1 Preparation



This chapter covers the procedures and information you need to know before you begin installation or service on your 600MP system.

1.1 Tools and Test Equipment Required

The following tools and test equipment is required:

1.2 Field-Replaceable Units (FRUs)

Table 1-1 lists the part numbers for the field-replaceable units.

    Table 1-1 System and Expansion Memory Board Field Replaceable Units (FRU) 

-------------------------------------------------------------------------

                                          
Part Description                          Part Number
-------------------------------------------------------------------------


                                          
System board, 0MB and no modules          501-2055-xx
                                          
SM100 SPARC Module                        501-1388-xx
                                          
SM41 SPARC Module                         501-2258-xx, 501-2270-xx, and
                                          501-2359-xx
                                          
SM51 SPARC Module (single)                501-2352-xx and 501-2360-xx
                                          
MD514 dual SuperSPARC Module (single)     501-2444-xx and 501-2445-xx
                                          
MD512 SuperSPARC Module (single)          501-2352-xx and 501-2360-xx
                                          
0 MB Expansion Memory Board               501-1901-xx
                                          
4Mx9 80ns SIMM (system or memory board)   501-1739-xx
                                          
16Mx9 80ns SIMM (system or memory board)  501-2060-xx
                                          
2.10 Boot PROM Kit                        560-1912-xx
                                          
NVRAM/TOD                                 525-1181-xx
                                          
Fuses (system board, all same)            150-1383-xx

-------------------------------------------------------------------------

1.3 Shutting Down the System

Before turning off the system power, you must halt the operating system:

    1. Back up the system files and data to tape, if necessary.
    2. Go to the handbook that came with your peripheral to find this procedure.
    3. See the section about shutting down the system.
    4. Return to this book after you perform the procedure.

Caution -

Turn off the power at the main AC breaker before you insert or remove boards and disk drives. Do not disconnect the AC power cord from its receptacle.

1.4 Electrostatic Discharge Precautions

Caution -

Circuit board components are vulnerable to damage by electrostatic discharge (ESD). An electrostatic charge can build up on the human body and then discharge when you touch a board. Such discharge can be produced by walking across a carpet and touching a board, or by other similar causes. Before handling any board, make sure you dissipate your body's charge. Touch a conductive surface of the chassis or other element connected to common earth ground to discharge the static electricity present in your body. To minimize risk of ESD damage:

o Handle board by edges only.
o Store board in antistatic bag provided.

Use Sun ESD kit P/N 250-1088 (or equivalent) when working on the 600MP system board or the 600MP expansion memory board. Sun ESD kit P/N 250- 1088 contains the Sun approved Sun ESD mat which has 0.25" of cushioning to protect underside components, prevent board flexing, and provide ESD protection. Instructions for use are printed on the mat.

Do NOT use ESD kit P/N 560-1302 when installing SPARCsystem 600MP boards. ESD kit P/N 560-1302 does not provide adequate protection for SPARCsystem 600MP boards.

1.5 Slot Assignment Precautions

Before installing the 600MP expansion memory board, refer to the enclosure service manual for slot assignment information. These manuals are:

Manual Title 12-Slot Office Pedestal Service Manual (for SPARCsystem 670MP) 56" Data Center Cabinet Service Manual (for SPARCserver 690MP)

When you reconfigure the VMEbus boards in a system, you must consider the impact that change has on RFI emissions and thermal airflow. The following paragraphs describe materials and procedures that reduce RFI emissions, ensure proper airflow through the system, and protect the boards.

1.5.1 RFI Reduction

To reduce RFI emissions, Sun installs springfingers on VMEbus boards. Springfingers are metal strips that wrap around the edge of a board, behind its outer panel. Serrated metal "fingers" protrude from either side of the strip to contact the springfingers on adjacent boards. This provides a shield at the outer edges of all of the boards, which significantly reduces RFI emissions.

    Figure 1-1 Springfingers

Insulator strips are installed between the springfingers and the surface of the board. This thin strip of insulating material prevents a board's springfingers from shorting against the board itself. The strip is mounted to the board on two small pads.

    Figure 1-2 Insulator Strip

When a board is shipped, removable insulator shields are provided on all of its springfingers.

Shields provide electrical insulation between springfingers and adjacent boards. Board installation and removal information is printed on each shield.

    Figure 1-3 Insulator Shield

When you remove and replace boards that have springfingers, check the condition of the insulator strip. If it is damaged, replace it. The part number for the insulator strip is 330-1100-01. The insulator strip and insulator shield are included in kit number 560-1183-02. If you need to obtain additional insulator strips or insulator shields, call your Sun service hotline number.

The following figure illustrates the relative positions of the springfingers and insulators with respect to a board and the outer panel.

    Figure 1-4 Springfingers and Insulators

1.5.2 Installing Boards with Springfingers

If all boards in your system have springfingers, install the appropriate boards in alternate slots first (slots 1, 3, 5, etc.) then install the remaining boards (slots 2, 4, 6, etc.). If you attempt to install the boards sequentially, the springfingers push against each other and make it difficult to seat the last boards installed.

1.5.2.1 Installing Boards with Springfingers Next to Boards without Springfingers

Since not all VMEbus boards have springfingers, take special precautions when installing a board with springfingers next to a board that lacks springfingers.

Caution -

When you install a board with springfingers next to a board without springfingers, make sure that you install an insulator shield over the springfingers. If no insulator shield is installed, the springfingers can short against the active components on the next board and cause severe damage.

Note - Installation of a board without springfingers may increase RFI emissions and affect regulatory compliance. Sun is not responsible for regulatory compliance when boards without springfingers are added to a system that was originally shipped with springfingers.

When installing boards with springfingers next to boards without them, use the following guidelines:

1.5.3 Airflow

You must install air restrictor panels and filler panels in all slots that do not contain boards.

An air restrictor panel, as shown in Figure 1-5, is a blank panel with a special air deflector fin to simulate the airflow pattern of an actual board. If air restrictor panels are not installed in blank slots, a condition called a "thermal short" is created. Thermal shorts severely reduce the cooling capability of the system, which can lead to equipment damage.

Filler panels, as shown in Figure 1-5, are blank card backplates with springfingers that are installed in unused slots. Filler panels also affect airflow and can affect RFI emissions. Use the same guidelines to install filler panels with springfingers that you would use for VMEbus boards. (Refer to the preceding section for information about springfingers.)

    Figure 1-5 Air Restrictor Panel and Filler Panel

1.5.3.1 Installing a Filler Panel with Springfingers

This procedure is only for systems that have vertical backplanes. (This procedure does not work for systems that have horizontal backplanes such as a SPARCsystem 330.) In horizontal backplane systems, the air restrictor panel is vertical and cannot be pushed into place at the same time as the filler panel.

To install a filler panel equipped with springfingers in a system that has a vertical backplane:

    1. Pull out the air restrictor panel far enough to allow the springfingers to lay against the panel.
    2. Push both units into place simultaneously and fasten with the appropriate fasteners.

    Figure 1-6 Installing an Air Restrictor Panel and a Filler Panel

This procedure makes replacement of the filler panels easier and reduces the chance of damage to the springfingers in systems that have vertical backplanes.

1.5.4 SBus Cards and Springfingers

Caution -

If SBus cards are installed, make sure that the springfingers on the VMEbus board are not shorted against any ungrounded part of an SBus card. Shorting active components to the springfingers can cause severe damage to the SBus card and/or the system.

In some SBus card installations, the SBus cards are mounted very close to the springfingers. If the springfingers make contact only with a grounded connector shell on the SBus card, no insulator shield is required. Otherwise, make sure there is sufficient space between the springfingers and components on the SBus card. Remember that the springfingers may be compressed (that is, closer to the SBus card) when the board is installed. If there is any possibility of contact, install an insulating shield on the SBus card. A strip of insulating material and installation directions should be provided with the card.