3 Installing DSIMMs



This chapter tells how to install DSIMMs in a SPARCclassic, SPARCclassic X, or SPARCstation LX system. Be sure to perform the procedures in Chapter 2, "Preparations," before proceeding with the installation.

Caution -

DSIMMs installed in your system must be specifically designed to operate in it. Do not remove DSIMMs from a different Sun system and install them in a SPARCclassic, SPARCclassic X, or SPARCstation LX system.

Inserting a DSIMM

To install a DSIMM:

    1. Locate the DSIMM slots on the main logic board.

    Figure 3-1 DSIMM Slot Locations

    2. Make sure the wrist strap is securely attached to your wrist and to the metal casing of the power supply.
    3. Remove each DSIMM from its protective packaging and place it on an antistatic surface.

    The bag that the DSIMM is packed in makes a good antistatic surface.

    4. Determine where to install the new DSIMMs.

    See the configuration matrices shown in Table 3-1 and Table 3-2. Table 3-1 shows memory configurations for a SPARCclassic or SPARCstation LX system. Table 3-2 shows memory configurations for a SPARCclassic X terminal.

    To identify DSIMMs by part number, see Table 3-3.

Note - You may need to relocate existing DSIMMs to match one of the configurations shown.

Caution -

The six DSIMM slots are logically grouped into three memory banks - labeled 1, 2, and 3 (see Figure 3-1). When installing DSIMMs, you must make sure that the two DSIMM slots within each bank are identically configured (that is, both slots should contain the same type of DSIMM or else both should be empty). In addition, Memory Bank 1 (slots U0303 and U0304) must always have DSIMMs installed.

    Table 3-1 Memory Configuration Matrix - SPARCclassic and SPARCstation LX

    Table 3-2 Memory Configuration Matrix - SPARCclassic X Terminal

    Table 3-3 Identifying DSIMMs by Part Number

    5. Remove any DSIMMs that must be relocated.

    Each DSIMM is held in its slot by metal clips. To release a DSIMM, pry open the clips with your fingernails while pushing the top of the module gently forward about 30 degrees from the vertical position (see Figure 3-2). Then pull the DSIMM out of its socket and place it on the antistatic surface.

    Figure 3-2 Removing a DSIMM

Note - The DSIMMs are closely spaced. In order to remove a DSIMM, you may find it necessary to remove adjacent DSIMMs first. Keep track of which DSIMMs should be installed in which slots.

    6. Install the new DSIMMs and any others you may have removed.

    Since the DSIMMs are closely spaced, they must be installed in the proper order. Start with the slot closest to the center of the main logic board and work outward toward the board's front edge.

    Hold each DSIMM at its edges and insert it into the plastic guides at an angle about 30 degrees from the vertical position (see Figure 3-3). Then, by pushing gently on its top edge, rotate the DSIMM into an upright position. You should hear it click into place.

Note - Each DSIMM is keyed so it can only be installed in one way.

    Figure 3-3 Installing a DSIMM

Warning -

Before powering on your system again, be sure to close up the system unit as described in Chapter 5. It is not safe to operate the system with the system unit opened.

What's Next

Turn to Chapter 5, "Finishing Up," to complete the installation procedure.