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
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.
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
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
6. Detach all cords and cables connected to the system unit except for the AC
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
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
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
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
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).
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
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.
Figure 2-5 DIMM— Front View
22 SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997
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.
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. 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.
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
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
1. Push the CD-ROM drive forward and slide it toward the outer edge of the
chassis to disengage it (Figure 2-9).
DC power cable
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
Removing SPARCstation 20 Internal Components 25
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
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).
Figure 2-10 Replacing the SPARCstation 20 Cover
Removing SPARCstation 20 Internal Components 27
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).
Figure 2-12 back panel Corner Screw
28 SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997
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
30 SPARCstation 20 to Sun Ultra 30 System Upgrade Guide—May 1997