Replacing A Pcm; Figure 7-7 Quarter-Turn Access Slots - Sun Microsystems Enterprise 3500 System Reference Manual

7.5.4

Replacing a PCM

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 – 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:
The peripheral power supply/AC (PPS0) must be fully operational (to provide
precharge current).
There must be a redundancy of electrical power (
1. Use the
2. Release the power supply from the system chassis by inserting a Phillips No. 1
screwdriver into each quarter-turn access slot and then turning to the unlocked
position (
FIGURE 7-7
3. Pull the end of the extraction lever outward to release the power supply from the
centerplane.
4. Pull out the power supply (
You see a message similar to the following example on your system console:
NOTICE: Core Power Supply 5 Removed
command to determine if precharge current is present.
prtdiag (1M)
).
FIGURE 7-7
Unlocked
Quarter-Turn Access Slots
FIGURE 7-8
TABLE 7-3
Locked
).
Chapter 7
) in the system.
Power Supplies 7-13