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6-4 Ultra Enterprise 6000/5000/4000 Systems Manual—November 1996
6
6.3.1 Troubleshooting a Peripheral Power Supply
A green LED is lit on the power supply when it is operational. When a
peripheral power supply fails, a yellow LED is lit on the power supply.
See Chapter 10, “Flow Diagrams for Troubleshooting,” for more information.
6.3.2 Replacing a Peripheral Power Supply
Caution – Remove and replace the peripheral power supply in a running
system (and not in the low power mode). In the low power mode, the front
panel and board LEDs are all off while the yellow LEDs are lit on the power
supplies.
Replacing the PPS during low power mode will cause the system to power up.
Caution – Be sure that onboard peripheral devices are not in use.
Note – While the peripheral power supply is removed:
• There is the loss of peripheral power.
• There is the loss of precharge (no hot-pluggable replacements are possible
except for the PPS).
• Onboard peripheral devices are not operational.
1. Mechanically 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 6-2.
Figure 6-2 Quarter-Turn Access Slot
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