4
Replacing the OpenBoot PROM



Removing and replacing the OpenBoot PROM in your system are required as part of upgrading the MBus module. This chapter gives the procedures for removing SBus cards, removing and replacing the OpenBoot PROM, and replacing SBus cards.

Removing the SBus Card(s) [Optional]

If SBus cards are installed in slots 0 and/or 1, they must be removed before the OpenBoot PROM can be physically accessed.

If SBus cards are installed in slots 0 and/or 1, follow the SBus card removal procedure below.

If SBus cards are not installed in slots 0 and/or 1, go directly to the OpenBoot PROM removal procedure later in this chapter.

    Figure 4-1 SBus Slots 0 and 1 on the Back Panel

    Figure 4-2 SBus Slots 0 and 1, Internal Locations

Note - Use a card extractor to remove an SBus card from the system board. If no extractor is available, pull up on the edge of the SBus card near the SBus connector.

    1. Unlock the retainers at the back edge of the SBus card.

    See Figure 4-3.

    Figure 4-3 SBus Card Retainers

    2. Remove the screws and washers from the SBus card backplate.

    See Figure 4-4. Save the screws and washers for later use.

    Figure 4-4 SBus Backplate Screws and Washers

    3. Insert the extractor into the SBus card.

    See Figure 4-5.

Note - If no card extractor is available, pull up on the edges of the card near the SBus connector to remove the SBus card from the slot.

    Figure 4-5 Installing the Card Extractor

    4. Hold both ends of the card extractor and pull upwards slowly until the connector is out of the slot.

Note - If no card extractor is available, pull up on the edges of the card near the SBus connector to remove the SBus card from the slot.

    5. Remove the card extractor from the SBus card:
      a. Bend one leg of the extractor slightly to the outside until the hook clears the hole in the SBus card.

      See Figure 4-6.

      b. Remove the other side of the extractor.

      It should come out easily without bending. See Figure 4-6.

    Figure 4-6 Removing the Extractor from the SBus Card

    6. Place the SBus card on an antistatic surface.

Removing the OpenBoot PROM

    1. Use an integrated-circuit extraction tool or a small flat-blade screwdriver, and carefully remove the OpenBoot PROM from its system board socket.

    See Figure 4-7 for the socket location.

    Figure 4-7 OpenBoot PROM and Socket Location

Installing the OpenBoot PROM

    1. Hold the new OpenBoot PROM by the edges. Match the notch on the OpenBoot PROM with the notch on the socket.

    See Figure 4-8. Do not touch the pins.

Caution -

Inserting the OpenBoot PROM backwards will damage it.

    Figure 4-8 Orientation of OpenBoot PROM

    2. Carefully align the pins and insert the OpenBoot PROM in the socket.

    Press down firmly until the pins are fitted in the socket.

Installing the SBus Card(s) [Optional]

    1. Open the rear card retainers on the system board.

    See Figure 4-9.

    Figure 4-9 Installing an SBus Card

    2. Slide the card at an angle into the back panel of the system and hook the card backplate under the lip on the back panel.

    Be sure the card backplate shows through the slots on the back panel.
    See Figure 4-9.

    3. Align the SBus card connector with the SBus slot on the system board. Gently press the corners of the card to fit the connector into the slot.

    See Figure 4-9.

Caution -

Forcing the card may damage the pins.

    4. Push the card retainers forward over the edge of the SBus card.

    See Figure 4-9.

    5. Reinstall screws and washers into the SBus card backplate.