Power control card LED - (NF 8500R - Type 8681)

Power control card LED

The power control card LED is located in the center of the system, between the processors and the midplane.
On the power control card is an LED that provides status of the card based on its flash rate.
To view the LED, look through the hole in the left side of the chassis.

With AC power applied to the power supplies, the following conditions may be indicated by the power control card LED:

1.  Slow flash rate (approximately 1 flash per second) - the power control card is functioning properly.
2.  No flashing LED - Power control card is not operational. Replace the power control card.
3.  Fast flash rate (approximately 2 flashes per second) - the system has a 240VA fault, which will shut down  the system, indicating a possible processor failure or a short in a system component.

1.  Leave the AC power applied.
2.  Connect to the service processor and view the system error log, looking for a power failure message  on one or more of the power planes.
    If a power failure message is posted, refer to the following table and proceed as indicated.

Power Fault Message in	Failing FRU/Action
the System Error Log
3.3V bus A	1. Disconnect AC power.
(power to the memory	2. Reduce memory to one memory carrier and one memory DIMM.
complex)	3. Reconnect AC power and wait about 30 seconds for the system
	management adapter to initialize.
	4. Attempt to start the system.
	5. If the system starts, one of the FRUs removed is the failing FRU.
	Reinstall one FRU at a time to identify the failing FRU.
	6. If the system does not start, suspect remaining system FRUs
	in the following order:
	a. Memory DIMM
	b. Memory carrier
	c. Midplane
	d. Power supply
3.3V bus B	1. Disconnect AC power.
(power to I/O board and	2. Reduce the system to one processor daughterboard with
CPU complex)	one processor.
	3. Remove the cache coherency filter DIMMs.
	4. Remove all PCI adapters except the I\O function card
	and the system management adapter.
	5. Reconnect the AC power and wait about 30 seconds for the
	system management adapter to initialize.
	6. Attempt to start the system. If the system starts, one
	of the FRUs removed is the failing FRU.
	Reinstall the FRUs one at a time to identify the failing FRU.
	7. If the system does not start, suspect remaining system FRUs
	in the following order:
	a. I/O Planar
	b. Processor
	c. Processor daughter card
	d. Processor controller board
	e. Midplane
	f. Power supply
5V bus A	1. Remove AC power.
(Power to PCI, I/O, NIO and	2. Reduce the system to one processor daughter board with
CPU complex)	one processor.
	3. Remove the cache coherency filter DIMMs.
	4. Remove all PCI adapters except the I\O function card and
	the system management adapter.
	5. Reconnect the AC power and wait about 30 seconds for the
	system management adapter to initialize.
	6. Attempt to start the system. If the system starts, one
	of the FRUs removed is the failing FRU.
	Reinstall the FRUs one at a time to identify the failing FRU.
	7. If the system does not start, suspect remaining system FRUs
	in the following order:
	a. Hotswap sense card
	b. I/O function card
	c. System management adapter
	d. I/O board
	e. Processor
	f. Processor daughter board
	g. Processor board
	h. Power control card
	i. Midplane
	j. Power supply
5V bus B	1. Disconnect AC power.
(power to PCI slots and	2. Remove all internal SCSI devices (DASD or Tape drives).
SCSI devices)	3. Remove the SCSI backplane.
	4. Remove all PCI adapters except the I\O function card and
	the system management adapter.
	5. Reconnect the AC power and wait about 30 seconds for the
	system management adapter to initialize.
	6. Attempt to start the system. If the system starts, one
	of the FRUs removed is the failing FRU.
	Reinstall the FRUs one at a time to identify the failing FRU.
	7. If the system does not start, suspect remaining system FRUs
	in the following order:
	a. I/O Function card
	b. System management adapter
	c. I/O board
	d. Power control card
	e. Midplane
	f. Power supply
12V bus A	1. Disconnect AC power.
(power to PCI slots)	2. Remove all PCI adapters except the I\O function card and
	the system management adapter.
	3. Reconnect the AC power and wait about 30 seconds for the
	system management adapter to initialize.
	4. Attempt to start the system. If the system starts, one
	of the FRUs removed is the failing FRU.
	Reinstall the FRUs one at a time to identify the failing FRU.
	5. If the system does not start, suspect FRUs
	in the following order:
	a. I/O Function card
	b. System management adapter
	c. I/O board
	d. Midplane
	e. Power supply
12V bus B	1. Disconnect AC power.
(power to media devices	2. Remove all internal media devices (DASD, CD-ROM, tape, and
and I/O fans)	floppy drives).
	3. Remove the SCSI backplane.
	4. Remove all the I/O fans (4, 5, and 6)
	5. Reconnect the AC power and wait about 30 seconds for the
	system management adapter to initialize.
	6. Attempt to start the system. If the system starts, one
	of the FRUs removed is the failing FRU.
	Reinstall the FRUs one at a time to identify the failing FRU.
	7. If the system does not start, suspect FRUs
	in the following order:
	a. Midplane
	b. Power control card
	c. Power supply

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