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Sun Enterprise 3500 System Reference Manual

Replacing a PCM

Caution - Caution -

Do not replace a PCM while the system is in the low power mode. Remove and replace the PCM only in a running system. Replacing a PCM during low power mode will cause the system to power up immediately and result in a severe overload condition for that PCM (the other PCMs will remain in the low power mode). The system is in the low power mode if the front panel and board LEDs are all off while the yellow LEDs are lit on the power supplies.

Caution - Caution -

Replace the PCM immediately or risk overheating the board(s) cooled by the fans in that power supply.

Remember the following rules for hot-plug replacement of a PCM:

  1. Use the prtdiag (1M) command to determine if precharge current is present.

  2. Release the power supply from the system chassis by inserting a Phillips #1 screwdriver into each quarter-turn access slot and then turning to the unlocked position. See Figure 7-7.

    Figure 7-7 Quarter-turn Access Slots

    Graphic

  3. Pull the end of the extraction lever outward to release the power supply from the centerplane.

  4. Pull out the power supply. See Figure 7-8.

    You will see a message similar to the following example on your system console: 

    NOTICE: Core Power Supply 5 Removed

    Figure 7-8 Replacing a PCM in the Enterprise 3500 System

    Graphic

  5. Carefully insert the replacement power supply in the proper slot.

    1. Orient the PCM with the extraction lever on the outside edge of the Enterprise 3500 system.

    2. Verify that the arrows in the quarter-turn access slots are turned to the unlocked position.

    3. Ensure that the extraction lever is in the outward, unlocked position.

      The power supply will not seat fully unless the lever is in the unlocked position.

      Caution - Caution -

      DO NOT FORCE the power supply into a slot. This can cause damage to the power supply and system.

      The power supply should insert and seat smoothly. If it binds, remove it, and inspect the slot for any obvious obstructions. Do not damage the springfingers at the bottom of the power supply.

  6. Slide the power supply toward the centerplane, then use the extraction lever to seat the power supply. See Figure 7-8.

    Swing the lever inward to the locked position. Do not press on the front panel of the power supply to seat it--doing so will damage the connector pins.

  7. Lock the power supply to the system chassis by inserting a Phillips #1 screwdriver into each quarter-turn access slot and then turning to the locked position. See Figure 7-7.

  8. Check to be sure the green LED on the PCM is lit.

    If the green LED is not lit, the power supply is not seated properly. Repeat Step 5 to Step 8. If the green LED is still not lit, see Table 10-6 for more information.

    If the green LED is lit, you will see a message similar to the following example on your system console: 

    NOTICE: Core Power Supply 5 Installed
NOTICE: Core Power Supply 5 OK
NOTICE: Redundant power available