                 DIMMs and other components.

                 Be sure that the system unit power switch is set to Standby. Check the green
                 light-emitting diode (LED) at the front of the chassis to be sure it is not lit.

                 Each DIMM card has horizontally mounted chips on both sides. The part of the
                 card that connects in the memory slot has “gold fingers,” a scalloped edge with
                 a conductive surface.

                 Figure 2-5 and Figure 2-6 show front and back views of a DIMM. When
                 installed, the key notch should be near the DIMM ejector levers.




                                                                                 Key notch




                 Figure 2-5   DIMM— Front View




22               SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997
                                                                                        2



Key notch




            Figure 2-6   DIMM — Back View


            Caution – Surfaces are hot and can cause personal injury if touched.
            Avoid contact. If your system was operating before you opened it, heat sinks
            and other components may be hot and can cause personal injury if touched.

            1. Locate the slot for the DIMM that you need to remove (Figure 2-7).

            Note – VSIMMs, video memory modules, are not supported in Sun Ultra 30
            System systems, and should not be removed from the SPARCstation 20 system
            that you are upgrading.




                                                           DIMMs location

                                                                 J0201 bank 0
                                                                 J0202 bank 2
                                                                 J0203 bank 5
                                                                 J0301 bank 3
                                                                 J0302 bank 6
                                                                 J0303 bank 1
                                                  VSIMM 0, J0407 J0304* bank 7
                                                  VSIMM 1, J0406 J0305** bank 4

                                                  *J0304 can be used for VSIMMs or DIMMs,
                                                 **J0305 can be used for VSIMMs, DIMMs,
                                                   or an NVSIMM.


            Figure 2-7   DIMM Slot Locations on the SPARCstation 20 System Board




            Removing SPARCstation 20 Internal Components                                    23
     2
                2. Place an antistatic surface next to the system.

                3. Use your fingers or the eraser end of a pencil to move the ejection lever
                   away from the DIMM that you want to remove.
                   Ejection levers are greatly enlarged to show detail in Figure 2-8.




         DIMM                                                            DIMM




                                   Ejection levers


                Figure 2-8   DIMM Ejection Levers

                4. Grasp the upper corners of the DIMM and lift to remove it from the slot.

                5. Install the DIMM in the Sun Ultra 30 System.
                   See Sun Ultra 30 System Installation Guide for detailed instructions.

                Note – DIMMs in the Sun Ultra 30 System must be installed in matched pairs,
                having the same speed and capacity.

                For best performance, DIMMs in a Sun Ultra 30 System should be installed in
                groups of four. Each pair of DIMMs installed in a given bank of four must be
                of the same speed and capacity.




24              SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997
                                                                                                2

Removing the CD-ROM Drive
                     Note – Most SPARCstation 20 systems support 1-inch-high CD-ROM drives,
                     such as the SunCD 2Plus™, while some more recent systems support 1.6-inch-
                     high drives. The Sun Ultra 30 System only support 1.6-inch-high CD-ROM
                     drives.

                     1. Push the CD-ROM drive forward and slide it toward the outer edge of the
                        chassis to disengage it (Figure 2-9).

                 CD-ROM drive

                                                                                      DC power cable




              Chassis edge


                                                                    SCSI data cable




                     Figure 2-9   Removing the SunCD 2Plus Drive

                     2. Disconnect the SCSI data cable and DC power cable from the CD-ROM
                        drive (Figure 2-9.).
                        Leave the cables connected to the system board.

                     3. Lift the CD-ROM up and toward the chassis edge and remove it from the
                        chassis.




                     Removing SPARCstation 20 Internal Components                                      25
     2
         4. If the CD-ROM drive is a SunCD 2Plus (1”-high) drive, return it along
            with the SPARCstation 20 system.

         5. Install the CD-ROM drive in the Sun Ultra 30 System system.
            Refer to the Sun Ultra 30 System Installation Guide for detailed instructions
            about installing the CD-ROM drive in the Sun Ultra 30 System.




26       SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997
                                                                                            2

Replacing the Cover
                      1. Remove the wrist strap from your wrist and then from the power supply.

                      2. Grasp the cover by the front and rear edges (Figure 2-10).

                      3. Align the cover hinge tabs with the chassis tab slots on the bottom front
                         of the system. Make sure the tabs are locked into the chassis slots.

                      4. Lower the cover onto the chassis (Figure 2-10).



                                                                     Rear edge



                      Cover




                               Front edge


                      Figure 2-10 Replacing the SPARCstation 20 Cover




                      Removing SPARCstation 20 Internal Components                               27
     2
             5. Replace the lock block and use a Phillips screwdriver to tighten the screw
                that secures the lock block to the cover (Figure 2-11).




             Figure 2-11 Lock Block



         !   Caution – Do not use a power driver to tighten the back panel screws. Do
             not overtighten back panel screws.

             6. Use a Phillips screwdriver to tighten the screw on the corner of the back
                panel and secure the cover (Figure 2-12).



                                                                       Corner screw




             Figure 2-12 back panel Corner Screw




28           SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997
                                                                                           2

Returning the SPARCstation 20
                     Follow the instructions in the RMA documentation to repackage and return the
                     SPARCstation 20 system to Sun.




                     Removing SPARCstation 20 Internal Components                              29
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30       SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997

				
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